In populations where individuals with intermediate values of a trait have the highest fitness, the average value of the trait does not change over time, but the variation tends to be reduced. This set of circumstances is known as ________

[two words] Fill in the blank(s) with correct word


stabilizing selection

Biology & Microbiology

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In the three-tier Laboratory Response Network, confirmed bioterrorism agents should be sent to which laboratory?

a. Clinical b. Sentinel c. Reference d. National

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In skeletal muscle contraction, the neurotransmitter ____ is released at the axon terminal of the neuromuscular

junction to trigger an action potential in the muscle cell.

a. troponin b. Ca2+ c. tropomyosin d. ATP e. acetylcholine

Biology & Microbiology

The urinary bladder is useful because it

A. transports urine to the outside of the body. B. helps with defecation. C. filters wastes and recycles nutrients back into the bloodstream. D. is a place where white cells attack bacteria. E. stores urine to prevent constant urination.

Biology & Microbiology

Which of the following would not be found in RNA?

A. Guanine B. Cytosine C. Thymine D. Uracil E. Adenine

Biology & Microbiology