Question

Identify the single most correct choice:

Select one:

a. SD (Shine-Dalgarno) sequence signals the presence of a gene on the chromosome.

b. Usually, microwaves kill microorganisms by forming highly reactive hydroxyl radicals.

c. Yeast can tolerate high osmotic pressure better than bacteria.

d. anticodon is a form of an antibody made against an antigen.

Answer 1

Ans) The correct answer is "C" i.e yeast can tolerate high osmotic pressure better than bacteria.

Option A is incorrect. Shine dalgarno sequence is involved in translation. It is purine rich sequence present upstream of AUG start codon and it ensures that the AUG is in correct position within the ribosome when the 16s rRNA component of the ribosome base pairs correctly with the shine dalgarno sequence.

Option B is incorrect. Gamma rays and UV rays are mainly used for surface sterilization purpose. These rays can create pores in the bacterial membrane and can disrupt their DNA,cell membranes and can also induce mutations in them which finally results in their death.

Option D is incorrect because anticodons present on the tRNA base pair complementarily with the codons present on the mRNA. There is no relation of anticodon in immunology or immune response.