Which of the following statements about the DNA double helix is TRUE? Multiple C
ID: 171662 • Letter: W
Question
Which of the following statements about the DNA double helix is TRUE?
Multiple Choice
Complementary base pairing allows the production of a DNA strand that is identical to its template strand (or parts of the template strand) via DNA replication.
The 3' end of the double helix terminates in a nitrogenous base on the 3' carbon.
The 5' end of the double helix terminates in a nitrogenous base on the 5' carbon.
Complementary base pairing across the double helix allows information to be transferred via DNA replication.
It takes large amounts of energy to separate the double helix because it is held together via covalent bonds.
Explanation / Answer
Complementary base pairing allows the production of a DNA strand that is identical to its template strand (or parts of the template strand) via DNA replication.
This statement is true.
The 3' end of the double helix terminates in a nitrogenous base on the 3' carbon.
3' end of the double helix terminates in the 3'-OH ned of the deoxyribose sugar. so second statement is wrong
The 5' end of the double helix terminates in a nitrogenous base on the 5' carbon.
The 5' end of the double helix terminates in the 5'-OH of deoxyribose sugar. so this statement is wrong
Complementary base pairing across the double helix allows information to be transferred via DNA replication.
this statement is correct
It takes large amounts of energy to separate the double helix because it is held together via covalent bonds.
Energy for the unwinding of the double strand is required only during the initiation of replication. Also, double helix are joined to each other by H-bond, not by covalent bond so this statement is wrong
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