What makes certain red algae appear red?
A) They live in warm coastal waters.
B) They possess pigments (phycoerythrin) which reflects and transmits red light.
C) They use red light for photosynthesis.
D) They lack chlorophyll.
E) They contain the water-soluble pigment anthocyanin.
Ans: B) They possess pigments (phycoerythrin) which reflects and transmits red light.
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Birds are able to sustain long flights at high altitudes because they
A) can extract oxygen during both inhalation and exhalation. B) decrease their heart rate during flight. C) use anaerobic metabolism during flight. D) have thicker blood than other animals, with many more red blood cells. E) are able to lower their body temperature during flight.
Which organism is killed by atmospheric oxygen?
A. facultative anaerobe B. obligate aerobe C. obligate anaerobe D. aerotolerant anaerobe
Which of the following mechanisms normally repairs pyrimidine dimers?
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