Flowers that have all four floral parts are said to be:
A. perfect
B. complete
C. whorled
D. finite
E. infinite
B. complete
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Which one of the following is a characteristic shared by integrins and cadherins?
A. Both are peripheral membrane proteins. B. Both facilitate the adhesion of cells to extracellular matrix proteins. C. Both are present in adherens junctions, desmosomes, and hemidesmosomes. D. The cytoplasmic domains of both proteins are connected to the cytoskeleton.
Sickle-cell disease is a disorder that is caused by
A. a single mutation on a single gene. B. a collection of mutations that span several different genes. C. a collection of genetic mutations and environmental factors. D. a collection of mutations on a single gene.
Because he was well aware of the effect his theory of evolution would have on the Church of England, Darwin delayed published his work for several decades while he gathered additional evidence. Which of the following lines of evidence did he use to support his theory?
A. Artificial selection can produce organisms that differ markedly from their wild ancestors, and island species around the world all appear to be related to each other. B. Adaptations to specific environments increase an organism's ability to survive an reproduce, and organisms seem to reproduce, and organisms seem to produce only as many offspring as the environment can support. C. All species are capable of producing more offspring than the environment can support, and artificial selection can produce organisms that differ from their wild ancestors. D. Some individuals leave more descedents than other individuals, but the individuals, but the individuals in a population are essentially identical to each other. E. None of the above
Which of the following would be selective against the tubercle bacillus?
A) bacitracin — inhibits peptidoglycan synthesis B) ethambutol — inhibits mycolic acid synthesis C) streptogramin — inhibits protein synthesis D) streptomycin — inhibits protein synthesis E) vancomycin — inhibits peptidoglycan synthesis