__________ are multicelled heterotrophs with
unwalled cells. Fill in the blank(s) with the appropriate word(s).
Answer: Animals
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What structural motif is most commonly used by transcription factors in binding to DNA?
A. Zinc-finger B. Helix-turn-helix C. Leucine zipper D. Homeodomain
Consider the metabolism of a chlorophyll-based phototroph. In oxidative phosphorylation during cell respiration, the source of energy is ________ whereas in photophosphorylation the source of energy is ________.
A. ATP; light B. highly reduced organic compounds; light C. NADH; NADPH D. electron transport chain; chlorophyll
The interaction of two or more polypeptide chains in a hemoglobin molecule is its ____ structure
a. primary b. secondary c. tertiary d. quaternary e. combined
Which of the following does NOT characterize tundra?
A. shrub B. trees C. permafrost D. caribou