Question 1
Identify the nitrogenous base shown in the image below.
- A) Adenine
- B) Thymine
- C) Uracil
- D) Guanine
Question 2
The image below shows the structure of a DNA molecule, identify the bonds represented by dashed lines.
- A) Covalent bonds
- B) Ionic bonds
- C) Phosphodiester bonds
- D) Hydrogen bonds
Question 3
Which of the following statements apply to both DNA and RNA?
I. Contain nucleotides as their building blocks.
II. Adenine (A) pairs with uracil (U).
III. Can fold into complex three-dimensional structures.
IV. Undergoes semi-conservative replication during cell division.
- A) I and IV
- B) II only
- C) I, III, and IV
- D) I and III
Question 4
If a DNA strand contains 20% adenine (A), what percentage of guanine (G) will it contain?
- A) 20%
- B) 30%
- C) 40%
- D) 50%
Question 5
Which of the following statements about the Watson-Crick model of DNA is NOT correct?
- A) It proposed a double helix structure for DNA.
- B) It suggested that adenine (A) pairs with thymine (T) through two hydrogen bonds.
- C) It proposed that guanine (G) pairs with cytosine (C) through three hydrogen bonds.
- D) It accurately described the role of DNA in protein synthesis.