The most abundant gas in the atmosphere is

a. carbon dioxide.
b. hydrogen.
c. nitrogen.
d. oxygen


C

Biology & Microbiology

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The ability to conjugate depends on the presence within the donor cell of a plasmid called the ____

a. X factor b. F factor c. C factor d. sex pilus e. S factor

Biology & Microbiology

True kidneys have tubules called

a. nephrons. b. hepatic tubules. c. metanephridia. d. Malpighian tubules. e. protonephridia.

Biology & Microbiology

__________ attach a gametophyte to soil or another

surface. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the following cells have reduced or very little active telomerase activity?

A) most normal somatic cells B) most normal germ cells C) most cancer cells

Biology & Microbiology