During replication, which enzyme unwinds the DNA double helix?
A. DNA polymerase I
B. DNA helicase
C. DNA primase
D. DNA ligase
E. DNA gyrase
Answer: B
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A molecule of water in the middle of a chunk of ice will usually have ____ hydrogen bonds with other
water molecules.
a. 3 b. 3.4 c. 6 d. 4 e. 2
Which of the following polysaccharides is synthesized in the Golgi apparatus?
a. Pectin b. Cellulose c. Amylose d. Glycogen
The ability of the blood to transport oxygen is greatly reduced in individuals who have a dietary deficiency of this mineral
A) Sodium B) Calcium C) Potassium D) Zinc E) Iron
Which of the following drugs are likely to reduce blood pressure: (Select all that apply.)
a. An agonist of alpha and beta adrenergic receptors b. An antagonist of muscarinic receptors c. A drug that increases sodium excretion d. A drug that blocks calcium channels on myocardial cells