Beaked whales feed at various depths, but they defecate at the ocean's surface. Nitrogen-rich whale feces deposited in surface waters supply nutrients for algae that are eaten by surface-dwelling fish. Which of the following best predicts what would happen if the whale population decreased?
A) There would be a reduction in surface nitrogen concentration, which would cause an algal bloom
B) The surface fish populations would decline due to reduced populations of algae
C) The remaining whales would accumulate mutations at a faster rate
D) The remaining whales would be forced to forage in the deepest parts of the ocean
Answer: B) The surface fish populations would decline due to reduced populations of algae
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a. shrimp. b. swordfish. c. clams. d. oysters. e. salmon.
Certain groups of cells move inward from the surface of the blastula in a carefully orchestrated migration called
A. blastulation B. archenteron formation C. morula formation D. gastrulation E. cleavage
Why isn't bacterial DNA digested by the restriction enzymes bacteria produce?
A) The sequence recognized and cleaved by a restriction enzyme is not found in the bacterial genome. B) Bacterial cells have high concentrations of ligase which immediately repairs the any sites that are cleaved. C) Methyl groups added to the bases of restriction enzyme recognition sites within the bacterial chromosome block cleavage. D) Bacterial DNA is modified with phosphate groups that prevent the function of restriction enzymes. E) Restriction enzymes are found in the cytoplasm and DNA is only in the nucleus.
In order for something to be considered a skeleton, it must contain bone or some other hard substance.
Answer the following statement true (T) or false (F)