What is the main role of the pigment molecules within the antenna or light-harvesting complex?
A. Oxidize water and release oxygen to the reaction center chlorophyll.
B. Absorb photons and transfer light energy to the reaction center chlorophyll.
C. Synthesize NADPH.
D. Pass electrons to the electron transport chain and then to NADPH.
E. Increase H+ concentration in the stroma.
B. Absorb photons and transfer light energy to the reaction center chlorophyll.
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Which of the following characteristics separates primates from other mammals?
A. Primates are all placental animals, whereas other mammals are not. B. Primates all have opposable thumbs, whereas other mammals do not. C. Primates have nails instead of claws. D. Primates can regulate their body temperature. E. Primates are the only mammals that have eyes on the front of the face.
Why would bacteria evolve so that the presence of tryptophan inhibits its own production?
A. High levels of tryptophan causes cells to become unresponsive to external stimuli, so its production must be regulated. B. Producing high levels of tryptophan inhibits the production of other amino acids, so inhibiting its production allows all amino acids to be synthesized at equal concentrations. C. Producing the enzymes that synthesize tryptophan is metabolically expensive, so it is wasteful to make them when tryptophan levels are high and its synthesis is not necessary. D. High levels of tryptophan inhibit cellular respiration and the synthesis of ATP, so its production must be regulated. E. All of the answers are correct.
Refer to the figure above. Which of the structures in the figure causes the two strands of DNA to separate?
A) A B) B C) C D) D
The enzyme that synthesizes messenger RNA from a DNA template is
A) DNA polymerase. B) RNA polymerase. C) reverse transcriptase. D) ligase.