General Science Jkssb Biology Set 1 Mcqs (605 MCQs) | JKSSB & SSC Quiz

General Science

jkssb biology set 1 mcqs

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Practice Questions

605 Total
Question 341 Discuss
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The 'Power House' of the cell is Mitochondria because it is the site of

A
Glycerol synthesis
B
ATP synthesis
C
Protein synthesis
D
Lipid synthesis

Answer & Explanation

Correct Option: B

Mitochondria produce ATP (energy currency) through the process of oxidative phosphorylation.
Question 342 Discuss
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Which of the following describes the 'Haldane Effect' in respiratory physiology

A
High oxygen concentration promotes the dissociation of carbon dioxide from hemoglobin
B
High carbon dioxide concentration promotes the dissociation of oxygen from hemoglobin
C
Low pH increases the affinity of hemoglobin for oxygen
D
Increased temperature shifts the oxygen-dissociation curve to the left

Answer & Explanation

Correct Option: A

The Haldane effect states that oxygenation of blood in the lungs displaces carbon dioxide from hemoglobin.
Question 343 Discuss
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In a plant cell the concentration of minerals in the vacuole is higher than in the cytoplasm because of

A
Passive diffusion through the tonoplast
B
Active transport against the concentration gradient
C
Osmosis of water into the vacuole
D
Facilitated diffusion through carrier proteins

Answer & Explanation

Correct Option: B

The tonoplast membrane uses energy (ATP) to pump ions into the vacuole against their concentration gradient.
Question 344 Discuss
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Which of the following nitrogenous bases is found in RNA but not in DNA

A
Adenine
B
Guanine
C
Cytosine
D
Uracil

Answer & Explanation

Correct Option: D

RNA contains Uracil, whereas DNA contains Thymine as its fourth nitrogenous base.
Question 345 Discuss
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Which specific part of the human kidney is responsible for the 'Counter-Current Mechanism' to concentrate urine

A
Proximal Convoluted Tubule
B
Loop of Henle and Vasa Recta
C
Bowmans Capsule
D
Distal Convoluted Tubule

Answer & Explanation

Correct Option: B

The proximity and opposite flow of the Loop of Henle and Vasa Recta create an osmotic gradient in the medulla.
Question 346 Discuss
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Which of the following enzymes is used as a 'Biological Scissor' in genetic engineering

A
DNA Ligase
B
DNA Polymerase
C
Restriction Endonuclease
D
Reverse Transcriptase

Answer & Explanation

Correct Option: C

Restriction enzymes cut DNA at specific nucleotide sequences, allowing for precise genetic manipulation.
Question 347 Discuss
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The 'Dark Reaction' or Calvin Cycle of photosynthesis takes place in which part of the chloroplast

A
Grana
B
Stroma
C
Thylakoid lumen
D
Inner membrane

Answer & Explanation

Correct Option: B

While light reactions occur in the grana, the enzymatic dark reactions occur in the fluid stroma.
Question 348 Discuss
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Which part of the digestive system contains 'Peyers Patches' that provide immunity against intestinal pathogens

A
Stomach
B
Ileum
C
Duodenum
D
Oesophagus

Answer & Explanation

Correct Option: B

Peyer's patches are lymphoid tissue clusters primarily found in the ileum of the small intestine.
Question 349 Discuss
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Which of the following is the 'Structural and functional unit' of the human liver

A
Nephron
B
Hepatocyte
C
Hepatic Lobule
D
Alveoli

Answer & Explanation

Correct Option: C

The hepatic lobule is a hexagonal structure consisting of plates of hepatocytes radiating from a central vein.
Question 350 Discuss
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In the human heart the 'Tricuspid Valve' is located between

A
Left atrium and Left ventricle
B
Right atrium and Right ventricle
C
Left ventricle and Aorta
D
Right ventricle and Pulmonary artery

Answer & Explanation

Correct Option: B

The tricuspid valve prevents backflow of blood from the right ventricle into the right atrium.
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