The enzyme that converts sucrose into glucose and fructose is: MCQ with Answer and Explanation

The enzyme that converts sucrose into glucose and fructose is:
A. Invertase
B. Maltase
C. Amylase
D. Lactase
Answer: Option A
Solution (By JKSSB Mock Tests)
Invertase (sucrase) hydrolyzes sucrose into its constituent monosaccharides, glucose and fructose. Maltase acts on maltose, lactase on lactose, amylase on starch. Invertase is found in the intestinal brush border and is also produced by yeast. The resulting mixture is called invert sugar, sweeter than sucrose.

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Practice More Biology Questions

Question #1
Which organelle is known as the 'suicide bag' of the cell?
A. Peroxisome
B. Golgi apparatus
C. Ribosome
D. Lysosome

Correct Answer: Option D


Explanation:
Lysosomes contain hydrolytic enzymes that can digest cellular components and even the whole cell if they burst, a process called autolysis. Hence, they are called suicide bags. They also perform autophagy and phagocytosis. Peroxisomes detoxify peroxides, Golgi modifies proteins, ribosomes synthesize proteins. Lysosomes are formed from the Golgi apparatus.

This question belongs to: Science Biology
Question #2
In plant physiology, the 'Imbibition' is a special type of diffusion where water is absorbed by solid particles (colloids), causing them to increase in volume. This process is crucial for:
A. The translocation of sugars in the phloem
B. The ascent of sap in tall trees
C. The opening and closing of stomata
D. The initial absorption of water by dry seeds, leading to germination

Correct Answer: Option D


Explanation:
Imbibition is a physical process where solid, hydrophilic (water-loving) colloidal materials (like cellulose, pectin, proteins, and starch) adsorb water, causing a tremendous increase in their volume and generating significant imbibitional pressure. This process is the very first step in seed germination. When a dry seed is exposed to water, its cell walls and storage materials imbibe water, causing the seed to swell, rupturing the seed coat, and initiating the metabolic activities required for the seedling to grow. It is also responsible for the splitting of rocks by plant roots.

This question belongs to: Science Biology
Question #3
The technique used to produce a large number of identical copies of a specific DNA fragment is:
A. Microarray
B. PCR
C. Gel electrophoresis
D. DNA sequencing

Correct Answer: Option B


Explanation:
Polymerase chain reaction (PCR) amplifies a specific DNA segment exponentially using primers, DNA polymerase (Taq), and thermal cycling. Gel electrophoresis separates DNA by size, sequencing determines base order, microarray analyzes gene expression. PCR is crucial in cloning, diagnostics, and forensics.

This question belongs to: Science Biology