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Biochemistry Flashcards

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4703526937What are the two amino acid functional groups?amino group (NH2) carboxyl group (COOH)0
4703533528chiral centershave four different groups attached to it, are optically active All a.a.'s are chiral except one1
4703534357what is unique about glycine?a achiral molecule, has an hydrogen molecule as the R-group and is the only amino acid that isn't chiral, doesnt have an (S) or (R) configuration2
4703539758D-amino acidsenantiomers of the amino acid that has amino group on the right3
4703554413What is unique about Cysteine?only amino acid that doesn't have (S) configuration (like all other a.a.) b/c it has an R-group that has higher priority than carboxyl group it has a (R) configuration instead4
4703539757L-amino acidsenantiomers of the amino acid that has amino group on the left only L-a.a. are used by cells5
4703556203Nonpolar, nonaromatic side chains amino acids (7) HydrohphobicGlycine, Gly, G Alanine, Ala, A Valine, Val, V Leucine, Leu, L Isoleucine, Ile, I Methionine, Met, M Proline, Pro, P6
4703556623nonpolar, aromatic side chains amino acids (3) Hydrohphobictryptophan, Trp, W phenylalanine, Phe, F tyrosine, Tyr, Y7
4703557040polar side chains amino acids (5) Hydrohphilicserine, Ser, S threonine, Thr, T asparagine, Asn, N glutamine, Gln, Q cysteine, Cys, C8
4703585559Negatively charged acidic side chains (2) Hydrohphilicaspartate, Asp, D glutamate, Glu, E9
4703586232Positively charged basic side chains (3) Hydrohphiliclysine, lys, L arginine, Arg, R histidine, His, H10
4705665918Absolute configuration3D model of the arrangement of atoms11
4705673978amphoteric speciesAmino acids are this because they can either accept or donate a proton. it helps form micelles and phospholipid bilayers b/c it has hydrophilic and hydrophobic regions12
4705675336The behavior of amino acids is based onpH at low pH (acidic), ionizable groups tend to be protonated ; at high pH (basic), ionizable groups tend to be deprotonated if the pH is less than the pKa, it will be protonated if the pH is higher than the pKa, it will be depronated13
4707248684Bronstead lowry baseproton acceptor14
4707248685Bronstead lowry acidproton donor15
4707254624lewis acidelectron pair acceptor16
4707254698lewis baseelectron pair donor17
4707289363Lewis bases and Bronstead Lowry bases are the same in a reaction becausea proton acceptor is the same as an electron pair acceptor18
4707291569Is the Lewis Base an electrophile or nucleophileNucleophile19
4707420731pKa equation henderson equationpKa = -logKa pH = pka + log [A] base/[HA] acid20
4707421848A strong acid has a ____ Ka value, a ___ pka value equilibrium lies to the ____high, low, right21
4707443477Nucleophiles are negative or positive?negative22
5772267782Alkaline pH valueBasic pH23
5772267783Isoelectric point (pI)pH where the molecule is electrically neutral pI = (pka1 + pka2) / 224
5772267784Peptide bond formationCondensation/dehydration reaction The carboxyl 'OH' and amino 'H' form water25
5772267785Peptide bond breakageHydrolysis reaction Add an 'H' to amide Nitrogen and an 'OH' to the carbonyl carbon26
5832913182Hydrolysisadds water to break C-N bond Carbonyl side gets -OH, forming a carb acid Nitrogen picks up an -H, forming an amine27
5772267786GlobularSpherical (globe) shaped proteins Ex: myoglobin Caused by tertiary and quaternary structures folding28
5772267787FibrousLong strand (sheet-like) proteins Ex: collagen29
5783494099When an hydrophobic a.a. dissolves it can't form ___, entropy ____ and is unfavorable delta G is ____h-bonds, decreases, is greater than zero30
5772267788LiproproteinsProteins with lipids31
5772267789GlycoproteinsProteins with carbohydrate32
5772267790NucleoproteinsProteins with nucleic acids33
5772267791Prosthetic group on hemeglobinsHeme34
5772267792Prosthetic groups areCoenzymes and cofactors35
5772267793CofactorsMetal ions, inorganic molecules, minerals36
5772267794CoenzymesVitamins (FAD, NAD+, CoA) and organic molecules37
5772267795The graph of a molecule that follows Michealis menten isHyperbolic38
5772267796OxidoreductasesEnzyme that catalyze redox39
5772267797TransferaseEnzyme that catalyze movement of functional group40
5772267798HydrolaseEnzyme that catalyze breakdown of molecules using water41
5772267799LyasesEnzyme that catalyze cleavage of molecules without water42
5772267800IsomeraseEnzyme that catalyze rearrangement of bonds in a molecule43
5772267801LigasesEnzyme that catalyze addition b/w large and similar molecules44
