Transcription of lac y, lac z, lac a genes occurs.

Repressor is unable to bind to the operator.

Repressor is able to bind to the operator.

Both (a) and (b) are correct.

Protein that suppresses gene expression

Protein that accelerates gene expression

Cluster of structural genes with related function

Gene that switched other genes on or off

Replication begins at a single origin of replication.

Replication is bidirectional from the origins.

Replication occurs at about 1 million base pairs per minute

There are numerous different bacterial chromosomes, with replication occuring in each at the same time.

Unwinding of DNA molecule occurs as hydrogen bonds break.

Replication occurs as each base is paired with another exactly like it

Process is known as semi conservative replication because one old strand is conserved in the new molecule.

Complementary base pairs are held together with hydrogen bonds

Transcription, Translation, Replication

Transcription, Replication, Translation

Duplication, Translation, Transcription

Replication, Transcription, Translation

Origin of replication occurs only at the 5' end of the molecules

DNA ligase works only in the 3' → 5' direction

DNA polymerase can join new nucleotides only to the 3' end of the growing stand.

Helicases and single-strand binding proteins that work at the 5' end

One high and one low density band

One intermediate density band.

One high and one intermediate density band.

One low and one intermediate density band

3.5 million

35000

35 million

3.1 billion

Thymine as a nitrogen base

A single-stranded helix shape

Nucleotide containing sugars, nitrogen bases and phosphates

The same sequence of nucleotides for the amino acid phenyl alanine

Protein gets into the bacterial cells

DNA is the genetic material

DNA contains radioactive sulphur

Viruses undergo transformation