Extraembryonic membranes arise from the
a. embryonic disk.
b. blastula.
c. placenta.
d. gastrula.
e. morula.
A
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_____ atoms give organic molecules their overall shape; _____ atoms determine the overall chemical behavior of organic molecules
A) Carbon; H, N, and O B) Hydrogen; C, N, and O C) Carbon; H2O D) H, N, and O; carbon
Photosynthesis occurs in
a. leaves. b. roots. c. stems. d. More than one of these answers is correct
Mendel's work on the transmission of genes in pea plants is applicable to ____
A. only pea plants B. plants and some animals but not humans C. all plants, but only plants D. all plants and animals, including humans E. all organisms
In your genetics lab, you are following the expression of a given gene. In your experiment, you add acetyltransferase to a sample of DNA that contains your gene. Which of the following would you expect to see in your results, assuming you have the techniques to determine the possibilities?
a) Histones would become more positive which causes the chromatin to tighten for more gene expression. b) Histones would become less positive which causes the chromatin to tighten for more gene expression. c) Histones would become less positive which causes the chromatin to loosen for more gene expression. d) Histones would become less positive which causes the chromatin to loosen for less gene expression. e) Histones would become more positive which causes the chromatin to loosen for more gene expression.