AP Notes, Outlines, Study Guides, Vocabulary, Practice Exams and more!

Facilitated diffusion

Campbell Biology Test Bank Chapter 7

Subject: 
Biology
Rating: 
0
No votes yet
Tags: 
Biology
Membrane biology
Cell membrane
Lipid bilayer
Membrane potential
Osmosis
Facilitated diffusion
Lipid raft
Red blood cell
Biological membrane
Semipermeable membrane
Membrane protein
health

Campbell's Biology, 9e (Reece et al.) Chapter 7 Membrane Structure and Function Membranes and membrane transport are fundamental to cellular life. The concepts in this chapter require integration of concepts from previous chapters: the nature of water and hydrophobic versus hydrophilic molecules, the properties of lipid molecules and their role in regulating membrane fluidity, and the roles of proteins and carbohydrates in membrane function. The concepts of ion transport and electrochemical gradients across membranes are important foundations for the following chapters on energy metabolism. Finally, the bulk transport phenomena have important clinical significance in the immune system, during invasion by pathogens, and in cell signaling. Multiple-Choice Questions

Cell Membrane

Subject: 
Biology
Rating: 
0
No votes yet
Tags: 
Biology
Membrane biology
Cell membrane
Facilitated diffusion
Osmosis
Carrier protein
Membrane protein
Lipid bilayer
Passive transport
Cytosol
Active transport
Tonicity
health

Cell Membrane Fluid Mosaic Model: Cell membranes consist of a fluid formed by a phospholipid bilayer and a ?mosaic?, or patchwork, of proteins Phospholipid: Polar and hydrophilic head, nonpolar and hydrophobic fatty acid tail Cell membrane also called plasma membrane Outside the membrane there is interstitial fluid, which is a salty liquid Inside the membrane there is the cytosol, which is mostly water. The cytosol is also the water portion of the cytoplasm Phospholipid bilayer: Formed since the hydrophilic heads form hydrogen bonds with water, causing the heads to face the water on either side. Since the fatty acid tails are hydrophobic, they cluster together within the bilayer

Ch. 7 Membrane Structure and Function

Subject: 
Biology
Rating: 
0
No votes yet
Tags: 
Biology
Membrane biology
Cell membrane
Membrane protein
Membrane transport
Lipid bilayer
Facilitated diffusion
Semipermeable membrane
Carrier protein
Osmosis
Red blood cell
Passive transport
health
membranes

Ch. 7 Membrane Structure and Function Plasma membrane separates living cell from its surroundings Controls traffic into and out of the cell it surrounds Selectively permeable: allows some substances to cross easier than others One of the earliest episodes in the evolution of life may have been the formation of a membrane that enclosed a solution different from the surrounding solution while still permitting the uptake of nutrients and elimination of waste products. Ability of cell to discriminate in chemical exchanges with its environment is fundamental to life Lipids and proteins are the staple of membranes; carbohydrates are also important Phospholipid is amphipathic meaning it has hydrophilic and hydrophobic regions

Campbell Biology 9th - Unit 1

Subject: 
Biology
Rating: 
0
No votes yet
Tags: 
Biology
Membrane biology
organelles
Cell membrane
Endomembrane system
Membrane protein
Vesicle
cell
Endoplasmic reticulum
Biological membrane
Lipid bilayer
Facilitated diffusion
health

9/28/13 2:53 PM Tools used to study cells Microscopy Light microscope Electron microscope Scanning Transmission Cell fractionation - centrifuge Cells ? simplest collection of matter that can be alive All contain: Plasma membrane Cytosol Chromosomes Ribosomes Cytoplasm ? interior of cell Limited to small size because High SA to volume ration necessary for exchange between cell & environment As cells grow, volume increases at higher rate than SA Prokaryotic Lack nuclei and other membrane-enclosed organelles Nucleoid Location of DNA Not membrane enclosed Fimbriae Ribosomes Plasma membrane Cell wall Capsule Flagella Surface to volume ratio is important parameter affecting cell size & shape ORGANELLES IN EUKARYOTIC CELL Nucleus Functions: Houses chromosomes

Campbell Biology Ch 7 Study Guide

Subject: 
Biology
Rating: 
0
No votes yet
Tags: 
Biology
Membrane biology
Cell membrane
Osmosis
Semipermeable membrane
Lipid bilayer
Membrane transport
Membrane protein
Carrier protein
Facilitated diffusion
Biological membrane
Active transport
health

CHAPTER 7 MEMBRANE STUCTURE AND FUNCTION Membrane Structure Explain the meaning of the statement that phospholipids and most other membrane constituents are amphipathic molecules. It means that they have both a hydrophilic region and a hydrophobic region. Explain how the fluid mosaic model of a membrane is structured and the evidence that supports the model. The membrane is a fluid structure with a mosaic of various proteins embedded in or attached to a double layer of phospholipids. Using freeze-fracture to study cells under an electron microscope has shown a pattern that appears to agree with the fluid mosaic model. Describe the fluidity of the components of a cell membrane and explain how membrane fluidity is influenced by temperature and membrane composition.

Pages

Subscribe to RSS - Facilitated diffusion

Need Help?

We hope your visit has been a productive one. If you're having any problems, or would like to give some feedback, we'd love to hear from you.

For general help, questions, and suggestions, try our dedicated support forums.

If you need to contact the Course-Notes.Org web experience team, please use our contact form.

Need Notes?

While we strive to provide the most comprehensive notes for as many high school textbooks as possible, there are certainly going to be some that we miss. Drop us a note and let us know which textbooks you need. Be sure to include which edition of the textbook you are using! If we see enough demand, we'll do whatever we can to get those notes up on the site for you!