Molecular Basis - 06-09-23

Some amino acids are coded by more than one codon hence the code is

• (a) unambiguous

• (b) degenerate

• (c) universal

• (d) initiator.

Ribosomal RNA is actively synthesized in

• (a) Lysosomes

• (b) Nucleolus

• (c) Nucleoplasm

• (d) Ribosomes

hnRNA is converted to mRNA by

• (a) Splicing

• (b) Capping

• (c) Tailing

• (d) All

Read the following statements and choose the correct option.

I. RNA polymerase associates transiently with ‘Rho’ factor to initiate transcription.

II. In bacteria, transcription and translation takes place in the same compartment.

III. RNA polymerase I is responsible for transcription of tRNA.

IV. When hnRNA undergoes capping process, adenylate residues are added at 3’ end in a template independent manner.

V. hnRNA is the precursor of mRNA.

• (a) II and V are correct

• (b) II, III and V are correct

• (c) III and IV are correct

• (d) I and IV are correct

Spliceosomes are not found in cells of;

• (a) Fungi

• (b) Animals

• (c) Bacteria

• (d) Plants

DNA replication in bacteria occurs:

• (a) Within nucleolus

• (b) Prior to fission

• (c) Just before transcription

• (d) During S phase

A gene is

• (a) composed of a chain of amino acids.

• (b) one of the four types of nucleotides found in DNA.

• (c) a portion of DNA in the chromosome that codes for a particular trait

• (d) All of the above

Which is a false statement?

• (a) cDNA is produced from mRNA.

• (b) cDNA lacks introns.

• (c) cDNA cannot be expressed outside a eukaryotic cell.

• (d) cDNA is much shorter than the concerned gene in the genome.

Which of the following correctly assigns the codons for glycine ?

• (a) GGG, GGC, GGA

• (b) AAA, AAG, AAC

• (c) AUG, AUA, AUC

• (d) CCC, CCG, CGA

The difference between ATP and the nucleoside triphosphates used during DNA synthesis is that

• (a) The nucleoside triphosphates have the sugar deoxyribose; ATP has the sugar ribose.

• (b) The nucleoside triphosphates ahve two phosphate groups; ATP has three phosphate groups.

• (c) ATP contains three high energy bonds’ the nucleoside triphosphates have two.

• (d) ATP is found only in human cells; the nucleoside tri phosphates are found in all animal and plant cells.