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TLS Online TPP Program

#Question id: 7267

Endocrine disruptors can interfere with hormone function in many ways like, They can act as antagonists and inhibit the binding of a hormone to its receptor or block the synthesis of a hormone. which of the following example best explains the antagonistic effect of endocrine disruptors?

#Unit 5. Developmental Biology

  1. The endocrine disruptor diethylstilbestrol (DES), which binds to the estrogen receptor and mimics estradiol, a hormone that is very active in building the tissues of the female reproductive tract.

  2. DDE, a metabolic product of the insecticide DDT, can act as an anti-testosterone, binding to the androgen receptor and preventing normal testosterone from functioning properly.
  3. The herbicide atrazine, elevates the synthesis of estrogen and can convert testes into ovaries in frogs.
  4. Polychlorinated biphenyls (PCBs) disrupt the endocrine system is by interfering with the elimination and degradation of thyroid hormones.
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TLS Online TPP Program

#Question id: 15779

#Unit 5. Developmental Biology

During stem cell regulation extracellular mechanisms leading to intracellular changes that regulate stem cell behaviour. Which of the following is not consider as extracellular mechanisms for stem cell regulation?
TLS Online TPP Program

#Question id: 5057

#Unit 5. Developmental Biology

The major factor which is important in providing the competence for the ectoderm to respond to the inducers from the optic cup-
TLS Online TPP Program

#Question id: 3520

#Unit 8. Inheritance Biology

flower colour  in plant  RR- red , rr- white , Rr- pink  and height of plant ( TT,Tt-tall)  ,(tt- dwarf), If cross allowed between plant RrTt X Rrtt, then what probability of progeny plant having pink flower and dwarf variety ?
TLS Online TPP Program

#Question id: 7274

#Unit 5. Developmental Biology

The following experiment is designed to study the role of several hormones in the regulation of metamorphosis in frogs.

Group #

Treatment

Days to Metamorphosis

1

Saline

30

2

Prolactin

> 100

3

TSH

15

4

Thyroxine

10

5

Corticosterone

30

6

Thyroxine + Corticosterone

5

7

Prolactin + TSH

30

8

Thyroid gland removed

> 100

 If the thyroid gland were removed from the tadpoles in Group 3, metamorphosis would
TLS Online TPP Program

#Question id: 12992

#Unit 1. Molecules and their Interaction Relevant to Biology

α-helix changes its configurations according to the environment then
a. membrane encompassing α-helix have nonpolar residue oriented toward the membrane lipid.
b. if α-helix is found in plasm then polar residue will be oriented toward the outside.
c. if α-helix is found in plasm then nonpolar residue will be present inside the core.
d.  membrane encompassing α-helix have polar residue oriented towards the membrane lipid.
Choose incorrect statement