Which biome occurs where winter drought reduces photosynthesis and most trees drop their leaves?
a. tropical montane forests
b. tropical deciduous forests
c. boreal forests
d. dry savannas
e. temperate forests
ANSWER: b
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Predict the outcome of an F+ to F- mating if the F+ cell lacked a functional tra operon.
A. Conjugation would not occur because there would be no contact between the F+ and F- cells. B. Upon entering the recipient, the F factor would be unable to integrate into to host chromosome. C. Conjugation would occur, but the F- recipient could not become Hfr. D. There would be no effect on conjugation.
In a dihybrid cross, you want to calculate the probability that an F2 progeny of the cross will inherit both dominant phenotypes. Which of the rules of probability can be used to calculate the probability of obtaining that combination of alleles?
What will be an ideal response?
Which term most appropriately refers to a regulatory protein in prokaryotes?
A) RNA processing B) helicase activation C) DNA binding protein D) gyrase action E) translation
The archenteron of the developing frog eventually develops into which structure?
A) reproductive organs B) the blastocoel C) heart and lung D) digestive tract E) brain and spinal cord