The proteins, myosin and ribose play a key role in contraction of muscle fibers. Indicate whether the statement is true or false


False - actin

Biology & Microbiology

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Thyroxine, the primary hormone produced by the thyroid, contains what element?

a. selenium b. chromium c. vanadium d. iodine e. manganese

Biology & Microbiology

Nerve gas has its effect by causing the

accumulation of ___ in the synaptic cleft.

a. dopamine b. serotonin c. acetylcholine d. epinephrin e. an endorphin

Biology & Microbiology

Differences in receptive fields in the retina

a. help prevent the brain from being bombarded with confusing signals. b. account for color differentiations. c. account for acuity differences. d. invert the images on the retina. e. allow for perception of light intensity.

Biology & Microbiology

A mutation is a

A) dose of radiation. B) defective egg or sperm cell. C) physical deformity, such as the loss of a limb. D) change in the DNA sequence.

Biology & Microbiology