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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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Which of the following normally occurs during mitosis?

A. Replicated chromosomes line up on the equatorial plate.
B. Homologous chromosomes pair.
C. Unduplicated chromosomes move into the center of the cell.
D. Chromatids pair up and line up in the center of the cell.

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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.

3.1 Which of the steps above involves a cascade of biochemical reactions?

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?

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

Which of the following normally occurs during mitosis?

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.