5772267802HaloenzymesEnzymes that are bounded to cofactor45
5772267803ApoenzymesEnzymes that are not bounded to cofactors46
5772267804ZymogensControl enzymes by being the in the inactive form of enzymes47
5783495137What do enzymes dohelp reach the transition state easier by lowering the activation energy48
5783495651induced fitthe enzyme's shape is changeable and changes in order to fit the substrates unique shape49
5783498263Vmaxit is the max velocity of a reaction; the saturation point of enzymes50
5783498756When does Km = [S]when the reaction is at half the Vmax51
5783499302The substrate and enzyme have high affinity for each other when the Km is ___low52
5783500378optimal pH of gastric enzymes is ___, pancreatic enzymes ___.2, 8.5,53
5783501464optimal of enzymes is ___ degrees C, ____ degrees F, and ____Kelvin37, 98.6, 31054
5783501648Celsius to F formulaTemp (F) = Temp (C) * 9/5 + 3255
5783503296Celsius to Kelvin formulaC = 273 + K56
5783499706The Km can be altered by doing what to [E] and [S]nothing, the Km can't be altered this way57
5783508522Competitive inhibitionAdds more substrate to compete to bind to the active site. This increases the Km because the substrate increases58
5783508942noncompetitive inhibitionBinds equally (same affinity) to the allosteric sites of the enzyme and enzyme substrate complex When it binds, it changes the enzyme confiormation so that the substrate can't bind to enzyme. This decreases Vmax b/c there are less substrates and enzymes able to react, thus less reactions It does NOT effect any ES complex - thus Km is unchanged59
5783510984mixed inhibitionBinds unequally (different affinity) to the allosteric sites of the enzyme and enzyme substrate complex if it has higher affinity binding to the enzyme over the ES complex then the Km increases (which means overall, it has a lower affinity bc high Km = low affinity) It has a lower Km vise versa which means high affinity in the reaction60
5783574927uncompetitive inhibitionInhibitor only binds to the ES complex and prevents the release of enzyme thus making less products when bound and decreasing Vmax Reduces the amount of ES complexes thus reduces [S] and thus lowers Km reduced the amount of available ES we have Vmax also lowering61
5783578205Factors affecting VmaxAmount of free E or ES available to complete the reaction at high [S]62
5783578934Characteristics affecting KmWhen there's lower ES complex available -its about the affinity b/w substrate and enzyme63
5783594440Reactions with enzymes have ___ temperaturelower64
5783596762Structural Proteinsproteins that contain motif structures65
5772267805MotifA repetitive structure of structural proteins that involve secondary elements66
5772267806CollagenMakes up connective extracellular tissue Contains Gly residues Provides strength and flexibility Forms a Rt handed helix67
5772267807ElastinMakes up connective extracellular tissue Stretches and recoiles68
5772267808KeratinFound in epithelial cells Make up hair and nails69
5772267809ActinHelps provide a pathway for the flow of motor proteins down the actin filament Makes up microfilaments70
5772267810TubulinMakes up microtubules Intracellular transport via kinesin and dynein Involved in mitosis and meiosis71
5783595831Motor proteinsinteract with actin or tubulin muscle contraction and cellular movement72
5772267811MyosinThe prime motor protein that interacts with actin Cellular transport73
5772267812Dynein/kinesinInteract with tubulin Vesicles transport74
5783598879Hemoglobinis a binding protein75
5783599302cell adhesion moleculeon the cell surface that help bind to other cells or to extracellular matrix are integral membrane proteins76
5772267813Cadherinsis a cell adhesion molecule they hold similar cell types together mediate calcium dependent cell adhesion ex: epithial cells77
5783604703integrinsis a cell adhesion molecule communicate with extracellular matrix and is involved in cellular signaling and function (cell division, apoptosis, WBC migration)78
5783604704Selectinsis a cell adhesion molecule found on WBC and endothial cells that line blood vessels, play a role in defense against microorganisms, WBC migration and inflammation79
5783606709Immuniglobulinsany of a class of proteins present in the serum and cells of the immune system, that function as antibodies.80
5783606866Antiboides (immunoglobulins)the most abundant protein in the immune system They neutralize bacteria and recruit other cells to eliminate the, such as macrophages held together by disulfide bonds and N.C. bonds Bind to only to SPECIFIC antigens81
