In a human fetus that has the XX combination of sex chromosomes, the gonads develop into ovaries

a. True
b. False


ANSWER: True

Biology & Microbiology

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Dyes are usually added to sections of biological specimens to increase

a. resolving power. b. magnification. c. contrast. d. all of the above.

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Water-soluble hormones affect target cells by binding to __________.

A) adenylate cyclase B) cytoplasmic receptors C) protein kinases D) cAMP E) plasma membrane receptors

Biology & Microbiology

The most common respiratory pigments in animals are:a

myoglobin and hemocyanin. b. myoglobin and hemoglobin. c. hemocyanin and hemoglobin. d. mucus and hemoglobin. e. pulmonary surfactant and myoglobin

Biology & Microbiology

A microbial geneticist observes that a significant number of pyrimidine dimers are present in bacterial DNA following exposure to a particular mutagen. To which mutagen were the bacterial cells likely exposed?

A. UV light B. X-rays C. Acridine orange D. 5-bromouracil

Biology & Microbiology