The 'Spleen' in the human body is primarily located in the: MCQ with Answer and Explanation

Question
The 'Spleen' in the human body is primarily located in the:
A. Abdominal cavity, in the upper left quadrant
B. Thoracic cavity
C. Cranial cavity
D. Pelvic cavity
Answer: Option A
Solution (By JKSSB Mock Tests)
The spleen is the largest lymphoid organ in the body. It is located in the abdominal cavity, specifically in the upper left quadrant, tucked between the stomach and the diaphragm, protected by the rib cage (ribs 9-11). It functions primarily in filtering blood, removing old or damaged red blood cells, storing platelets, and mounting immune responses against blood-borne pathogens. It is not located in the thoracic, pelvic, or cranial cavities.
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Question #1
A plasmid used as a cloning vector must have:
A. An origin of replication and a selectable marker
B. A large size to hold more DNA
C. A single restriction site only
D. No antibiotic resistance genes
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Correct Answer: Option A

Explanation:
A plasmid used as a cloning vector in genetic engineering must have certain essential features: an Origin of Replication (ori) to ensure its replication within the host cell, a Selectable Marker (like an antibiotic resistance gene) to identify and eliminate non-transformants, and at least one unique Restriction Site (cloning site) for the insertion of the foreign DNA.
This question belongs to: Science Biology
Question #2
The Lac operon in E. coli is an example of an:
A. Constitutive operon
B. Repressible operon
C. Inducible operon
D. Attenuated operon
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Correct Answer: Option C

Explanation:
The Lac operon in E. coli is a classic example of an inducible operon. It is normally 'off' (repressed) because a repressor protein binds to the operator, preventing transcription. However, when the inducer (allolactose, derived from lactose) is present, it binds to the repressor, inactivating it and allowing RNA polymerase to transcribe the genes needed for lactose metabolism.
This question belongs to: Science Biology
Question #3
The hormone that causes the let-down of milk during breastfeeding is:
A. Estrogen
B. Progesterone
C. Prolactin
D. Oxytocin
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Correct Answer: Option D

Explanation:
Oxytocin from the posterior pituitary causes myoepithelial cells around mammary alveoli to contract, ejecting milk. Prolactin stimulates milk synthesis.
This question belongs to: Science Biology
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