5804451777column chromatographyalumina beads are used to separate proteins based on their size and polarity the less polar proteins elude first down the column (the beads can be changed so it can separate based on polarity, pH, salinity)82
5804465797anion exchange chromatograhythe beads are POSITIVELY charged so that they attract the opposite charged compounds, an ion exchange chromatography example83
5804471884cation exchange chromatograhythe beads are NEGATIVE84
5804473426size exclusion chromatograhylarge proteins elude down the column faster because they can't fit into the tiny pores but the smaller ones do85
5804480520affinity chromatographythe beads are coated with a receptor that binds to a specific protein ex: Nickel - His tage Antibodies - Antigens Enzyme - substrate86
5783607011opsonizationwhen antobodies bind to antigens and marks pathogen for destruction87
5784552771microphagesdigest clumps of antigens and antibodies binded together88
5784557696enzyme linked receptorsmembrane receptors function as enzymes when a ligand binds89
5784558059G protein Gqstimulates phospholipase C which cleaves phosholipid to form PIP2 which is cleaves into DAG and IP3 (opens Ca2+ channels)90
5784559557Concentration determination Assayuses UV spectrum to determine the amount of protein in a sample by colorimetric change. Proteins with aromatic rings (polyenes) are useful here91
5784560532Bradford protein AssayDetermines protein concentration through the mixture of the protein and coomassive Brilliant Blue dye. When the dye is deprotonated (makes contact with protein) the color changes from brown/green to blue92
5784562417X ray chrystallographydetermines the protein structure by turning the protein into a crystal, x ray source measures the diffraction patttern, solve the phase problem and the pattern can be mapped out into a electron density map. Then this shoes the exact arrangement of the atoms in the crystal.93
5784566091NMRThe process uses that principle that nuclei have spin states and if a magnetic field is applied, an energy transfer is possible between the base energy to a higher energy level The energy transfer takes place at a wavelength that corresponds to radio frequencies and when the spin returns to its base level, energy is emitted at the same frequency. The signal that matches this transfer is measured in many ways and processed in order to yield an spectrum for the nucleus concerned.94
5804499108edman degradationa technique that determines the primary structure of amino acids. Cleaves N-term and then analyzes through mass spectroscopy95
5773491107D-fructoseis an ketohexose sugar CH2OH =O H OH OH CH2OH96
5773491108D-glucosealdohexose sugar CHO OH H OH OH CH2OH97
5773493777D-galactosealdohexose sugar CHO OH H H OH CH2OH98
5773493818D-mannosealdohexose sugar CHO H H OH OH CH2OH99
5784793299how to determine the number of stereoisomers2^n, n = # of chiral carbons100
5784793865Reducing sugarshave reducing potential because they can be oxidized, any aldose molecule is an example (glucose)101
5784794093Tollens reagentreduces Ag+ to metallic silver102
5784794155Benedicts reagentdeteccts presence of reducing sugars by turning into red precipitate103
5784794295glucose oxidasetests for glucose presence104
5804547166nitric acida powerful oxidizing agent (oxidizes)105
5784799321Reductiongains electrons, become more negative and the charge is reduced106
5784799382Oxidationlose electrons, become more positive and the charge is oxidized107
5784800714Which of these creates a carb. acid under oxidation primary, secondary or tertiary alcoholprimary only108
5804564926a secondary alcohol creates a ___ under oxidationketone109
5804566672a tertiary alcohol creates a ___ under oxidationnothing110
5784801942glycoside formationforming acetals or ketals by reactiong hemiacetals or hemiketals with alcohol Hydrolysis rxn (breaks glycosidic bonds)111
5784806385Condensation reactionforms dissacharides from monosaccharides112
5784803160Sucrosetable sugar alpha-D-glucose + Beta-D-fructose alpha-1,2 glycosidic bond113
5784803161maltoseamylase produces maltose when it breaks down starch alpha-D-glucose + alpha-D-glucose alpha-1,4 glycosidic bond114
5784803162lactoseBeta-D-glucose + Beta-D-galactose Beta-1,4 glycosidic bond115
5784806716celluloseBeta-D-glucose + Beta-D-glucose Beta-1,4 glycosidic bond116
5784806809starchalpha-D-glucose + alpha-D-glucose alpha-1,4 glycosidic bond117
5784808869Amylose and amylopectinhow plants store starch118
5784809528alpha amylase beta amylasecleaves at random spots cleaves at nonreducing end to get maltose119
