20) Cells shrink when you place them in a solution with a high concentration of niacin (Vitamin B3), a component of NADH. This indicates that the cell membrane: IS permeable to niacin but NOT to water. Is NOT permeable to niacin but IS permeable to water. IS permeable to BOTH niacin and water. Is NOT permeable to EITHER niacin OR water

20) Cells shrink when you place them in a solution with a high concentration of niacin (Vitamin B3), a component of NADH. This indicates that the cell membrane: IS permeable to niacin but NOT to water. Is NOT permeable to niacin but IS permeable to water. IS permeable to BOTH niacin and water. Is NOT permeable to EITHER niacin OR water

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter2: Cell Physiology

Section: Chapter Questions

Problem 5SQE

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CO2 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 tell
A research student creates an artificial animal cell containing a 5M solution of glucose with a selectively permeable membrane that only allows water to cross it. She places the cell into a beaker of water. After an hour, what effect do you expect to observe? (a) Water moves out of the cell causing it to shrink. (b) Glucose moves out of the cell until equilibrium is reached. (c) Water moves into the cell causing it to lyse/burst. (d) Glucose moves into the cell by facilitated diffusion. (e) There is no net movement of water or glucose. Explain your answer
In cell membrane, the regulation of membrane rigidity is the function of _____. While proteins ______ A. Carbohydrates; Cell recognition B. Cholesterol; Move nutrients and electrolytes across C. Lipid; Impart polarity to the interior membrane D. Fatty acids; Prevent tight packing of fatty acid chains E.Cholesterol; Act as receptors for neurotransmitter and hormone binding
Plasma membranes are selectively permeable. This means: A. cholesterol cannot enter B. anything can pass in and out C.the membrane regulates the passage of the material in and out of the cell D. glucose cannot enter the cell
Which of the following explains why a cell's size is limited? a The cell membrane increases too fast for the cytoplasm to keep up with its reactions. b The cell membrane becomes rigid. c The cell membrane cannot supply enough substances to support organelles in the center. d The cell membrane is too large to allow for transport.
A human pancreatic cell obtains O2—and necessary molecules such as glucose, amino acids, and cholesterol—from its environment, and it releases CO2 as a waste product. In response to hormonal signals, the cell secretes digestive enzymes. It also regulates its ion concentrations by exchange with its environment. Based on the structure and function of cellular membranes, describe how such a cell accomplishes these interactions with its environment.
What would likely happen in a cell if the ratio of ATP to ADP were to become 1:1?
Why are ion channels necessary to transport ions into or out of a cell? a. Ions are too large to diffuse through the membrane. b. Ions are charged particles and cannot diffuse through the hydrophobic interior of the membrane. c. Ions do not need ion channels to move through the membrane. d. Ions bind to carrier proteins in the bloodstream, which must be removed before transport into the cell.
The plasma membrane of a cell is composed of a ________ ________ and regulates molecular passage via _______ ________. a. potassium bilayer, unidirectional diffusion b. phospholipid bilayer, selective permeability c. phospholipid bilayer, random permeability d. protein wall, osmotic pumps
Cellular respiration is divided into 3 phases, each yielding a different amount of energy. A yeast cell is placed in an open flask in the laboratory. The flask contains sugar, water, and grape juice. a. Describe which phases of cell respiration will take place and list the amount of energy that will be made during those phases.
9)Two solutions are separated by a selectively permeable membrane that is not permeable to glucose. On one side of the membrane, solution A contains 10 percent glucose and on the other side, solution B contains 25 percent glucose. Which of the following is true? Select one: a. Solution A is hypertonic. b. The solutions are isotonic. c. Water would move from solution A to solution B. d. Glucose would move from solution B to solution A.
Glycolipids and glycoproteins on membranes are most directly involved in _____________. Select one: a. cellular communication b. respiration c. cell energetics d. protein synthesis e. creating a nonzero membrane potential

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IS permeable to niacin but NOT to water.
		Is NOT permeable to niacin but IS permeable to water.
		IS permeable to BOTH niacin and water.
		Is NOT permeable to EITHER niacin OR water