Viral DNA is replicated by:
a. viral DNA.
b. conjugation.
c. bacterialDNA.
d. using the host's metabolic machinery and energy.
Ans: d. using the host's metabolic machinery and energy.
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A histone code is:
A. the nucleotide sequence of an individual histone protein's gene. B. the pattern of chemical modification of the DNA wrapped around an individual histone. C. the pattern of chemical modification of an individual histone's tail. D. the number of lysines in an individual histone that are methylated. E. None of the answer choices are correct.
A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose, readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane?
A. The artificial membrane lacked a protein needed for glucose transport. B. The artificial membrane lacked the appropriate types of phospholipids for glucose transport. C. Oxygen readily passes through the membrane, so glucose should have as well. D. The membrane lacked an adequate amount of amphipathic molecules for glucose transport. E. Thermodynamics does not allow glucose to pass through membranes produced either artificially or from living organisms.
In angiosperms, double fertilization
A. must happen to the pollen, forming the male gametophyte, and also to the egg, forming the female gametophyte. B. happens in the eudicot group of plants with two cotyledons. C. is a pairing of fertilization events, with one forming the sporophyte and the other forming the gametophyte. D. results in the diploid zygote, and the triploid endosperm. E. produces the four microspores in the male, and the four megaspores in the female.
A scientist is studying the flow of energy into and out of a rain forest as well as the usage of energy by the organisms that inhabit that area. This study would be at the level of a(n)
A) population. B) biosphere. C) community. D) species. E) ecosystem.