Which of the following statements is not true about DNA replication in eukaryotes?

(a)

Replication begins at a single origin of replication.

(b)

Replication is bidirectional from the origins.

(c)

Replication occurs at about 1 million base pairs per minute

(d)

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

The first codon to be deciphered was ______ which codes for ________.

(a)

AAA, proline

(b)

GGG, alanine

(c)

UUU, Phenylalanine

(d)

TTT, arginine

Meselson and Stahl’s experiment proved

(a)

Transduction

(b)

Transformation

(c)

DNA is the genetic material

(d)

Semi-conservative nature of DNA replication

An operon is a: ______.

(a)

Protein that suppresses gene expression

(b)

Protein that accelerates gene expression

(c)

Cluster of structural genes with related function

(d)

Gene that switched other genes on or off

When lactose is present in the culture medium:

(a)

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

(b)

Repressor is unable to bind to the operator.

(c)

Repressor is able to bind to the operator.

(d)

Both (a) and (b) are correct.