Across the lifespan of a human female, the number of primary oocytes peaks at the onset of puberty.

Answer the following statement true (T) or false (F)


False

At birth, each ovary in a human female has about 1 million primary oocytes, which are arrested in prophase of meiosis I. Most of these degenerate before the onset of puberty, when each ovary contains about 200,000 primary oocytes. Other than this degeneration, the ovaries are quiescent until puberty, when they begin to show cyclical activity.

Biology & Microbiology

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Which of the following best describes the logic of scientific inquiry?

A) If I generate a testable hypothesis, tests and observations will support it. B) If my prediction is correct, it will lead to a testable hypothesis. C) If my observations are accurate, they will support my hypothesis. D) If my hypothesis is correct, I can expect certain test results. E) If my experiments are set up right, they will lead to a testable hypothesis.

Biology & Microbiology

The function of carbonic anhydrase is

a. to speed up the conversion of CO2 and H2O into HCO3 ? and H+. b. to speed up the conversion of HCO3 ? and H+ into CO2 and H2O. c. to speed up the rate at which CO2 binds to hemoglobin. d. to speed up the conversion of CO2 and H2O into HCO3 ? and H+, and to speed up the conversion of HCO3 ? and H+ into CO2 and H2O. e. to speed up the conversion of HCO3 ? and H+ into CO2 and H2O, and to speed up the rate at which CO2 binds to hemoglobin.

Biology & Microbiology

Give the sex of the following people assuming that the autosomes are present in the normal number. XO; XY; XXY. Answers are in order (respectively)

A) male; male; female B) male; female; female C) female; male; female D) female; male; male E) male; male; male

Biology & Microbiology

Pneumocystis jirovecii 

A. lacks ergosterol in its plasma membrane. B. has protozoan and fungal characteristics. C. is an obligate parasite. D. causes serious infection in elderly, premature infants, and AIDS patients. E. All of the choices are correct.

Biology & Microbiology