The CRISPR-Cas9 system uses all except which of the following?
A) replacement DNA to be inserted at the cut site
B) a guide RNA which locates the gene to be edited
C) prokaryotic or eukaryotic cells to be edited
D) an enzyme to cut both strands of DNA at the target site
E) reverse transcriptase enzyme
Answer: E
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The non-adaptive mechanisms of evolutionary change are:
A. migration (gene flow), mutation, and genetic drift. B. migration (gene flow), balancing selection, and genetic drift. C. migration (gene flow), sexual selection, and genetic drift. D. mutation, sexual selection, and genetic drift. E. mutation, genetic drift, and heterozygote advantage.
A researcher knows the geographic range of a population of butterflies. Given only this information, what else can she deduce about this butterfly population?
A. the size of the butterfly population B. the density of the butterfly population C. the parasites/predators that these butterflies may encounter D. the age structure of the butterfly population E. the intrinsic growth rate of the butterfly population
List the steps associated with the pressure-flow model of phloem transport.
What will be an ideal response?
Which of the following statements about lipids is FALSE?
a. They are hydrophobic. b. They are composed of C and H atoms linked by nonpolar covalent bonds. c. They are soluble in water. d. There are four major groups of lipids.