Biology posts:

1.Throughout which phase of mitotic cycle would DNA be present in the least amount in a nucleus?
A. Anaphase
B. Interphase
C. Metaphase
D. Telophase

2.At prophase of mitosis, a eukaryote chromosome consists of two chromatids.
What is the structure of a single chromatid?
A. One molecule of single stranded DNA coiled around protein molecules
B. Two molecules of single stranded DNA each coiled around protein molecules
C. One double helix of DNA coiled around protein molecule
D. Two double helices of DNA each coiles around protein molecules

3.If the nucleus of a human motor neurone contains 6.8 (pg) of DNA, what mass of DNA is the nucleus of an actively dividing human shin cell likely to contain at the end of interphase?
A. 3.4 pg
B. 6.8 pg
C. 13.6 pg
D. 20.4 pg

1.D

2.C  

3.C

Biology MCQs

1.Which one of the following is found in both DNA and messanger RNA?
A. Doublee helix structure
B. Ribose
C. Sugar-phosphate chain
D. Thymine

2. What is the advantage of DNA having two complementary strands?
A. Pairing can occur between chromatids
B. Transcription and replication can occur simultaneously
C. Semi-conservative replication is possible
D. Diploid cells can inherit DNA from both parents

3.The two pyrimidine bases most commonly found in DNA are
A. Uracil and thymine
B. Cytosine and uracil
C. Cytosine and thiamine
D. Cytosine and thymine

1.c

2.c

3.d

Biology MCQs

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

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

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%

1.C  

2.B

3.A