The analysis of viral nucleic acid reveals that it contains adenine 21%, guanine 31%, cytosine 23%, and some unexpected base 19%. What will be true for this virus?

I:	It probably uses RNA as its genetic material.
II:	The genetic material of this virus is probably single-stranded.
III:	Base pairing rules in this virus probably include adenine: cytosine.

 

1.	I and II only	2.	I and III only
3.	II and III only	4.	I, II and III

The bacterial DNA is mainly composed of:
1. Ori sequences.
2. Structural gene sequences.
3. Intergenic regions.
4. Introns.

All the following structures in a eukaryotic chromosome are composed of DNA except:

A genome will be best defined as:
1. All the information in plasmids of a bacterium.
2. A homologous pair of chromosomes.
3. The complete DNA sequences in a diploid zygote.
4. All the DNA contained in a human gamete.

When DNA is replicated the first nucleotides are added by:
1. DNA primase
2. DNA polymerase III
3. DNA polymerase II
4. DNA ligase

A deoxyribonucleotide contains:

Constitutive heterochromatin includes:
1. The Barr body.
2. A region of active gene expression.
3. Telomeres.
4. Both 1 and 2.

What key observation regarding Garrod'sinborn of metabolism leads to a landmark discovery in molecular biology?

Proof reading, the error-correcting processes, first proposed by John Hopfield and Jacques Ninio, during DNA replication takes place by:
1. Endonuclease cleavage.
2. Exonuclease cleavage.
3. Methylation.
4. An induced-fit phenomenon.

Identify the incorrect statement regarding structure of DNA:
1. Pitch is 3.4nm and 10 base pairs.
2. The two strands are antiparallel.
3. Each pair of nucleotides is held together by three hydrogen bonds.
4. The diameter of the molecule is a uniform 2nm.