The enzyme that breaks down hydrogen peroxide into water and oxygen in cells is: MCQ with Answer and Explanation

The enzyme that breaks down hydrogen peroxide into water and oxygen in cells is:
A. Catalase
B. Lipase
C. Peroxidase
D. Amylase
Answer: Option A
Solution (By JKExamLibrary)
Catalase is found in peroxisomes and protects cells from oxidative damage by converting H₂O₂ (a toxic byproduct) into water and oxygen. Peroxidase also acts on peroxides but catalase is highly efficient. Amylase acts on starch, lipase on lipids. Liver and RBCs have high catalase activity.

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Practice More Biology Questions

Question #1
Which part of the human digestive tract is primarily responsible for the absorption of digested food?
A. Large intestine
B. Stomach
C. Small intestine
D. Esophagus

Correct Answer: Option C


Explanation:
The small intestine, especially the jejunum and ileum, is the major site for absorption of nutrients due to its large surface area from villi and microvilli. Stomach absorbs some water, alcohol, and drugs. Large intestine absorbs water and electrolytes. Esophagus is a conduit. The small intestine receives bile and pancreatic juice for digestion.

This question belongs to: Science Biology
Question #2
The structure that connects the kidney to the urinary bladder is the:
A. Nephron
B. Ureter
C. Urethra
D. Renal pelvis

Correct Answer: Option B


Explanation:
The ureter is a muscular tube that carries urine from the renal pelvis of each kidney to the urinary bladder by peristalsis. The urethra carries urine from the bladder to the exterior. Renal pelvis collects urine from calyces, nephron is the functional unit.

This question belongs to: Science Biology
Question #3
Which of the following is an example of a mutualistic relationship where a fungus and an alga live together?
A. Mycorrhiza
B. Rhizobium in root nodules
C. Cuscuta on a host plant
D. Lichen

Correct Answer: Option D


Explanation:
A lichen is a classic example of mutualism between a fungus (mycobiont) and an alga or cyanobacterium (phycobiont). The algal partner performs photosynthesis and provides organic food to the fungus. In return, the fungal partner provides a protective environment, absorbs water and minerals, and anchors the lichen to the substrate. Mycorrhiza is a mutualism between fungi and plant roots, and Rhizobium is a mutualism between bacteria and legume roots.

This question belongs to: Science Biology