A student views some cheek cells under low power. Before switching to high power , the student should
a. adjust the eyepiece
b. center image being viewed
c. increase the magnification
d. remove the coverslip from the slide
Answer: b. center image being viewed
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Organisms in natural environments can be detected by assaying for the presence of their genes
Indicate whether the statement is true or false.
Which tissue acts to transport nutrients and wastes throughout the body?
a. blood b. adipose tissue c. loose connective tissue d. fibrous connective tissue e. cartilage
Most of the ocean's productivity occurs
a. in the open ocean. b. in the intertidal zone. c. in the neritic zone. d. near hydrothermal vents. e. in the benthic province
Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection? 1. Well-adapted individuals leave more offspring than do poorly adapted individuals. 2. A change occurs in the environment. 3. Genetic frequencies within the population change. 4. Poorly adapted individuals have decreased survivorship.
A. 2 ? 4 ? 3 ? 1 B. 2 ? 4 ? 1 ? 3 C. 4 ? 1 ? 2 ? 3 D. 4 ? 2 ? 1 ? 3 E. 4 ? 2 ? 3 ? 1