41.

The amnion of mammalian embryo is derived from

• ectoderm and mesoderm

• endoderm and mesoderm

• ectoderm and endoderm

• mesoderm and trophoblast

The contraceptive ‘SAHELI’

• blocks estrogen receptors in the uterus, preventing eggs from getting implanted.

• increases the concentration of estrogen and prevents ovulation in females.

• is a post-coital contraceptive.

• is an IUD.

Hormones secreted by the placenta to maintain pregnancy are

• hCG, hPL, progestogens, prolactin

• hCG, hPL, estrogens, relaxin, oxytocin

• hCG, progestogens, estrogens, glucocorticoids

• hCG, hPL, progestogens, estrogens

Match the items given in Column I with those in Column II and select the correct option given below :

• a	b	c
  iii	ii	i

• a	b	c
  i	iii	ii

• a	b	c
  iii	i	ii

• a	b	c
  ii	iii	i

All of the following are part of an operon except

• an operator

• structural genes

• a promoter

• an enhancer

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

• Only daughters

• Only sons

• Both sons and daughters

• Only grandchildren

According to Hugo de Vries, the mechanism of evolution is

• Multiple step mutations

• Saltation

• Minor mutations

• Phenotypic variations

AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?

• AGGUAUCGCAU

• UGGTUTCGCAT

• UCCAUAGCGUA

• ACCUAUGCGAU

Among the following sets of examples for divergent evolution, select the incorrect option :

• Forelimbs of man, bat and cheetah

• Heart of bat, man and cheetah

• Eye of octopus, bat and man

• Brain of bat, man and cheetah

Conversion of milk to curd improves its nutritional value by increasing the amount of

• Vitamin D

• Vitamin A

• Vitamin E

• Vitamin B₁₂