5804642846liposomesimilar to a micelle but is like a circular lipid bilayer120
5784806880glycogenalpha-D-glucose + alpha-D-glucose alpha-1,4 glycosidic bond every 10th glucose moleucles is has a branched alpha-1,6 glycosidic bond121
5784808389glycogen phosphorylasecleaves glucose from nonreducing end of glycogen and phosphorylates it to yield glucose-1-phosphate122
5784810452Saturated fatty acidsare solid at room temp, can stack and solidify, more stable ex: butter less fluidity in membranes123
5804656859unsaturated fatty acidsex: olive oil124
5784814222Glycerophospholipid/phosphoglyceridesAll can be categorized as phosphoslipids but not vise versa, it is merely a subgroup of phospholipids Contain a glycerol, 2 FA chains, phosphate and an amino alcohol (that can be neg, pos or neutral) ex: phospatidylcholine, phospatidylethanolamine125
5784815333phosphodiester bondbond b/w phosphate and sugar126
5866523467anhydride bondbond b/w phosphates127
5784815525glycosidic bondbond b/w sphingosine and sugar128
5784816521Sphingolipidsnot all are phospholipids (don't contain phosphate) divided into 4 subgroups129
5784818055Glycolipidscontain 2 FA chain, sphingosine, sugar (neutral) not considered phospholipids - no phosphate group,130
5784818487cerebrosidea glycolipid with a single sugar131
5784818661globosidea glycolipid with two or more sugar132
5784818834ceramideThe simpliest sphingolipid not considered a phospholipid - no phosphate group contain 2 FA chain, sphingosine, H as head group133
5784818950sphingomyelinsare considered phospholipids - contain phosphate group, phosphotidylcholine or phosphotidylethanolamine as head group (neutral) is attached to a phosphate (phoshodiester bond) contain 1 FA chain, sphingosine134
5784818951gangliosidesnot considered phospholipids - no phosphate group oligosaccharides with NANA (salic acid) as head groups (negative charge) (glycosidic bond), sphingosine, stearic acid135
5784820208waxesA fatty acid and secondary or primary long chain alcohol that form esters for protection, water proof136
5784842205terpenesprecursor to steroids built from isoprenes137
5784842351monoterpenescontain two isoprene units138
5784842619sesquiterpenes3 units139
5784842620diterpenes4 units vitamin a140
5784842456tripenescontain six isoprene units make up cholesterol and steroids141
5784842894terpenoidsderived from terpenes precursor to steroids also ex: carotenoids (8 isoprene units)142
5784843149steroids4 rings 3 cyclohexane and one cylcopentane ring143
5804786962cholesterolan amphiphatic molecule that allows membrane fluidity important for bile acids, Vit D, and steroid hormones144
5804792039Cholesterol at low tempHigh membrane fluidity145
5784843615prostoglandinregulates synthesis of cAMP influence sleep/wake, body temp, fever, pain (homeostatic functions ) 20 carbon atoms, including a 5-carbon ring High levels are produced in response to injury or infection and cause inflammation,146
5784847664Fat soluble vitaminsA,D,E,K can't be produced by the body147
5784847822Vitamin Agrowth, vision, immune function, and dev.148
5784847961retinallight sensing molecule149
5784848049retinolstorage form of Vitamin A150
5784848146Vitamin Dfood or UV light regulates calcium and phosphate uptake in the intestines which affect bone production151
5784850496Vitamin Eknown as tocopherols and tocotrienols in the body (rings in the body that react with free radicals and destroys them thus prevents oxidative damage) are antioxidants152
5784850497Vitamin Kknown as phylloquinone and menaquinones in the body helps blood clotting and calcium to bind to proteins forms prothrombin153
5784851726Triglycerides3 FA and glycerol primary lipid storage154
5784852135Adipocytescells that sore large amounts of fats155
5784852176Saponificationester hydrolysis of TAGs to make soap with a strong base (NaOH) micelles, like in soap, allow two phases to mix because it turns the hydrophobic ends on the inside and the hydrophilic ends to interact with each other in solution. This is why soap can clean water-soluble (hydrophilic) and non water soluble messes.156
5807547717nucleotides (NDPs, NTPs, NMPs)base+sugar+phosphate157
5807547718nucleosidesbase+sugar158
5807647204Purine basestwo ring structures A and G159
5807647911Pyrimidineone ring structure T, C and U160
5807649615Aromatic ringssp2 hybridized are unreactive, very stable161
5807654239Hickels rule4n + 2 = pi electrons on aromatic rings162
5807715940Base pair A and T have __ h-bonds2163
5807715941Base pair G and C have __ h-bonds3, which make it stronger164
