Which of the following statements is NOT true about gamete formation in mammals?
A. In the female, the separation of cytoplasm
is unequal during meiosis.
B. Only one of the four cells resulting from
meiosis goes on to become an oocyte.
C. Only one of the four cells resulting from
meiosis goes on to become an egg, which
becomes a zygote upon fertilization by a
sperm cell.
D. The polar bodies formed during meiosis in
the female can participate in fertilization with
sperm.
E. The cytoplasm is diminished during
development of sperm, and a flagellum is
formed to give sperm locomotion.
D
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Termination of translation and release of the polypeptide chain occurs when
a. tRNA binds to a termination codon via a complementary anticodon but lacks an amino acid. b. a protein release factor binds to the termination codon. c. a tRNA with a complementary anticodon binds to a termination codon, and a release factor bound to the CCA end releases the chain. d. a small molecule shaped like puromycin binds to the termination codon.
Consider organism that are eukaryotic, are found in both unicellular and multicellular forms may resemble plants but are not photosynthetic, have chitin in their cell walls, and absorb organic nutrients from decomposing material in the environment. These organisms would be classified as which of the following types of organisms?
a. archaea b. bacteria c. protozoa d. fungi
The signs and symptoms of staphylococcal scalded skin syndrome are caused by
A) coagulase. B) lipase. C) beta-lactamase. D) exfoliative toxins. E) staphylokinase.
Cadherins ______________________
(a) are used to transfer proteins from one cell to another. (b) mediate cell–cell attachments through homophilic interactions. (c) are abundant in the plant cell wall. (d) bind to collagen fibrils.