Lactose (Lac) operon is regulated by

• lac repressor only

• lac repressor and CAP-cGMP complex

• lac repressor and CAP-cAMP complex

• CAP-cAMP and CAP-cGMP complex

The enzyme peptidyl transferase of prokaryotes resides in

• 50 S ribosome

• 30 S ribosome

• 40 S ribosome

• 60 S ribosome

The tRNA anticodon 3'-UAC-5' will pair with the mRNA codon

• 5'-AUU-3'

• 5'-UAC-3'

• 5'-AUG-3'

• 3'-GUA-5'

Select the correct combination of statements for DNA fingerprinting,

I. It is ELISA based technique.

II. It is PCR based technique.

III. It is used by forensic scientists.

IV. It is based on the fingerprint of the individual.

V. It is a test for paternity

• I, II and III

• II, III and IV

• I, IV and V

• I, III and IV

Which of the following are not the functions of genes?

I. Cell division

II. Structure and metabolism control

III. Carrier of hereditary information

IV. Provide proof for crossing over

• I, II, III and IV

• I, III and IV

• I, II and III

• II, III and IV

206.

Read the following statements.

I. Satellite DNA is found in the region of euchromatin

II. Prokaryotes contain only non-repetitive DNA

Identify wheather the given statements are true or false

• Both the statements are true

• I is true and II is false

• I is false and II is true

• Both the statements are false

Select the option for correct pairing of nitrogenous bases in dsDNA.

• ^(Py)Adenine  = ^(Pu)Cytosine :: ^(Pu)Guanine = ^(Pu)Thiamine

• ^(Pu)Adenine $\equiv$ Thiamine^(Py) ::  ^(Py)Cytosine = ^(Py)Guanine

• ^(Py)Adenine $\equiv$ ^(Pu)Thiamine :: ^(Py)Cytosine $\equiv$ ^(Pu)Guanine

• Adenine^(Pu) = Thiamine^(Py) :: Guanine^(Pu) $\equiv$ Cytosine^(Py)

The translation unit is represented by the following diagram. Select the correct answer based on this

• Promoter/ Terminater/ Coding strand/ Structural gene

• Promoter/ Coding strand/ Terminator/ Structural gene

• Terminater/ Coding strand/ Structural gene/ Promoter

• Promoter/ Structural gene/ Coding strand/ Terminator

Given below are the set of statements describing the structural details of Purines (A) and Pyrimidines (BJ.

I. Nine - membered, double ring

II. Six - membered, single ring

III. Contains Nitrogen atoms at four positions

IV. Contains Nitrogen atoms at two positions

Segregate the statements I - IV into categories A and B and choose the correct option.

• A	B
  I, IV	II, III

• Only I

  Only IV

• Only II

  Only I

• I, III

  II, IV

Which type of RNA carries no coding message?

• mRNA

• tRNA

• rRNA

• tRNA and rRNA