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Exam 5: The Working Cell

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Question 31

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Bacterial production of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of tryptophan and increases as tryptophan levels decline. This is an example of

A) competitive inhibition.
B) noncompetitive inhibition.
C) feedback inhibition.
D) irreversible inhibition.

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Question 32

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How do fatty acids travel through a cell membrane?

A) diffusion
B) active transport
C) carrier proteins
D) endocytosis

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Question 33

Multiple Choice

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What is true about the data in the accompanying figure?

Inhibition of an enzyme is irreversible when

Cells acquire low-density lipoproteins (LDLs) by

Which of the following statements regarding diffusion is false?

Osmosis can be defined as

What is the basic difference between exergonic and endergonic reactions?

Aquaporins

In the lab, you use a special balloon that is permeable to water but not sucrose to make an "artificial cell." The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60% water. The solution in the balloon is ________ relative to the solution in the beaker.

Water movement is important in urine formation in the kidneys. Urine is formed when the blood is filtered by the kidneys into kidney tubules. Three figures are presented here that relate to how the kidney tubules respond to the administration of the hormone vasopressin. The direction that water flows in these figures is from the kidney tubules back into the blood. Figure A. Changes in permeability of tubules in the kidney in response to the hormone vasopressin (AVP) , which aids in osmoregulation. Figure B. Density of aquaporins in kidney tubule cells before, during, and after administration of vasopressin. Figure C. Permeability of tissues to water before, during, and after administration of vasopressin. -Based on the data from these figures, what do you expect the urine of a person to be like when vasopressin is having an effect on the kidney tubules?

Which figure depicts an animal cell placed in a solution hypotonic to the cell?

Which of the following processes is classified as a metabolic pathway?

A man with a dirty cut on his hand appears at the emergency department for treatment. In order to clean the wound, the health-care provider should use

If placed in tap water, an animal cell will undergo lysis, whereas a plant cell will not. What accounts for this difference?

In the lab, you use a special balloon that is permeable to water but not sucrose to make an "artificial cell." The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60% water. Which of the following will occur?

Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the stomach. This enzyme is a protein. Which of the following processes could be responsible for its secretion?

Which of the following statements regarding active transport is false?

Which of the following substances could be a cofactor?

The transfer of a phosphate group to a molecule or compound is called