5807721791Chargoffs rulestates that DNA from any cell of all organisms should have a 1:1 ratio (base Pair Rule) of pyrimidine and purine bases and, more specifically, that the amount of guanine is equal to cytosine and the amount of adenine is equal to thymine.165
5807775105Beta-DNA structureRt handed helix166
5807775649Z-DNA structureLt handed helix, less stable167
5807777313Annealingforming a double stranded DNA strand168
5807786610PCRcreates copies of DNA strands doubles each round S-eparation of strands using heat A-nnealing primers to attach to templates @ lower temp E-xtention Taq polymerase creates new strand @ high temp169
5811023404PCR enzymeTi aquaticus - bacteria enzyme, heat loving170
5807790273nucleosomea bundle of DNA wrapped in histones only in Eukaryotes Rich in G and C bonds (very stable)171
5807795302Nucloeproteinsproteins are associated with DNA ex: histones172
5807800525heterochromatinthe chromatin in the nucleus that remains tightly coiled during interphase (less likely to be transcribed) appears dark173
5807802218Euchromatinthe chromatin in the cytoplasm that is loosely coiled contains active DNA (the active genes) appears light174
5807807018telomerethe DNA at the end of a chromosome that can't be replicated during DNA replication so it uses an enzyme called telomerases They help to protect chromosomes from unraveling only in Eukaryotes175
5807815156DNA replication in Eukaryotessingle origin of replication two replication forks that move away from each other in opposite directions two identical circular molecules of DNA form176
5807816582DNA replication in Prokaryoteshas multiple origins of replication replication forks move toward each other sister chromatids are created177
5807834350helicaseunwinds the FNA, requires ATP178
5807844571topoisomerasecontrols the unwinding and supercoiling works ahead of the helicase and has the opposite effect179
5807835544DNA ligaseforms phosphodiester bonds between the sugar and phosphate joins okazi fragments brings the two strands closer together seals the double helix and seals repairs180
5807839018primasebrings the RNA primer181
5807839019nucleasesenzymes that degrade DNA182
5807841943Single stranded DNA binding proteinsbind to single strands of DNA to prevent binding back to orignal strand and for protection183
5807965299DNA polymerasesynthesizes the new DNA strand in the 5-3 direction reads it in the 3-5 direction it is used on the leading strand184
5807970105The lagging strandforms small okazi fragments with RNA primers DNA polymerase can fill in the gaps by synthesizing from the 5 end of the RNA primer to the 3 end of another primer More likely to have mistakes bc its made by DNA ligase (no proof reading)185
5807976007Both the leading and lagging strands synthesize __ the replication fork and use RNA primers. Lagging uses __ primer(s) and leadings uses __ primer(s)toward, many, one186
5807995931After a phosphodiester bond is created using a dNTP, a ___is releasedppi187
5808003520DNA polymerase I (prokayrotes)removes RNA primers and replaces it with DNA nuceleotides188
5808005230DNA polymerase δ (Eukaryotes)fills the gap and synthesizes dNTPs when RNA is removed189
5808010904DNA polymerase α, δ and ε (Eukaryotes)synthesize DNA190
5808012004DNA polymerase γ (Eukaryotes)replicates mitochondria DNA191
5808013851DNA polymerase β ε (Eukaryotes)DNA repair192
5808044356DNA polymerase δ ε (Eukaryotes)for the sliding clamp193
5808046020DNA polymerase III (prokayrotes)synthesize DNA194
5808047292metastasisthe migration of cancer cells to other tissues195
5808049266oncogenesmutated genes that cause cancer promote cell cycle196
5808055787tumor suppressor genes or anticogenesthese genes function to inhibit the cell cycle or to stop tumor progression, when mutated, it can't do its job197
5808075365endonucleaseproof reads DNA and removes incorrect bases inside DNA polymerase198
5808157590Which phase in the cell cycle proof reads?G2 phase199
5808158922Which phase in the cell cycle replicates?S phase200
5810956510glycosylase enzymeremoves cytosine bases that turn into uracil in DNA and leaves behind a AP site201
5810971464recombinant DNAmolecules are DNA molecules formed by laboratory methods of genetic recombination (cloning)202
5810978710restriction enzymesrecognizes palindromic sequences (the same sequence on strands but in opposite directions)203
5811034582southern blotuses restriction enzymes to cut and gel electrophoresis to separate DNA fragments into a membrane. The fragment will bind to its complementary sequence and form a double helix. The complementary strand will be labeled to indicate its presence204
