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 491 Discuss
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The 'Cell Wall' of Diatoms is mainly composed of

A
Cellulose
B
Silica
C
Chitin
D
Pectin

Answer & Explanation

Correct Option: B

Diatoms have glass-like shells called frustules made of transparent silica.
Question 492 Discuss
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Identify the 'Hormone' responsible for the lowering of blood sugar

A
Adrenaline
B
Insulin
C
Glucagon
D
Thyroxine

Answer & Explanation

Correct Option: B

Insulin facilitates the uptake of glucose by body cells and its storage as glycogen in the liver.
Question 493 Discuss
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The 'Vasa Recta' is a system of capillaries associated with

A
Lungs
B
Nephrons
C
Heart
D
Brain

Answer & Explanation

Correct Option: B

Vasa recta are long capillaries that run parallel to the loop of Henle in juxtamedullary nephrons.
Question 494 Discuss
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Identify the 'Tricky' part: Which of the following is an 'Invertebrate' chordate

A
Shark
B
Hagfish
C
Amphioxus
D
Lamprey

Answer & Explanation

Correct Option: C

Amphioxus (Lancelet) belongs to Cephalochordata; it has a notochord but lacks a true vertebral column.
Question 495 Discuss
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Which of the following is the 'Structural' protein of hair and nails

A
Collagen
B
Keratin
C
Myosin
D
Fibrin

Answer & Explanation

Correct Option: B

Keratin is a tough, fibrous protein that provides structural support and waterproofing to the skin and its derivatives.
Question 496 Discuss
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Which of the following describes the 'Chloride Shift' (Hamburger phenomenon) during CO2 transport

A
Movement of Cl- from plasma into RBCs to maintain ionic balance
B
Movement of Cl- from RBCs into plasma to increase pH
C
Binding of Chlorine to hemoglobin to facilitate oxygen release
D
Active transport of Cl- into the alveoli for gaseous exchange

Answer & Explanation

Correct Option: A

To maintain electrical neutrality, Cl- ions move into RBCs when bicarbonate ions diffuse out into the plasma.
Question 497 Discuss
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In the human eye the 'Aqueous Humor' is secreted by which structure

A
Iris
B
Ciliary body
C
Cornea
D
Lacrimal gland

Answer & Explanation

Correct Option: B

The ciliary body produces aqueous humor, which maintains intraocular pressure and provides nutrients to the lens and cornea.
Question 498 Discuss
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Which of the following is a 'Stop Codon' that terminates the process of protein translation

A
AUG
B
UAA
C
GUG
D
UAC

Answer & Explanation

Correct Option: B

UAA, UAG, and UGA are the three stop codons that do not code for any amino acid.
Question 499 Discuss
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The 'T-wave' in a standard EKG (Electrocardiogram) represents

A
Atrial depolarization
B
Ventricular depolarization
C
Ventricular repolarization
D
Atrial repolarization

Answer & Explanation

Correct Option: C

The T-wave marks the recovery phase of the ventricles before the next heartbeat.
Question 500 Discuss
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Which of the following enzymes is used as a 'Marker Enzyme' for Lysosomes

A
Cytochrome oxidase
B
Acid phosphatase
C
DNA Polymerase
D
Succinate dehydrogenase

Answer & Explanation

Correct Option: B

Lysosomes are identified by their high content of hydrolytic enzymes that function best at acidic pH.
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