3.2 During which phase of the cell cycle would a cell go into a quiescent state?
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3.2 Which of the following best explains why the concentration of cyclin increases throughout interphase?
As the levels of MPF drop, the enzyme that destroys cyclin declines and the synthesis of cyclin begins.
B. Cyclin replaces MPF in the cell once the cell has reached metaphase during mitosis.
C. The cyclin-dependent kinase creates cyclin.
D. The cell enters into a quiescent state which increases the cyclin.
3.1 During the fight or flight response, the communication between cells elicits a variety of physiological responses. Epinephrine will travel throughout the body and cause which of the following actions?
A. Epinephrine travels to the skin and causes the hair to rise on skin and the sweat to be expelled.
B. Epinephrine travels to the lungs and causes the respiration rate to increase.
C. Epinephrine travels to the heart, stimulates the pacemaker cells, and increases the circulation of the blood.
D. Epinephrine causes all the above to occur.
3.1 An antelope hears a lioness approaching. The antelope's adrenal glands release epinephrine. What is the first action of the epinephrine as it proceeds through the signal transduction pathway?
A. Epinephrine alters the permeability of the cell membrane.
B. Epinephrine acts as ligand as it binds to the epinephrine receptor in the cell membrane.
C. Epinephrine combines to the receptor causing the receptor to become inactivated.
D. Epinephrine causes the body to produce more ATP.
3.1 Which of the steps above involves a cascade of biochemical reactions?
A. stages A and B
B. stages B and C
C. stages A, B, and C
D. stage B only
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