Gene duplication _________ genetic variation and natural selection _________
Fill in the blank(s) with the appropriate word(s).
Answer: increases, decreases
Biology & Microbiology
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Seawater typically is
a. highly basic. b. neutral. c. somewhat basic. d. somewhat acidic. e. highly basic.
Biology & Microbiology
The condition of having no sperm in the semen is called _____________. Fill in the blank(s) with the appropriate word(s)
Biology & Microbiology
Which of the following statements about the nitrogen cycle is true?
A) The nitrogen cycle requires different types of bacteria. B) Nitrogen gas is converted to nitrates in plant leaves. C) Nitrogen cannot be cycled through living organisms. D) When plants and animals die, nitrogen is removed from the nitrogen cycle
Biology & Microbiology
Self-recognition is based on T cell receptors recognizing:
a. MHC markers b. perforins c. complement d. naive B cells e. antibodies
Biology & Microbiology