The scientist who discovered the vaccine for rabies was: MCQ with Answer and Explanation

Question
The scientist who discovered the vaccine for rabies was:
A. Robert Koch
B. Edward Jenner
C. Louis Pasteur
D. Jonas Salk
Answer: Option C
Solution (By JKExamLibrary)
Louis Pasteur developed the first rabies vaccine in 1885, using dried spinal cords from infected rabbits. Jenner developed smallpox vaccine, Koch identified tuberculosis bacterium, Salk developed inactivated polio vaccine.
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Question #1
Which of the following statements about the human blood is correct?
A. A person with blood group AB can donate blood to all other groups.
B. Rh-negative individuals have the Rh antigen.
C. Plasma does not contain water.
D. O-negative blood is the universal donor for red cells.
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Correct Answer: Option D

Explanation:
O negative lacks A, B, and Rh antigens, so it can be given to anyone (RBCs). AB is universal recipient. Rh-negative lacks Rh antigen. Plasma is 90% water.
This question belongs to: Science Biology
Question #2
The fluid that lubricates joints and reduces friction is:
A. Cerebrospinal fluid
B. Aqueous humor
C. Synovial fluid
D. Pleural fluid
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Correct Answer: Option C

Explanation:
Synovial fluid is a viscous, egg-white-like fluid secreted by the synovial membrane in synovial joints (e.g., knee, hip). It lubricates articular cartilage, reducing friction and wear, and also nourishes cartilage. CSF cushions CNS, pleural fluid reduces lung friction, aqueous humor is in the eye.
This question belongs to: Science Biology
Question #3
The hormone that stimulates the Leydig cells to produce testosterone is:
A. GnRH
B. Inhibin
C. LH
D. FSH
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Correct Answer: Option C

Explanation:
Luteinizing hormone (LH) binds to Leydig cells in the testes, stimulating them to produce and secrete testosterone. FSH stimulates Sertoli cells for spermatogenesis. GnRH from hypothalamus stimulates release of LH and FSH.
This question belongs to: Science Biology
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