Molecular Basis of Inheritance

m-RNA is synthesised on DNA template in which direction : -

1. Any
2. Both (3) and (4)
3. 5' → 3'
4. 3' → 5'

In Negative operon : -

1. cAMP has negative effect on lac operon
2. Co-repressor binds with inducer
3. Co-repressor binds with repressor
4. Co-repressor does not bind with repressor

Gene and cistron words are sometimes used synonymously because : -

1. One gene contains one cistron
2. One cistron contains many genes
3. One gene contains no cistron
4. One gene contains many cistrons

Types of RNA polymerase required in nucleus for RNA synthesis : -

1. 2
2. 3
3. 1
4. 4

A mutant strain of T4 bacteriophage, R-II, fails to lyse E. coli, but when two strains R-IIX and R-IIY are mixed, they lyse E. coli. What may be the possible reason?

1. Both strains have different cistrons
2. Both strains have similar cistrons
3. It is not mutated
4. Bacteriophage transforms into wild type

Method of DNA replication in which two strands of DNA separate and synthesize new strands

1. Conservative
2. Non conservative
3. Dispersive
4. Semiconservative

Which of the following is initiation codon?

1. AUC
2. CCU
3. UAG
4. AUG

Anticodon occurs in:

1. DNA
2. r-RNA
3. t-RNA
4. m-RNA

Length of one loop of B-DNA:

1. 20 nm.
2. 10 nm.
3. 3.4 nm.
4. 0.34 nm.

In three dimensional view the molecule of t-RNA is:

1. E-shaped
2. L-shaped
3. S-shaped
4. Y-shaped