Viral envelopes are composed of ________.

A. lipids
B. carbohydrates
C. proteins
D. All of the choices are correct.


Answer: D

Biology & Microbiology

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Substance P _____

a. increases pain-related signals b. is a natural painkiller c. is the active ingredient in aspirin

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When a caterpillar spins a cocoon, this is 

A. learned behavior. B. imprinting. C. unlearned (instinctive) behavior. D. a conditioned response.

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What number is the Cell wall?

What will be an ideal response?

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The balance between osteoblast and osteoclast activities is an example of homeostasis and is regulated by the action of two hormones.

a. true b. false

Biology & Microbiology