The primary germ layers develop from the
A) placenta.
B) embryonic disc.
C) uterus.
D) morula.
B) embryonic disc.
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In meiosis, recombination occurs _______________
A. during prophase I and II and involves exchange of chromosome fragments between all four chromatids B. only during prophase I and involves exchange between chromatids of homologous chromosomes C. only during prophase I and involves exchange of chromosome fragments between sister chromatids D. during prophase I and II and involves exchange of chromosome fragments between sister chromatids
An enzyme catalyzes a substrate into a final product. When the concentration of the final product is high enough, it binds to a regulatory site on the enzyme
This binding at the regulatory site changes the shape of the enzyme, which prevents it from binding the substrate and prevents formation of more final product. This is an example of a(n) _______________. A. posttranslational modification B. allosteric enzyme C. translational repressor D. methylation
Polar bodies
a. are dumping places for excess genetic material. b. have no known biological function. c. are produced by meiosis. d. will serve as the gametes if something happens to the egg. e. all of these except "will serve as the gametes if something happens to the egg"
AZT and Valaciclovir are antiviral nucleoside analogs that interfere with
A. protein synthesis. B. cell wall synthesis. C. cell membrane component synthesis. D. nucleic acid synthesis. E. viral attachment.