Question 1. DNA replication is semiconservative. Which does this mean?

Each new DNA double helix consists of two old strands.

Each new DNA double helix consists of one old strand and one new strand.

Each new DNA double helix contains 25% of the old DNA double helix.

Each new DNA double helix consists of two new strands.

One new DNA double helix consists of two old strands, and the other new DNA double helix consists of two new strands.
Question 2. Which of the following gives the correct order of the steps involved in translation?Initiation, codon recognition, peptide bond formation, translocation, termination

Initiation, translocation, codon recognition, peptide bond formation, termination

Initiation, codon recognition, translocation, peptide bond formation, termination

Initiation, peptide bond formation, codon recognition, translocation, termination

Initiation, peptide bond formation, translocation, codon recognition, termination
Question 3. Which enzyme is needed for elongation of the RNA molecule during transcription?

RNase

RNA gyrase

RNA helicase

RNA ligase

RNA polymerase
Question 4. Which do you call the specific traits of an organism?

Holotype

Genotype

Typology

Phenotype

Morphology
Question 5. Which is the normal role of proto-oncogenes in the cell?

Cell growth

Cell suicide

Cell division

Transcription of RNA polymerase

Cell repair
Question 6. Which of the following is the most potent carcinogen?

Air pollution

Alcohol

UV radiation

Table salt

Dietary fat

Question 7. The genes responsible for the breakdown of lactose in E. coli are part of a(n) _____.

operon

activator

promoter

exon

regulatory gene
Question 8. Which of the following is an example of a transgenic organism?

An organism carrying a gene that was acquired by artificial means

The first organism in which a particular mutation has appeared

An organism carrying genes from two different parents

A cloned organism carrying two different alleles

An organism that gestated in an artificial womb
Question 9. A microbiologist wants to make bacteria produce a foreign protein. He has cloned the protein gene into a plasmid. Which is the next step?

The plasmid is inserted into the main bacterial chromosome.

The plasmid multiplies and produces the protein outside of the bacterium.

The bacterial chromosome should be genetically engineered. The plasmid is just used to help the bacterium replicate.

The plasmid is taken up by the bacterium, the plasmid replicates, and the protein is produced inside the bacterium.

The bacterial genome and the plasmid are inserted into the genome of the species that contains the desired gene.
Question 10. How would you describe a transgenic animal?

An animal that is the first of its kind to bear a particular allele

An animal in which a genetic defect has been corrected using recombinant DNA therapy

An animal containing a gene from a third parent, which may even be another species

An animal containing genes from both its parents

An animal containing genes from three or more species.