The following is a simplified figure of the structure of a DNA molecule. The red
ID: 3507470 • Letter: T
Question
The following is a simplified figure of the structure of a DNA molecule. The red box on the figure encloses which component of DNA?
Select one:
a. Nitrogenous base
b. Deoxyribose
c. Ribose
d. Phosphate group
The following is a simplified figure of the structure of a DNA molecule. The type of bond enclosed by the red box on the diagram is:
Select one:
a. Hydrogen bond
b. Phosphodiester bond
c. Covalent bond
d. Ionic bond
Given the following DNA sequence, which correctly represents the sequence of the complementary strand: 5’ ATC GCT AAT 3’ ?
Select one:
5’ UAG CGA UUA 3’
5’ TAC CGA TTA 3’
3’ TAG CGA TTA 5’
3’ UAG CGA TTA 5’
A protein is 300 amino acids long. Which of the following is the complete number of nucleotides in the double-stranded region of DNA coding for this protein?
Select one:
300
1800
900
100
Explanation / Answer
The red box on the figure encloses a) nitrogenous base. DNA has two nitrogenous bases : purines consist of 2 carbon rings whereas pyrimidines have only one carbon ring. Purines are adenine and guanine. Pyrimidines are thymine and cytosine.
The type of bond is a) hydrogen bond. Adenine and thymine are attached with two hydrogen bonds whereas guanine and cytosine are attached with 3 hydrogen bonds.
The answer is c) 3' TAG CGA TTA 5' the complementary strands should be A with T and G with C.
300 amino acids represent b) 1800 codons. The DNA is double stranded and the code is triplet.
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