BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 5, Problem 1A
A bacterial cell that can alter the composition of saturated and unsaturated fatty acids in its membrane lipids is adapted to a cold environment. If this cell is shifted to a warmer environment, it will react by
a. increasing the amount of cholesterol in its membrane.
b. altering the amount of protein present in the membrane.
c. increasing the degree of saturated fatty acids in its membrane.
d. increasing the percentage of unsaturated fatty acids in its membrane.
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Students have asked these similar questions
How do bile salts remove excess cholesterol from the body
a) Bile salts stabilize deposited cholesterol
b) cholesterol is converted to bile salts that are later eliminated through feces.
c) Both of these processes remove cholesterol from the body
d) None of these processes remove excess cholesterol from the body
Which of the following statements is true of cell membrane proteins?
a) They are suspended on the surface of the membrane.
b) They are partly embedded in the bilayer.
c) They span across the bilayer and project from both sides
d) Any of these are true, depending on the specific membrane protein
One of the following is TRUE?
A. The transport of Na+ across cell membranes depends solely on concentration gradient
B. The transport of sucrose across cell membranes depends solely on concentration gradient
C. The transport of K+ across cell membranes depends solely on concentration gradient
D. The transport of Ca2+ across cell membranes depends solely on concentration gradient
E. A & C
Active transport pumps are used to move sodium ions across the membranes of gill cells in freshwater fish species. Which of the following statements about the pumps is accurate?Explain.
a) There are specific binding sites for sodium ions on the pump
b) They require osmosis to carry the sodium ions into the cell
c) This is an example of passive diffusion and ATP is required
d) Their lipid based structure allows it to embed in the cell membrane
Chapter 5 Solutions
BIOLOGY
Ch. 5.1 - Prob. 1LOCh. 5.1 - Explain the fluid mosaic model of membrane...Ch. 5.2 - List the different components of phospholipids.Ch. 5.2 - Prob. 2LOCh. 5.2 - Prob. 3LOCh. 5.3 - Illustrate the functions of membrane proteins.Ch. 5.3 - Prob. 2LOCh. 5.3 - Prob. 3LOCh. 5.4 - Compare simple diffusion and facilitated...Ch. 5.4 - Prob. 2LO
Ch. 5.4 - Prob. 3LOCh. 5.5 - Prob. 1LOCh. 5.5 - Prob. 2LOCh. 5.5 - Prob. 3LOCh. 5.6 - Distinguish between endocytosis and exocytosis.Ch. 5.6 - Illustrate how endocytosis can be specific.Ch. 5 - According to the fluid mosaic model, membranes are...Ch. 5 - Prob. 2IQCh. 5 - The fluid mosaic model of the membrane describes...Ch. 5 - What chemical property characterizes the interior...Ch. 5 - The transmembrane domain of an integral membrane...Ch. 5 - The specific function of a membrane within a cell...Ch. 5 - The movement of water across a membrane is...Ch. 5 - Prob. 6UCh. 5 - Which of the following is NOT a mechanism for...Ch. 5 - A bacterial cell that can alter the composition of...Ch. 5 - What variable(s) influence(s) whether a nonpolar...Ch. 5 - Which of the following does NOT contribute to the...Ch. 5 - How are active transport and coupled transport...Ch. 5 - A cell can use the process of facilitated...Ch. 5 - figure 5.5 describes a classic experiment...Ch. 5 - Each compartment of the endomembrane system of a...Ch. 5 - The distribution of lipids in the ER membrane is...
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- Na+ moves from high to low concentration, across the plasma membrane, through a protein channel that is permenantly open. Which statement is true about this process? a. It does not require ATP b. It is a form of active transport c. Movement is against the concentration gradient of Na+ d. The channel probably allows many different molecules and ions to crossarrow_forwardA dehydrated runner drinks a lot of water after a race. His cells become rehydrated after drinking water because (a) The bloodstream is hypotonic compared to the contents of the digestive tract. (b) The contents of the digestive tract are hypotonic to the bloodstream. (c) The contents of the bloodstream and digestive tract are isotonic to each other. (d) Water will diffuse from a low concentration to a high concentration. (e) The contents of the digestive tract are hypertonic to the bloodstream. Explain your answerarrow_forwardImagine a hypothetical cell with a higher concentration of glucose inside the cell thanoutside. Answer the following questions about this cell, assuming all transport acrossthe membrane is passive, not active.a. Can the glucose simply diffuse across the cell membrane? Why or why not?b. If there are glucose transport proteins in the cell membrane, which way wouldglucose flow- into or out of the cell? Explain your answer.c. If the concentration of glucose was equal inside and outside of the cell, do you thinkthere would be a net flow of glucose across the cell membrane in one direction orthe other? Explain your answer.arrow_forward
- Glucose is transported across the cell membrane of intestinal cells. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells? A facilitated diffusion B simple diffusion C osmosis D concentration gradientarrow_forward1. When all the protein carriers are used up, the carriers are said to be A. Adapted B. Unsaturated C. Saturated D. Consumed 2. The proteins that constantly transport sodium ions outside the membrane is called A. Membrane pump B. Calcium-potassium pump C. Sodium-potassium pump D. Glucose-potassium pump E. Protein-potassium pump 3. The process in the question above gets its energy from A. ADP B. ACT C. PTA D. ATP E. TPAarrow_forwardIf a membrane protein in an intact erythrocyte reacts with a membrane-impermeable reagent, what can you conclude about the protein? A. It is a transmembrane protein. B. It is a peripheral membrane protein. C. At least one domain of the protein is located on the outer face of the membrane. D. It is not a plasma membrane protein.arrow_forward
- If the concentration of a solute is the same both inside and outside the cell, what might you expect with regard to its transport by a membrane protein? A. Since there is no concentration gradient, no transport either in or out of the cell is possible. B. The transport protein has been saturated. C. The solute must be phosphorylated with a phosphate group from ATP before further transport can occur. D. Movement of the solute across the membrane could occur and cause accumulated on one side of the membrane by an active transport protein. The concerted model of allosteric regulation is different from the sequential model, because: A. The concerted model is used to explain homotropic effects B. The sequential model is used to explain heterotropic effects C. Both A and B D. Neither A nor Barrow_forwardCO2 can cross the plasma membrane by diffusion. If a cell is in the process of metabolizing glucose, which direction would diffusion tend to carry CO2 molecules? (It may help to consider: where is CO2 highly concentrated? Would diffusion carry CO2 toward or away from this location? Group of answer choices A. From inside the cell to outside the cell B. From outside the cell to inside the cell C. not enough info to tellarrow_forwardThe cells lining the small intestine rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information which transport mechanism is most probably functioning in the intestinal cells? a) simple diffusion b) phagocytosis c) active transport pump d) exocytosis e) Facilitated diffusionarrow_forward
- Based on the picture, B. What is the primary function of #5 within a cell? A. Form membranes B. Store energy C. Structural support D. Maintain constant pHarrow_forwardOf the following functions the peripheral glycoproteins and glycolipids (surface markers) of animal cell membranes are most important for a) the ability of the cell to recognize like and different cells. b) active transport of molecules against their concentration gradients. c) facilitated diffusion of molecules down their concentration gradients. d)maintaining membrane fluidity at low temperatures.arrow_forwardWhat is a signal peptide? A. A sequence of amino acids in endomembrane system proteins that directs them to the endoplasmic reticulum B. The sequence of amino acids in every protein that determines its location in the cell C. A protein that directs other proteins where to go in the cell D. A sequence of amino acids that gets added to proteins that are free-floating in the cytoplasmarrow_forward
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