For which of the following is the number the same in spermatogenesis and oogenesis?
A) timing of meiotic divisions
B) functional gametes produced by meiosis
C) meiotic divisions required to produce each gamete
D) different cell types produced by meiosis
C
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Species of the genus Thiobacillus
A. oxidize inorganic sulfur compounds and produce ATP. B. are ubiquitous in soil, freshwater, and marine environments. C. produce acids that leach metals out of ore. D. All of the choices are correct.
The antimicrobial action of artemisinin is not well understood but this chemical appears to ________.
A. form reactive oxygen intermediates inside Plasmodium-infected red blood cells B. raise the internal pH, clump the plasmodial pigment, and intercalate into plasmodial DNA C. swell the Plasmodium falciparum food vacuoles D. inhibit heme polymerase, an enzyme that converts toxic heme into nontoxic hemazoin
Which form of electromagnetic radiation has the shortest wavelength?
A) Gamma rays and X rays B) Ultraviolet light C) Visible light D) Infrared light
Aerobic cyanobacteria carry out the reactions of nitrogen fixation in
A) akinetes. B) endospores. C) heterocysts. D) chloroplasts. E) lamellae.