Question 1
pts
In DNA, adenine always pairs with .
Correct!
Thymine
Guanine
Uracil
Cytosine
Both A and B
Question 2
pts
DNA is built from which of the
following? Nucleosides
Genes
Purines
Correct!
Nucleotide
Codons
Question 3
pts
The double helix of DNA is stabilized mainly by .
Ionic bonds
Covalent bonds
Ion-dipole bonds
Correct!
Hydrogen bonds
Hydrogen covalent bonds
,Question 4
pts
Which of the following pentose sugars is a constituent of DNA?
Xylose
Ribitol
Correct!
2-deoxyribose
Arabinose
Ribose
Question 5
pts
Pyrimidines have ring(s), (each) containing nitrogen(s), whereas purines have
ring(s), (each) containing nitrogen(s).
1; 1; 1; 1
Correct!
1; 2; 2; 2
2; 2; 1; 2
2; 1; 1; 2
2; 2; 1; 1
Question 6
pts
Identify the base guanine from among the following structures.
, A.
B.
C.