Balanced polymorphism explains why carriers of cystic fibrosis are relatively resistant to
A) malaria.
B) tuberculosis.
C) diarrheal illness.
D) pneumonia.
C) diarrheal illness.
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In contrast to chlorophylls, carotenoids function
A) as accessory pigments that enable absorption of energy from higher wavelengths. B) primarily as photoprotection (but they also transfer some absorbed energy into reaction centers). C) to convert reactive oxygen species into usable energy. D) to quench toxic oxygen species.
Answer the following statements true (T) or false (F)
1. Catabolic and anabolic reactions in living cells involve the transfer of electrons from one molecule to another in reduction-oxidation reactions. 2. Metabolism reflects only those reactions that yield energy. 3. The half-life of a molecule is the time it takes for 50% of the molecule to be broken down and recycled. 4. Autophagy is an important process that removes worn-out organelles, recycles components, then release them into the cytosol.
Which of the following sources of energy
powers the light-independent reactions of photosynthesis?
a. light b. ATP and NADPH c. photosystem 2 d. glucose e. NADP+
Refer to the accompanying figure. Reabsorption of water occurs at the point(s) labeled as:
a. 3 and 9.
b. 5 and 8.
c. 6 and 10.
d. 8 and 10.
e. only 10.