In order for a muscle to contract, calcium ions released from the sarcoplasmic reticulum must bind to 

A. troponin.
B. myosin.
C. tropomyosin.
D. ATP.
E. actin.


A. troponin.

Biology & Microbiology

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Which human cell type can be over a meter in length?

a. neurons b. chondrocytes c. columnar epithelial cells d. skeletal muscle cells e. adipocytes

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An animal’s capacity to conserve water and to

concentrate solutes for excretion in the urine is greater in a kidney with longer a. Bowman’s capsules b. loops of Henle c. proximal tubules d. ureters e. afferent arterioles

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The atomic number of sodium is 11, and the atomic mass (mass number) is 23. This indicates that one atom of sodium will contain ________.

Fill in the blank(s) with the appropriate word(s).

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Which of the following observations supports the "good genes" hypothesis to explain male/male competition and female choice?

A. The color and quality of male sage grouse air sacs, used in courtship displays, are extremely sensitive to parasitic infections B. Ring-tailed lemurs mate only during the autumn breeding season, and females are not receptive to males at other times of the year C. Female widowbirds prefer males with the longest tails, but males with longer tails are more susceptible to predation D. Human males with symmetrical faces are considered more attractive than those with asymmetrical faces

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