Cell Energetics and Division
Showing posts with label Cell Energetics and Division. Show all posts
Showing posts with label Cell Energetics and Division. Show all posts

A scientist places a plant in a sealed container and measures the amount of carbon dioxide and oxygen present. For the first several days, she keeps the plant in the light and finds the oxygen concentration increases. For the next several days, she keeps the plant in the dark and notices the oxygen concentration decreases. Which of the following best explains why the oxygen concentration decreases in the dark?

Naim 10:44

A scientist places a plant in a sealed container and measures the amount of carbon dioxide and oxygen present. For the first several days, she keeps the plant in the light and finds the oxygen concentration increases. For the next several days, she keeps the plant in the dark and notices the oxygen concentration decreases. Which of the following best explains why the oxygen concentration decreases in the dark?




A. The plant used the oxygen for photosynthesis.

B. The plant used the oxygen for cellular respiration.

C. The plant produced more carbon dioxide, displacing the oxygen.

D. The plant consumed more carbon dioxide, resulting in more oxygen use.

E. The container was probably not sealed properly.






Answer: E

The oxygen consumed during cellular respiration is directly involved in:

Naim 10:43

The oxygen consumed during cellular respiration is directly involved in:





A. Glycolysis

B. accepting electrons at the end of the electron transport chain

C. the citric acid cycle

D. the oxidation of pyruvate to acetyl CoA

E. the phosphorylation of ADP.






Answer: B

Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding?

Naim 10:42

Which of the following is characterized by a cell releasing a signal molecule into the environment, followed by a number of cells in the immediate vicinity responding?




A. hormonal signaling

B. autocrine signaling

C. paracrine signaling

D. endocrine signaling

E. synaptic signaling







Answer: C

Which of the following is true concerning cancer cells?

Naim 10:41

Which of the following is true concerning cancer cells?





A. They do not exhibit density-dependent inhibition when growing in culture.

B. When they stop dividing, they do so at random points in the cell cycle.

C. They are not subject to cell cycle controls.

D. When they stop dividing, they do so at random points in the cell cycle, and they are not subject to cell cycle controls.

E. When they stop dividing, they do so at random points in the cell cycle; they are not subject to cell cycle controls; and they do not exhibit density-dependent inhibition when growing in culture







Answer: E

Density-dependent inhibition is explained by which of the following?

Naim 10:40

Density-dependent inhibition is explained by which of the following?




A. As cells become more numerous, they begin to squeeze against each other, restricting their size and ability to produce control factors.

B. As cells become more numerous, the cell surface proteins of one cell contact the adjoining cells and they stop dividing.

C. As cells become more numerous, the protein kinases they produce begin to compete with each other, such that the proteins produced by one cell essentially cancel those produced by its neighbor.

D. As cells become more numerous, more and more of them enter the S phase of the cell cycle.

E. As cells become more numerous, the level of waste products increases, eventually slowing down metabolism.








Answer: B

Movement of the chromosomes during anaphase would be most affected by a drug that

Naim 10:40

Movement of the chromosomes during anaphase would be most affected by a drug that




A. reduces cyclin concentrations.

B. increases cyclin concentrations.

C. prevents elongation of microtubules.

D. prevents shortening of microtubules.

E. prevents attachment of the microtubules to the kinetochore.







Answer: D

Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol disrupts microtubule formation by binding to microtubules and accelerating their assembly from the protein precursor, tubulin. Surprisingly, this stops mitosis. Specifically, Taxol must affect

Naim 10:39

Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol disrupts microtubule formation by binding to microtubules and accelerating their assembly from the protein precursor, tubulin. Surprisingly, this stops mitosis. Specifically, Taxol must affect




A. the formation of the mitotic spindle.

B. anaphase.

C. formation of the centrioles.

D. chromatid assembly.

E. the S phase of the cell cycle.







Answer: A

In an experiment to track the movement of growth factor molecules from secretion to the point of receptor binding in a particular species of mammal, a student found a 20-fold reduction in mm traveled when in the presence of an adrenal hormone. This is in part attributable to which of the following?

Naim 10:39

In an experiment to track the movement of growth factor molecules from secretion to the point of receptor binding in a particular species of mammal, a student found a 20-fold reduction in mm traveled when in the presence of an adrenal hormone. This is in part attributable to which of the following?




A. The growth factor is a paracrine signal.

B. The growth factor depends on osmosis.

C. The mammal only carries growth factor through the lymph.

D. The growth factor is an exocrine signal.

E. The growth factor is an endocrine signal.







Answer: A
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