Why are scientists debating if viruses are living organisms?
a. They infect other pathogens.
b. They are so small.
c. They are metabolically inert.
d. They don't always have DNA.
e. They live inside a host.
Answer: c. They are metabolically inert.
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Multiple functional groups are able to attach to macromolecules. What is the most useful characteristic that enables the attachment of multiple functional groups?
A. One hydrogen ionic bond. B. Four carbon covalent bonds. C. Two oxygen covalent bonds. D. Three nitrogen ionic bonds.
Microevolution involves ___
A. changes to the number of individuals in a population. B. changes in a population's gene pool. C. a change in the ratio of males to females in a population. D. the fixation of an allele over a long period of time.
Which statement describes a primary mutant screen?
A) A researcher uses CRISPR to create mutations in mouse homologs of three genes that function in heart development in the fruit fly. B) A scientist uses RNAi to simultaneously knock down the expression of two genes in C. elegans to determine whether they function redundantly. C) A scientist examines a large number of mutagenized zebrafish embryos for abnormalities in blood vessel formation. D) A researcher treats a large number of Arabidopsis plants with different chemicals to determine which chemicals inhibit plant growth.
Neutral mutations tend to accumulate in DNA at a predictable rate; like the ticks of a(n) __________, they can help
researchers estimate how long ago two lineages diverged. Fill in the blank(s) with the appropriate word(s).