In the scientific method, hypotheses lead most directly to:
A. predictions
B. theories
C. experiments
D. observations
E. conclusions
Answer: A
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One of the most pathogenic hemorrhagic fever viruses belongs to the _________ family
a. Filoviridae b. Flaviviridae c. Papovaviridae d. Picornaviridae
A substance that promotes binding of Rhizobium to plant root hairs is called a ________ factor.
Fill in the blank(s) with the appropriate word(s).
What accounts for the fact that polydactylism is prevalent and Tay-Sachs disease virtually absent in
one human population in the United States, while Tay-Sachs disease is prevalent and polydactylism virtually absent in another? a. Natural selection has promoted these differences since humans live in many different environments. b. Mutation rates differ between different loci. c. There is little gene flow between the two populations. d. The populations are small, and therefore genetic drift is a major factor in the determination of allele frequencies. e. Genetics is an unpredictable science.
A primary difference in the age pyramids of industrialized versus developing countries is that:
a. third-world countries show a characteristic "bulge" that indicates a baby boom. b. third-world countries have significantly more individuals than industrialized countries. c. third-world countries have much larger proportions of their population in the youngest age group.