5811048120knockout micea gene that has been purposely deleted to study a disease205
5811051262transgenea cloned gene206
5811053543hybridizationjoining of complementary base pairs207
5811261131mRNA is created in transcription byRNA polymerase II binds to DNA at the promotor region (TATA box) and creates an mRNA strand RNA polymerase II also synthesizes snRNA and hnRNA208
5865929498RNA polymerase Isynthesizes rRNA209
5865932712RNA polymerase IIIsynthesizes tRNA and rRNA210
5865948173Difference between DNA and RNA polymeraseRNA polymerase doesn't need a primer and doesn't proofread211
5811327525mRNA role in translationcontains codons (start AUG) binds to ribosome the codons bind to anticodons brought by tRNA which contains the amino acids takes message from DNA to Ribosome212
5811351802How is translation terminatedwhen it reaches a stop codon which binds to a release factor213
5811668448tRNA role in translationaa ataches to 3' end (CCA sequence) brings it to ribosome with mRNA214
5865967480EUK Translation occurs in thecytoplasm (ribosome)215
5865972863Ribosome binding spotsE(uncharged tRNA leaves) P(grows the poypeptide) A (holds the incoming tRNA)216
5865987182The P site requires what enzymepeptidyl transferase (forms peptide bonds b/w a.a.)217
5833173835dry icesolid form of CO2 forms carbonic acid in aqueous solution218
5833184575equilibrium expressions{Products }/ {Reactants}219
5833234624Enantiomer propertieshave the same chemical/physical properties but differ in optical activity to separate: react with a single enantiomer of an optically active compound to form a diasteriomer (have diff chemical/physical properties). Use HPLC after220
5833259461sound waves need a __ to propegatemedium (vacuums don't have a medium)221
5861343725Pyrimidinesare CUT from purines have one ring222
5861343726Purinescontain base pairs A and G (think of as Ag like silver)223
5865870764cDNA librariesdetermines mutations by reverse transcribing processed mRNA224
5865877545glycosylationadds oligosaccharides225
5866063257prenylationadds lipid group226
5866205764operon(Prokaryotes) - control gene expression a cluster of genes (that get transcribed together into an mRNA strand) that is controlled by a promoter. Genes in the operon have an 'All or none' expression. can code for enzymes. An operon contains a promotor (where the RNA poly binds), an operator region (where the repressor binds which is encoded by regulatory genes) and a regulatory gene When repressor binds, transcription does not occur bc polymerase is blocked227
5866240632Regulator geneis a gene involved in controlling the expression of one or more other genes.228
5866257882repressora substance that acts on an operon to inhibit messenger RNA synthesis. (prevents transcription)229
5866249947Inducible system(Prokaryotes) in this process a represser binds to a operator system. It acts as a negative control, to only produce genes when needed. (only does transcription when needed bc it is an energy costly process) ex: lac operon -functions to encode genes to break down lactose by creating lactase. When lactose binds to repressor, the repressor dissociates from the operator region, making those genes available for transcription. Only uses this bacteria when glucose is low, cAMP is produced and binds to CAP. This complex can bind to he promoter region which helps recruit RNA polymerase to transcribe lactase - positive control) (genes are only transcribed in the presence of the specific compound aka lactose)230
5866249948repressible systemin this process the regulatory gene is inactive until it binds to a corepressor. The corepressor binds to the operator site to prevent transcription. ex: trp operon (genes re repressed in the presence of a specific compound and allow for the genes to be turned off) -NEGATIVE FEEDBACK231
5866300752positive controlthe binding acts to increase the transcription of a gene232
5866300753negative controlthe binding acts to decrease the transcription of a gene233
5866463519Histone acetylaseDNA in histones are more likely to be transcribed becasuse lysine in histone is acetylated (removes the positive charge, decreasing the ineraction between DNA, which is neg charged, and histone)234
5866477498Histone deacetylaseDNA in histones are less likely to be transcribed becasuse acetyl group in histones are removed, silences the gene235
5866485728DNA methylationDNA is less likely to be transcribed becasuse it adds a methyl group to C and A bases which leads to gene silencing236

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