Explain how the complementary strands of DNA are held together
A) They are held by ionic bonds.
B) They are held by complementary base pairing; adenine to thymine and guanine to cytosine.
C) They are held by complementary base pairing; adenine to cytosine and thymine to guanine.
D) They are held by complementary base pairing; adenine to guanine and thymine to cytosine.
E) They are held by complementary base pairing; adenine to adenine, thymine to thymine, guanine to guanine, and cytosine to cytosine.
Answer: B
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Fill in the blank(s) with the appropriate word(s).
Which vessel has a wall that is about 3/4 smooth muscle and thick external and internal laminae?
A. Large vein B. Conducting artery C. Distributing artery D. Muscular venules E. Medium vein
Match each term with its definition or description.
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A) head B) tail C) neck D) body E) None of the answers are correct.