All mammals ________.

A. are ectothermic
B. have mammary glands and hair
C. are nocturnal
D. give birth to live young


Answer: B

Biology & Microbiology

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The motile, feeding stage of protozoa is called the ________.

A. cyst B. trophozoite C. food vacuole D. sporozoite E. oocyst

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Reverse transcriptase creates a single-stranded DNA molecule that is complementary to an mRNA template

a. True b. False

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Natural selection can alter gene frequencies in a population because

A) carriers of inherited disease rarely survive to reproduce. B) it maintains alleles that improve survival to sexual maturity. C) it compensates for defects caused by deleterious alleles. D) individuals with deleterious alleles selectively interbreed.

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The type of chemical bond that connects the sugars and phosphates together in a DNA molecule is a

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

Biology & Microbiology