The activity of a repressor depends on whether:

1. The repressor is positioned next to the operon
2. The repressor is positioned next to the promoter
3. A key substance in the metabolic pathway is present
4. There is enough RNA polymerase present

An operon is a:

1. Protein that suppresses gene expression
2. Protein that accelerates gene expression
3. Genes that switch other genes on or off
4. Cluster of structural genes with related functions

The wobble effect is the:

1. Lack of precision with regard to the third base in the codon and anticodon
2. Instability of the DNA molecule when unwound
3. Instability of pairing when a purine pairs with another purine
4. Undulating movements of mRNA

Which of the following was presented as evidence in favor of “the RNA world” hypothesis?

1. The fact that DNA can encode genetic information

2. The fact that enzymes, made of protein, can catalyze biological reactions

3. The discovery that some enzymes are composed of RNA rather than protein

4. The discovery of new life forms that encode their genetic information in RNA rather than DNA

The experimental proof for semiconservative replication of DNA was first shown in a:

1. Fungus

2. Bacterium

3. Plant

4. Virus

Select the correct match:

1. Alec Jeffreys – Streptococcus pneumoniae

2. Alfred Hershey and Martha Chase – TMV

3. Matthew Meselson and F. Stahl – Pisum sativum 

4. Francois Jacob and Jacques Monod – Lac operon 

Select the correct Match:

1. Ribozyme - Nucleic acid

2. F2 × Recessive parent - Dihybrid cross

3. T.H. Morgan - Transduction

4. G. Mendel - Transformation

AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?

DNA replication in bacteria occurs:

1. Within nucleolus

2. Prior to fission

3. Just before transcription

4. During S phase