What is the ecological significance of shallow bays and coastal wetlands such as estuaries and salt marshes?
A) Coral reefs occur in these areas.
B) They are an important source of crude oil.
C) They serve as the habitat for many endangered species.
D) They are the breeding grounds for a wide variety of sea-dwelling animals.
E) They are safe from most human impact because humans do not live there.
D
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Which of the following enzymes is responsible for specifically transcribing tRNA in eukaryotic cells?
A) RNA polymerase I B) RNA polymerase II C) RNA polymerase III D) primase E) RNase H
The analysis of energy flow in an aquatic ecosystem in Silver Springs, Florida revealed that ____
a. energy flows are difficult to measure b. most of the sun's energy is harvested c. only a little energy is transferred from one trophic level to the next d. the energy flow in carnivores is equal to that of producers e. trophic energy losses are not significant
A base-pair substitution may alter a protein by changing an amino acid or by introducing a(n) _____________________.
Fill in the blank(s) with the appropriate word(s).
What kinds of angiosperms have reverted to wind pollination?
A. grasses B. oaks C. birches D. All of these are correct.