1.
Which of the following statements about the
structure of DNA is incorrect?
A. One complete turn requires 3.4 nm and 10 base pairs
B. The backbones of each strand run in opposite directions relative to each other
C. Each pair of nucleotides is held together by three hydrogen bonds
D. The width of the molecule is a constant 2 nm
A. One complete turn requires 3.4 nm and 10 base pairs
B. The backbones of each strand run in opposite directions relative to each other
C. Each pair of nucleotides is held together by three hydrogen bonds
D. The width of the molecule is a constant 2 nm
2.
What is the effect of the enzyme DNA ligase?
A. DNA is broken up at specific sites
B. DNA fragments are joined together
C. DNA replication occurs
D. DNA transcription occurs
A. DNA is broken up at specific sites
B. DNA fragments are joined together
C. DNA replication occurs
D. DNA transcription occurs
3.
Biochemical analysis of a sample of DNA shows
that cytosine forms 40% of the nitrogenous bases.
Which percentage of the bases is adenine?
A. 10%
B. 20%
C. 40%
D. 60%
Which percentage of the bases is adenine?
A. 10%
B. 20%
C. 40%
D. 60%
1.C
2.B
3.A
No comments:
Post a Comment