Mutation and migration introduce new alleles into populations. What is the most likely principal force that will shift allelic frequencies within large populations?
What will be an ideal response?
natural selection
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Seed-producing plants first evolved ____
a. on land b. in freshwater c. in the ocean d. in estuaries e. from red algae ancestors.
How does resistance to drugs spread in bacterial populations?
A) Exposure to drugs causes mutations in bacterial genes. B) Horizontal gene transfer between bacteria spreads R (resistance) plasmids. C) Genetic recombination during sexual reproduction. D) Exposure to drugs induces immunity. E) Exposure to drugs alters gene expression in bacteria.
Something that is administered to members of at least one participating group is known as the:
A. potential outcome. B. average treatment effect. C. treatment. D. treatment effect.
When substrate-level phosphorylation occurs, it means that:
A. NAD+ is converted into NADH. B. ADP is converted into ATP by the addition of a phosphate group. C. ATP is converted into ADP plus a phosphate group. D. NADH is converted into NAD+ plus a proton.