The 'Hormone Melanocyte-Stimulating Hormone' (MSH) in humans is primarily derived from the cleavage of a larger precursor protein called: MCQ with Answer and Explanation

The 'Hormone Melanocyte-Stimulating Hormone' (MSH) in humans is primarily derived from the cleavage of a larger precursor protein called:
A. Prothrombin
B. Prorenin
C. Proinsulin
D. Pro-opiomelanocortin (POMC)
Answer: Option D
Solution (By JKExamLibrary)
In humans, the intermediate lobe of the pituitary is rudimentary, and most Melanocyte-Stimulating Hormone (MSH) is produced in the anterior lobe (pars distalis). It is not synthesized as a separate hormone but is derived from the proteolytic cleavage of a large precursor polypeptide called pro-opiomelanocortin (POMC). POMC is cleaved to produce several biologically active peptides, including Adrenocorticotropic Hormone (ACTH), beta-lipotropin, beta-endorphin, and various forms of MSH (alpha, beta, gamma).

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Practice More Biology Questions

Question #1
Consider the following statements about DNA fingerprinting:
1. It uses VNTRs (variable number tandem repeats).
2. It can be used in paternity testing.
3. It requires amplification by PCR.
Which of the above is/are correct?
A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2, and 3

Correct Answer: Option D


Explanation:
DNA fingerprinting analyzes VNTRs, often amplified by PCR, and is used in forensics and paternity. All three are correct.

This question belongs to: Science Biology
Question #2
Mammary glands are a defining feature of which class of animals?
A. Aves
B. Mammalia
C. Reptilia
D. Amphibia

Correct Answer: Option B


Explanation:
Mammalia is the only class of animals that possess mammary glands, which produce milk to nourish their young ones. Other defining features of mammals include the presence of hair on the skin, external pinnae (ear flaps), a four-chambered heart, and being warm-blooded (homeothermic). Examples include humans, whales, and bats.

This question belongs to: Science Biology
Question #3
The number of ATP molecules produced from one glucose molecule during aerobic respiration is approximately:
A. 18
B. 2
C. 4
D. 36-38

Correct Answer: Option D


Explanation:
In eukaryotes, complete oxidation of one glucose molecule via glycolysis, Krebs cycle, and electron transport chain yields a net of about 36-38 ATP molecules (depending on shuttle systems). Glycolysis yields 2 ATP, Krebs 2 ATP, and oxidative phosphorylation 32-34 ATP. This is much higher than anaerobic respiration (2 ATP).

This question belongs to: Science Biology