Structure of DNA and RNA - Numerical Applications
Q. In a double helix, the two strands of DNA are held together by which type of bond?
-
A.
Covalent bond
-
B.
Hydrogen bond
-
C.
Ionic bond
-
D.
Disulfide bond
Solution
Hydrogen bonds between complementary nitrogenous bases hold the two strands of the DNA double helix together.
Correct Answer: B — Hydrogen bond
Q. What type of bond connects the sugar and phosphate groups in a DNA strand?
-
A.
Hydrogen bond
-
B.
Ionic bond
-
C.
Covalent bond
-
D.
Peptide bond
Solution
Covalent bonds connect the sugar and phosphate groups, forming the backbone of the DNA strand.
Correct Answer: C — Covalent bond
Q. Which of the following is NOT a component of a nucleotide?
-
A.
Phosphate group
-
B.
Nitrogenous base
-
C.
Amino group
-
D.
Deoxyribose sugar
Solution
An amino group is not a component of a nucleotide; nucleotides consist of a phosphate group, a nitrogenous base, and a sugar.
Correct Answer: C — Amino group
Q. Which technique is used to amplify a specific DNA segment?
-
A.
Gel electrophoresis
-
B.
Polymerase chain reaction (PCR)
-
C.
DNA sequencing
-
D.
Cloning
Solution
Polymerase chain reaction (PCR) is a technique used to amplify specific DNA segments.
Correct Answer: B — Polymerase chain reaction (PCR)
Showing 1 to 4 of 4 (1 Pages)
