Which of these structures is part of a muscle cell's plasma membrane that delivers signals to the sarcomere?

A) T tubule B) endoplasmic reticulum
C) actin fiber D) myosin head


Answer: A

Biology & Microbiology

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Which of the following is NOT characteristic of the phase of the cardiac cycle known as ventricular systole?

A) The atrioventricular valves close B) Atria contract, causing blood to fill the ventricles C) The ventricles contract

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During periods of stratification, transfer between surface and bottom waters is controlled by

A) mixing. B) diffusion. C) niche partitioning. D) current.

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Mole percent (G+C) of DNA is useful for determining relatedness at the ________ level.

A. class B. genus C. kingdom D. None of the choices are correct.

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Which codons are synonymous?

A) CAC and CAG B) CAC and CAU C) ACA and AGC D) UCC and GAC

Biology & Microbiology