题目内容

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.

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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.

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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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Animal and plant cells have many things in common, but during cell division they have very distinct features. Which of the following phases are very different in plant and animal cells?

A. prophase
B. metaphase
C. anaphase
D. cytokinesis

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At which stage of the cell cycle is each chromosome composed of the two chromatids in preparation for mitosis?

A. G1
B. S
C. M
D. G2

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