The toxin of Vibrio cholerae causes profuse diarrhea because it _____
A) modifies a G protein involved in regulating salt and water secretion
B) binds with adenylyl cyclase and triggers the formation of cAMP
C) signals IP3 to act as a second messenger for the release of calcium
D) modifies calmodulin and activates a cascade of protein kinases
A
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Genomic DNA sequences seem to support the idea that the first eukaryotic cell arose from within the ________ lineage.
A. bacterial B. last universal common ancestor (LUCA) C. viral D. archaeal
What is the most likely way a mutation in one gene can convert one body part to another?
A) The mutated gene encodes a protein that affects the expression of many other genes. B) The mutated gene encodes a protein that determines cell shape. C) The mutation is in a structural gene and results in production of more protein than usual. D) A mutation in only one gene cannot convert one body part to another.
In angiosperms, pollen is the product of a haploid microspore dividing mitotically. Therefore, pollen is
A. a sporophyte. B. a seed. C. a gametophyte. D. a spore. E. sperm.
The graph above displays results from subjects in a study who responded to a questionnaire on character and temperament. The subjects had a known genotype for the DRD4 gene (associated with novelty-seeking behavior). Results are shown for the CC group and the CT and TT genotypes as another group. In the graph, what do the light blue bars represent?
What will be an ideal response?