A classic biochemical experiment nicely illustrated the point that the ribosome recognizes tRNA and not the amino acid that it is carrying. In that following observation were made. Which of them can be correct.

A. The cysteine attached to cysteine-tRNACys can be converted to an alanine by chemical reduction to give alanine-tRNACys.

B. Alanine-tRNACys introduces alanines at codons that specify insertion of cysteine.

C. Different mechanism is used to incorporate selenocyteine on tRNA as selenocysteine is incorporated into proteins by chemical modification after translation

D. Selenocysteine is generated enzymatically from serine carried on a special tRNA that is charged by serine-tRNA synthetase

E. Above examples can conclude that the translation machinery relies on the high fidelity of the aminoacyl-tRNA synthetases to ensure the accurate decoding of each mRNA

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#Question id: 28942

#Unit 7. System Physiology – Animal

Which of the following tripeptide hormones, stimulates the secretion of TSH by thyrotropes in anterior pituitary?

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#Question id: 28943

#Unit 7. System Physiology – Animal

Hypothalamus secreting Corticotropin-releasing hormone (CRH) stimulates the secretion of____

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#Question id: 28944

#Unit 7. System Physiology – Animal

Which of the following Prediction is correct about adrenocorticotropic hormone (ACTH) ? 

a) CRH Stimulates secretion of ACTH by corticotropes

b) it controls the secretion of cortisol by the activation of adenylyl cyclase via Gαq

c) it controls the secretion of cortisol by the activation of adenylyl cyclase via Gαs

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#Question id: 28945

#Unit 7. System Physiology – Animal

Which of the following hormones is involved to promotes the mammary gland development and milk production?

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#Question id: 28946

#Unit 7. System Physiology – Animal

GnRH is carried to the anterior pituitary, stimulates the secretion of hormones by gonadotropes. these hormones are; 

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#Question id: 28947

#Unit 7. System Physiology – Animal

Kallmann syndrome exhibit gonadal dysfunctions in male, which of the following statements is incorrect ?

A. a condition that causes hypogonadotropic hypogonadism (HH) 

B. an impaired sense of smell called anosmia 

C. it causes due to the deficiency of gonadotropin-releasing hormone (GnRH) 

D. they have higher level of circulating gonadotropins

E. a condition that causes hypergonadotropic hypergonadism (HH)