The conversion of ammonium to nitrate could be accomplished by the presence of
A.
Nitrosomonas alone.
B.
Nitrobacter alone.
C.
Anabaena alone.
D.
both Nitrosomonas and Nitrobacter.
D
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The synthesis of the daughter strand of DNA occurs away from the replication fork in the leading strand
Indicate whether the statement is true or false
Most of the carbon dioxide in the blood is transported:a
dissolved in plasma. b. as bicarbonate ions. c. by hemoglobin. d. as carbonic anhydrase. e. as carbonic acid.
Which of the following body parts is surrounded by a mucous membrane?
A. cavities of freely movable joints B. abdominal cavity C. heart D. ovaries E. tubes of the digestive system
All cells contain
a. cytoplasm. b. a cell wall, nucleus, and cytoplasm. c. DNA, plasma membrane, and cytoplasm. d. mitochondria, plasma membrane, and cytoplasm.