Adaptive radiations can be a direct consequence of three of the following four factors. Select the exception.`
A) Vacant ecological niches
B) Genetic drift
C) Colonization of an isolated region that contains suitable habitat and few competitor species
D) An adaptive radiation in a group of organisms (such as plants) that another group could use as food
Ans: B) Genetic drift
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Exoskeletons are used for movement by which of the following animals?
A. insects B. cnidarians C. crustaceans D. humans E. insects and crustaceans
If a mutation prevented the formation of lignin,
which tissue would be most affected?
a. vascular cambium b. parenchyma c. collenchyma d. sclerenchyma e. all of these
Below are several phenomena relating to protein structure. Clearly describe each phenomenon, the conditions under which each occurs, and the probable influence each has on protein structure
(a) hydrophobic interactions (b) hydrogen bonds (c) disulfide bridges
Which of the following is true of both positive and negative gene regulation?
a. They directly reduce the rate of transcription of certain genes. b. They involve transcription factors (or RNA) binding to DNA. c. They involve transcription of all genes in the genome. d. They are not both active in the same organism or virus. e. They act away from the promoter.