Currently in the United States, approximately ________ couples have difficulty in conceiving or giving birth to children.

A) 1 in 6

B) 1 in 30

C) 1 in 100

D) 1 in 200


A) 1 in 6

Biology & Microbiology

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Animals that have external fertilization are most likely to reproduce in which of the following areas?

A) sand dune B) polar ice sheet C) shallow lake D) tallgrass prairie

Biology & Microbiology

A mutant you made in the laboratory with 5-bromouracil suddenly regains the wild-type phenotype. You discuss this phenomenon with your advisor and colleagues, and they suggest you try transposon mutagenesis to avoid this problem and create stable mutants

Why would mutants created with 5-bromouracil be more likely to regain the wild-type phenotype than mutants created via transposon mutagenesis? What will be an ideal response?

Biology & Microbiology

Rubisco has 16 subunits joined together to make a functional unit. Eight of the subunits are large, the other 8 are

small. On which subunit(s) is/are the active sites located?

a. on each of the 8 large subunits b. on each of the 8 small subunits c. on one of the 8 large subunits d. on one of the 8 small subunits e. on each of the 16 subunits

Biology & Microbiology

Signaling molecules involved in the paracrine and autocrine signaling:

a) travel through the circulatory system b) remain attached to the plasma membrane c) travel by diffusion

Biology & Microbiology