Which set of the following events occurs during the elongation step of translation?
P. Attachment of mRNA with the smaller subunit of ribosome
Q. Loading of correct aminoacyl-tRNA into the A site.
R. Formation of a peptide bond between the amino acyl-tRNA in the A site and the peptide chain that is attached to the peptidyl-tRNA in the P site.
S. Dissociation of the ribosomal subunits.
T. Translocation of peptidyl-tRNA from the A site to the P site of the ribosome.

RNA is very much susceptible to hydrolysis in alkali because

A. It contains uracil residues in its structure

B. its 2'-OH group participate in intramolecular cleavage of phosphodiester backbone

C. Cleavage occurs in the glycosylic bonds of purine bases

D. Cleavage occurs in the glycosylic bonds of pyrimidine bases

Rho-dependent and rho-independent transcription termination mechanisms operate in prokaryotes. Rho independent termination mechanism involves

A. Binding of the rho protein upstream of the termination element

B. No protein factors and only RNA secondary structure and run of 'U's

C. Presence of UGA or UAA stop codons

D. Binding of accessory factors at termination signal

Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: Cytoplasmic male sterility (cms) is invariably due to defect(s) in mitochondrial function.
Reason: cms can be overcome by pollinating a fertility restoring (Rf ) plant with pollen from a non cms plant.

A. Both (A) and (R) are true and (R) is the correct reason for (A)

B. Both (A) and (R) are true and (R) is not the correct reason for (A)

C. (A) is false but (R) is true

D. (A) is true but (R) is false

Mobile genetic elements present in human genome are
P. Long interspersed elements (LINEs)
Q. Short interspersed elements (SINEs)
R. P elements
S. IS elements

A. Q, R

B. P, Q

C. P, R

D. Q, S