Which of the following catalyzes the unwinding of the DNA double helix during DNA replication?
a. topoisomerase
b. primase
c. DNA polymerase
d. helicase
e. DNA ligase
D
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In a population of Mendel's garden peas, the frequency of the dominant A (yellow flower) allele is 80%. Let p represent the frequency of the A allele and q represent the frequency of the a allele
Assuming that the population is in Hardy-Weinberg equilibrium, what are the genotype frequencies? A. 64% AA, 32% Aa, 5% aa B. 50% AA, 25% Aa, 25% aa C. 16% AA, 40% Aa, 44% aa D. 75% AA, 15% Aa, 10% aa E. 80% AA, 10% Aa, 10% aa
Lipids, proteins, DNA, RNA, and complex carbohydrates are all ____
a. minerals b. atoms c. cells d. molecules e. elements
Animals that are hermaphroditic usually
a. fertilize their own eggs. b. cross-fertilize. c. donate eggs to other individuals. d. cannot reproduce sexually. e. fit all of these descriptions
Although a nonhuman reservoir for Helicobacter pylori has not been identified, it is considered a direct contact disease because
a. it occurs in clusters in certain areas. b. it predominates in families. c. it is related to food ingestion. d. it occurs in clusters and predominates in families.