Evolution acts at the level of the 

A. ecosystem.
B. population.
C. species.
D. community.


B. population.

Biology & Microbiology

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The zig-zag and solenoid models are associated with the _______ level of DNA organization

A. histone B. 11nm fiber C. beads-on-a-string D. 30 nm fiber E. scaffold protein

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Gene doping is an approved and widely accepted training technique for elite athletes

a. True b. False Indicate whether the statement is true or false

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The sarcoplasmic reticulum releases calcium ions when stimulated directly by the

A. axon bulb. B. neuromuscular junction. C. sarcolemma. D. tropomyosin. E. T tubule.

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What would happen if the trachea did not have cartilaginous rings?

A) The trachea would collapse. B) Sense of smell would be lost, and food would taste funny. C) Incoming air would not be humidified. D) Incoming air would not undergo filtration.

Biology & Microbiology