The movement of molecules against the concentration gradient with the use of ATP is: MCQ with Answer and Explanation

The movement of molecules against the concentration gradient with the use of ATP is:
A. Osmosis
B. Active transport
C. Facilitated diffusion
D. Diffusion
Answer: Option B
Solution (By JKSSB Mock Tests)
Active transport uses energy (usually ATP) to pump molecules or ions across a membrane against their electrochemical gradient, e.g., Na⁺/K⁺ pump. Diffusion, osmosis, and facilitated diffusion are passive processes that move substances down their gradient without energy expenditure.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1
The process of converting food into energy in cells is:
A. Transpiration
B. Photosynthesis
C. Fermentation
D. Cellular respiration

Correct Answer: Option D


Explanation:
Cellular respiration breaks down glucose and other nutrients in the presence of oxygen to produce ATP. Photosynthesis builds glucose, fermentation is anaerobic energy production, transpiration is water loss.

This question belongs to: Science Biology
Question #2
The scientist who discovered the sex chromosomes was:
A. Thomas Hunt Morgan
B. Walter Sutton
C. Gregor Mendel
D. Nettie Stevens

Correct Answer: Option D


Explanation:
Nettie Stevens (1905) discovered that sex is determined by the XY chromosomes in beetles. Morgan later confirmed chromosomal theory. Mendel discovered laws of inheritance.

This question belongs to: Science Biology
Question #3
The component of the bacterial cell wall that is targeted by lysozyme is:
A. Cellulose
B. Lipopolysaccharide
C. Chitin
D. Peptidoglycan

Correct Answer: Option D


Explanation:
Lysozyme, an enzyme found in tears, saliva, and egg white, hydrolyzes the β-1,4-glycosidic bond between N-acetylmuramic acid and N-acetylglucosamine in peptidoglycan, weakening the bacterial cell wall and causing lysis. It is part of innate immunity. Penicillin inhibits peptidoglycan synthesis.

This question belongs to: Science Biology