Bush beans grow as small bushes rather than as vines because their internodes are short and they branch close to the apical meristem. Which substance, if applied to a bush bean, might cause it to elongate its internodes and grow as a vine?
A) a cytokinin
B) a gibberellin
C) abscisic acid (ABA)
D) ethylene
Answer: B
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The limitation on microbial growth rate at high nutrient levels is/are
A. the saturation of the transport proteins for nutrient uptake. B. the rate of protein synthesis. C. the rate of DNA replication. D. All of the choices are correct.
Which of the following occurs in meiosis but not in mitosis?
A) chromosome replication B) synapsis of chromosomes C) production of daughter cells D) alignment of chromosomes at the equator E) condensation of chromosomes
There is a population of beetles that typically have black wings. A scientist studying these beetles knows that their eggs hatch in early spring, the young insects grow through the late spring and summer, they lay eggs in the early fall and they die in the early winter. Recently some beetles have been born with white wings. Early in life, the black- and white-winged beetles seem to be very similar in number of mating events, eggs laid, and survival rates, but shortly after laying their eggs the white beetles die and there are only black-winged beetles during the late fall. Which of the following is a true statement about the beetles?
A) White- and black-winged beetles have equal fitness. B) Black-winged beetles have a higher fitness than white-winged beetles. C) The number of baby white-winged beetles will decrease in frequency over time. D) White wings are an adaptation.
Which of the following is NOT a typical cellular change that occurs during lung cancer?
A. cellular hyperplasia B. loss of ciliated cells C. cellular displasia D. elevated gas transport E. increases in basal cell number and thickening of epithelium