Many sponges produce both eggs and sperm and thus are
(a) monoecious.
(b) dioecious.
(c) hermaphroditic.
(d) both a and c.
(d) both a and c.
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Molecular evidence points to __________ as an
explanation for the great diversity of hormones and hormone receptors in vertebrates. a. polyploidy and nondisjunction b. gene duplications followed by mutations c. continental drift d. chromosomal translocations e. homeotic genes
Recombinant DNA technology
a. uses bacteria to make copies of the desired product. b. splices DNAs together. c. is possible only between closely related species. d. uses bacteria to make copies of the desired product and splices DNAs together. e. uses bacteria to make copies of the desired product and splices DNAs together, but is possible only between closely related species.
Which of the following is generally NOT considered an ethical issue regarding recombinant DNA technology?
A) the modification of crop plants B) screening of humans for genes that predispose them to disease C) unforeseen impact on the environment D) the modification of animals to produce pharmaceuticals for humans E) answering basic research questions
Adenosine—uridine-rich elements are ________
A) cis-acting elements where ribosomes bind to in order to initiate translation B) trans-acting elements that block mRNA splicing C) trans-acting elements that bind to mRNA to recruit ribosomes to mRNA for translation initiation D) trans-acting elements that bind to mRNA to either degrade or stabilize mRNA E) cis-acting elements that recruit RNA-binding proteins to mRNA to either degrade or stabilize the mRNAs