The second round of meiosis in the testes produces ____
a. primary spermatocytes
b. secondary spermatocytes
c. polar bodies
d. spermatogonia
e. spermatids
ANSWER: e
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A nucleotide consists of ____
a. a five carbon sugar, a nitrogenous acid, and a phosphate group b. a six carbon sugar, a nitrogenous base, and a phosphate group c. a five carbon sugar, a nitrogenous base, and a phosphate group d. a six carbon sugar, a nitrogenous acid, and a phosphate group e. a four carbon sugar, a nitrogenous acid, and a phosphate group
A loopful of bacteria containing 1000 bacterial cells is inoculated into a nutrient broth and incubated. After a negligible lag phase, the culture goes into exponential growth for two hours. The generation time for the bacterium is fifteen minutes. Which equation is the correct one to determine the number of cells present after two hours of log phase growth?
A. 1000 X 28 B. 1000 X 2 X 2 X 15 C. 1000 X 22 D. 1000 X 16
What is the main component of an animal cell membrane?
A. phospholipids B. polynucleotides C. aquaporins D. glycolipids E. cholesterol
The inner cell mass, which is formed when the blastula rearranges into two layers, will go on to become what?
a. myometrium b. endometrium c. embryo d. placenta