Molecular Basis of Inheritance

Statement I: The two strands of DNA are parallel to each other with both the strands running in 3’ → 5’ direction.

Statement II: Complementary base pairing between Adenine with guanine and cytosine with thymine is present in DNA.

• Both the statements are correct.

• Statement I is correct, while statement II is incorrect.

• Statement I is incorrect, while statement II is correct.

• Both the statements are incorrect.

Lac operon

• Is associated with anabolic process

• Is a repressible operon

• Has three structural genes

• Is constituted by five structural genes

Which of the following region(s) does not code for any proteins?

(i) Introns

(ii) Exons

(iii) VNTRs

• Only i and iii

• Only ii and iii

• Only i

• All i, ii and iii

Find out the wrongly matched pair with respect to lac operon.

• Inducer – Lactose

• Lac z – codes for repressor protein

• Presence of glucose – Switches off the lac operon

• Repressor protein – Negative control of lac operon

tRNA is present corresponding to each of the following specified codons, except the codon

• UUU

• UGG

• AUG

• UGA

Switching the position of promoter with terminator will cause all of the following variation, except the

• Change in nucleotide sequence of coding and template strands

• Change in the polarity of coding and template strands

• Change in the nucleotide sequence of transcribed RNA

• Change in the sequence of amino acids in synthesized

RNA polymerase I, transcribes all the given types of RNA, except

• 5.8 s rRNA

• 18 s rRNA

• 5 s rRNA

• 28 s rRNA

Splicing is one of the steps of post-transcriptional modifications which occurs in

• Nucleus

• Cytoplasm

• ER

• Ribosomes

Read the given statements and select the correct option.

Statement I: Prokaryotes have single origin of replication in their genome.

Statement II: QB bacteriophage has RNA as their genetic material.

• Only statement I is incorrect

• Only statement II is incorrect

• Both statement I and II are correct

• Both statement I and II are incorrect

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?

• 11

• 33

• 333

• 1