DNA replaced RNA as the main information
molecule probably because
a. DNA contains thymine and RNA does not.
b. DNA is double stranded and breaks less easily.
c. DNA can store more protein-building
instructions in less space.
d. RNA is highly unstable.
e. two of these are correct..
Answer: e
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Fungi feed through extracellular digestion and then absorption. How would the rates of decomposition of detritus be altered if fungicide (something that kills fungi) were sprayed on the forest floor?
A. Decomposition rates would be lowered because fungi would be destroyed. B. Decomposition rates would be higher because bacteria would take over the role of decomposition, and they reproduce at faster rates than fungi. C. Decomposition rates would be the same because fungi don't have hyphae above ground, so they would not be destroyed. D. Decomposition rates would be lowered because fungi would choose to grow in an area without fungicide.
Double fertilization occurs when
A. the sperm and tube nuclei fertilize the egg. B. two sperm cells fertilize the two polar nuclei. C. one sperm fuses with the egg and the other sperm fuses with both polar nuclei. D. the polar nuclei fuse with the egg after it has fused with the sperm.
Which of the fungi listed below will stay localized to the skin surface and will not invade and spread?
A. Candida spp. B. Sporothrix schenckii C. Blastomyces dermatitidis D. Trichophyton spp.
The primitive streak in a bird is the functional equivalent of _____
A) the lip of the blastopore in the frog B) the archenteron in a frog C) the notochord in a mammal D) neural crest cells in a mammal