51.

Which of the following is used as a best genetic vector in plants?

• Bacillus thurengiensis

• Agrobacterium tumifaciens

• Pseudomonas putida

• All of the above

Yersinia pestis is responsible for

• syphilis

• whooping cough

• plague

• leprosy

Ovulation takes place in a month between

• 11-14 day

• 14-16 day

• 15-28 days

• 21-26 day

Pneumatic bones are expected to be found in

• house lizard

• flying fish

• pigeon

• tadpole of frog

Balbiani rings are the structural features of

• allosomes

• polytene chromosomes

• autosomes

• Lampbrush chromosomes

Presence of tail in a child is an example of

• atavism

• divergent evolution

• convergent evolution

• mutation

Accessory sexual character in female is promoted by

• androgen

• progesterone

• estrogen

• testosterone

X- linked recessive gene is

• always expressed in male

• always expressed in femlae

• lethal

• sub- lethal

Mesozoic era is Golden period of

• reptiles

• Mollusca

• fishes

• amphibians

Repressor protein is produced by

• regulator gene

• operator gene

• structural gene

• promoter gene