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. Proinsulin
C. Pro-opiomelanocortin (POMC)
D. Prorenin
Answer: Option C
Solution (By JKSSB Mock Tests)
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 statements about microorganisms: 1. Algae are photosynthetic. 2. Protozoa are multicellular. 3. Fungi reproduce by spores. Which are correct?
A. 1 and 3 only
B. 1 and 2 only
C. 1, 2 and 3
D. 2 and 3 only

Correct Answer: Option A


Explanation:
Algae are a diverse group of photosynthetic, eukaryotic organisms ranging from unicellular to multicellular forms. Protozoa are unicellular, heterotrophic eukaryotic organisms, not multicellular. Fungi typically reproduce asexually and sexually through the formation of spores, which are dispersed to form new individuals. Thus, statements 1 and 3 are correct.

This question belongs to: Science Biology
Question #2
The Cell Theory was proposed by:
A. Virchow and Brown
B. Hooke and Leeuwenhoek
C. Schleiden and Schwann
D. Watson and Crick

Correct Answer: Option C


Explanation:
The Cell Theory, one of the fundamental principles of biology, was proposed by Matthias Schleiden (a German botanist) in 1838 and Theodor Schwann (a British zoologist) in 1839. Schleiden concluded that all plants are composed of cells, and Schwann extended this to animals. Rudolf Virchow later added the third tenet in 1855: 'Omnis cellula e cellula' (all cells arise from pre-existing cells).

This question belongs to: Science Biology
Question #3
Identify the correct statement about the digestive enzymes:
A. Sucrase breaks down lactose.
B. Ptyalin is a lipase.
C. Pepsinogen is active without HCl.
D. Trypsin is secreted by the pancreas.

Correct Answer: Option D


Explanation:
Trypsin is a pancreatic protease. Ptyalin is an amylase, pepsinogen requires HCl for activation, sucrase acts on sucrose, lactase on lactose.

This question belongs to: Science Biology