One of the DNA-binding motifs in many eukaryotic organisms that contains a nearly identical sequence of 60 amino acids is known as the
A. homeodomain.
B. helix-turn-helix.
C. leucine zipper.
D. nonhelical zipper.
E. zinc finger.
Answer: A
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Milkweed plants produce a variety of defenses (such as leaf hair and latex-filled canals) to deter herbivores. How can monarch caterpillars circumvent these obstacles? Select all correct choices
A. by mowing hairs off of milkweed leaves B. by cutting the midvein that transports latex through leaves C. by creating channels to divert the flow of latex D. by metabolizing chemical compounds (cardenolides) produced by milkweeds
During a late-summer walk through a park, you notice a tree that has remnants of many flowers but no fruits or seeds developing. There are no other trees like this one in the area. What could explain this occurrence?
A) It is actually a gymnosperm, not an angiosperm. B) It is a female tree, and there are no known male trees of the same species in the area. C) It is a male tree with only male flowers that produce pollen, but no seed, and hence does not form fruit. D) It is a species that reproduces only by runners, not via fruits (or the seeds they contain).
The enzyme that catalyzes the formation of allolactose from lactose is:
A. galactoside permease. B. lactose isomerase. C. thiogalactoside tranacetylase. D. ?-galactosidase.
Teichoic acids are:
a. waxy substances that are found in some bacterial cell walls that make the cells re-sistant to toxic substances, including ac-ids. b. glycerol- or ribitol-phosphate polymers that are combined with various sugars, amino acids, and amino sugars, which are a part of the cell wall of gram-positive bacteria. c. high–molecular-weight polysaccharides that coat some bacterial cells and protect the bacteria from attack by cells of the human defense system. d. hairlike, proteinaceous structures that ex-tend from the cell.