Questions and answers for exam Preparation

MCQs

Total Questions : 101 | Page 2 of 11 pages

Question 11. The binding of ligands to many GPCRs leads to ___________

Decrease in concentration of certain intracellular signal molecules called second messengers
Increase in concentration of certain intracellular signal molecules called second messengers
Decrease in concentration of certain extracellular signal molecules called first messengers
Increase in concentration of certain extracellular signal molecules called first messengers

Discuss Question

Answer: Option A. -> Decrease in concentration of certain intracellular signal molecules called second messengers
Answer: (a).Decrease in concentration of certain intracellular signal molecules called second messengers

Question 12. GPCR is comprised of ___________

7 transmembrane helices
8 transmembrane helices
9 transmembrane helices
10 transmembrane helices

Discuss Question

Answer: Option A. -> 7 transmembrane helices
Answer: (a).7 transmembrane helices

Question 13. Which second messenger signals the release of Ca⁺² from endoplasmic reticulum?

IP₃
1, 2 diacyl glycerol
cAMP
cGMP

Discuss Question

Answer: Option A. -> IP₃
Answer: (a).IP₃

Question 14. Which of the following serves as a neurotransmitter in adrenergic neurons?

Serotonin
Epinephrine
Dopamine
Histamine

Discuss Question

Answer: Option B. -> Epinephrine
Answer: (b).Epinephrine

Question 15. A hormone or ligand can be considered as ___________

First messenger
Second messenger
Third messenger
Fourth messenger

Discuss Question

Answer: Option A. -> First messenger
Answer: (a).First messenger

Question 16. Which of the following statements about Arabidopsis is not true?

In Arabidopsis, CTR-1 Ser/Thr protein kinase is activated by ethylene
Activation of MAPK cascade
EINI activation
Synthesis of ERF1 transcription factor

Discuss Question

Answer: Option A. -> In Arabidopsis, CTR-1 Ser/Thr protein kinase is activated by ethylene
Answer: (a).In Arabidopsis, CTR-1 Ser/Thr protein kinase is activated by ethylene

Question 17. The peptide trigger for the self-incompatibility response that prevents self-pollination is _________

Salicylic acid
Jasmonates
Brassinosteroids
Plant peptide hormones

Discuss Question

Answer: Option C. -> Brassinosteroids
Answer: (c).Brassinosteroids

Question 18. A factor involved in regulating the fate of stem cells in plant development is _________

Adrenaline
Epinephrine
Thyroid stimulating hormone
CLV1

Discuss Question

Answer: Option D. -> CLV1
Answer: (d).CLV1

Question 19. The 2-component system drives bacterial chemotaxis by coupling autophosphoryaltion of which receptor to phosphorylation of respective regulatory protein?