The 'Hormone Prolactin' is secreted by the anterior pituitary gland. Its primary physiological role is to: MCQ with Answer and Explanation

The 'Hormone Prolactin' is secreted by the anterior pituitary gland. Its primary physiological role is to:
A. Stimulate the development of mammary glands and the production of milk (lactogenesis)
B. Trigger ovulation
C. Maintain the corpus luteum
D. Stimulate uterine contractions
Answer: Option A
Solution (By JKSSB Mock Tests)
Prolactin (PRL) is a peptide hormone secreted by the lactotroph cells of the anterior pituitary gland. Its primary and namesake function is to stimulate the development of the mammary glands during pregnancy and to initiate and maintain the production of milk (lactogenesis) after childbirth. While prolactin levels rise significantly during pregnancy, the high levels of estrogen and progesterone inhibit actual milk secretion until after delivery. Suckling by the infant is the primary stimulus for continued prolactin release.

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Practice More Biology Questions

Question #1
The scientific name of the common garden pea, extensively used by Mendel, is:
A. Pisum sativum
B. Cicer arietinum
C. Lathyrus sativus
D. Phaseolus vulgaris

Correct Answer: Option A


Explanation:
The common garden pea is scientifically named Pisum sativum. It belongs to the family Fabaceae. Mendel chose this plant for his genetic experiments because it has easily distinguishable contrasting traits, a short generation time, and is primarily self-pollinating. Cicer arietinum is chickpea, and Phaseolus vulgaris is the common bean.

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Question #2
Consider statements about genetics: 1. DNA replication is semi-conservative. 2. Transcription occurs in the cytoplasm. 3. Translation occurs at ribosomes. Which are correct?
A. 1, 2 and 3
B. 1 and 3 only
C. 2 and 3 only
D. 1 and 2 only

Correct Answer: Option B


Explanation:
DNA replication is semi-conservative, meaning each new DNA molecule contains one original parental strand and one newly synthesized strand. Transcription, the synthesis of mRNA from a DNA template, occurs in the nucleus of eukaryotes, not the cytoplasm. Translation, the synthesis of proteins from mRNA, occurs at ribosomes in the cytoplasm or on the rough ER. Thus, statements 1 and 3 are correct.

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Question #3
The deficiency of vitamin C causes:
A. Rickets
B. Scurvy
C. Beriberi
D. Night blindness

Correct Answer: Option B


Explanation:
Scurvy results from vitamin C deficiency, leading to bleeding gums, poor wound healing, and anemia. Vitamin A deficiency causes night blindness, D rickets, B₁ beriberi.

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