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AP Biology Bacteria Flashcards Flashcards

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4962134145Prokaryotes-DNA but no envelope (chromosomes in nucleoid) -no specialized organelles -unicellular -have cell walls and cell membranes -microscopic -bacteria and archaebacteria -have much less DNA than eukaryotes -short generation time--evolve quickly0
4962405882Fibriaallow prokaryotes to stick to host cell or other individuals in a colony1
4962410874Pilusused in conjugation to connect two bacterial cells2
4962413874Taxismovement either towards or away from a stimulus3
4962420692Flagellumallow bacterial cells to move; consists of motor and hook4
4962422300Endosporecreated in harsh conditions -contains the DNA from a bacterial cell (only the important stuff) -can sit dormant for a while before it gets activated again and becomes a full cell5
4962436839Binary Fissionthe process by which prokaryotes asexually reproduce 1. DNA is replicated 2. Cell split in half 3. 2 daughter cells are produced (identical to parent cell)6
4962453839Genetic Recombinationthe combining of DNA from two sources -genetic variation comes this ((mutations)) -is NOT cell reproduction like binary fission -prokaryotic DNA is brought together through transformation, transduction and conjugation7
4962461765Transformationwhen a prokaryotic cell takes up and incorporates foreign DNA from the surrounding environment8
4962466377Transductionthe movement of genes between bacteria cells through bacteriophages -bacteriophage delivers bacteria's DNA and the ending recombinant DNA is original bacteria's DNA + ending bacteria's DNA 1. Virus inserts its DNA into original bacterial cell--viral and bacterial DNA will mix 2. Lytic or lysogenic cycle will take place--with lytic cycle, new viruses with bacterial DNA will exit original bacterial cell 3. New virus injects the V/B DNA into ending bacterial cell 4. That ending bacterial cell will have original bacterial cell's DNA (plus some viral DNA)9
4962521856Conjugationthe process by which genetic material is transferred between prokaryotic cells -donor cell attaches to recipient by a pilus, pulls it closer and transfers DNA10
4962543329F-Factora piece of DNA necessary for the production of a pilus -can come in two forms: in the plasmid or in the chromosomal DNA11
4962547907F-Factor in Plasmid-cells w/ f plasmid function as donors during conjugation -f factor is transferable during conjugation--both cells end up f positive -the recipient has its own chromosomal DNA plus the donor's plasmid -F POSITIVE12
4962558576F-Factor in Chromosomes-cells w/ f factor built into chromosomes act as donors during conjugation -the recipient becomes a recombinant bacterium with chromosomal from itself and the donor -F NEGATIVE but Hfr POSITIVE13
4962595312R Plasmidcarries genes for antibiotic resistance -resistance is always on the plasmid -r plasmid can be passed onto other cells through reproduction -antibiotics kill sensitive bacteria but cannot kill bacteria with specific R plasmids -fraction of bacteria with genes for resistance increases in a population exposed to antibiotics14
4962643931Bacteria-most common shapes: spheres, rods and spirals -shape and whether gram-positive or negative determines what kind of bacteria it is -reproduce through binary fission15
4962656563Capsuleprotects bacterial cell and helps the cell attach to other cells and surfaces -polysaccharide or protein layer -not in all bacterial cells -why they are so hard to kill16
4962666912Cell Wallprotects the cell and gives it the shape -made of peptidoglycan -on the outer side of cell17
4962672301Peptidoglycanwhat makes up bacterial cell walls; network of sugar polymers cross-linked by polypeptides -amino acids and carbohydrates18
4962677963Cell Membraneregulates the types of molecules that move into and out of the cell -on inner side of cell19
4962679908Cytoplasmcontains bacterial DNA, ribosomes20
4962682253Plasmidcarries genes that are transferred through genetic recombination; circular loop of DNA -not located in nucleoid region21
4962699503Gram-Positive Bacteriahave simpler walls with a large amount of peptidoglycan -peptidoglycan is outside layer22
4962706617Gram-Negative Bacteriahave less peptidoglycan and an outer membrane that can be toxic -2 phospholipid bilayers with peptidoglycan layer in the middle (harder to reach--more likely to be antibiotic resistant)23
4962712680Phototrophderives energy from light24
4962714399Chemotrophderives energy from chemicals25
4962714400Autotrophrequire carbon dioxide as a carbon source26
4962717391Heterotrophrequire an organic nutrient to make organic compounds27
4962720034Pathologystudy of disease -pathogens are bacteria or viruses that cause disease28
4962722530Exotoxinsgram-positive based ex. tetanus29
4962724595Endotoxinsgram-negative; lipid and carbohydrates based ex. E. coli30
4962729672Antibioticsdrugs that combat bacteria31

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