Quiz on Vitamin

Vitamins are essential organic compounds required by the body in small quantities for normal growth, metabolism, and overall health. Unlike carbohydrates, proteins, or fats, vitamins do not provide energy but help the body use these nutrients effectively. They act as coenzymes, assisting in various biochemical reactions. Vitamins are divided into two categories — fat-soluble (A, D, E, and K) and water-soluble (B-complex and C). Fat-soluble vitamins are stored in the liver and fatty tissues, while water-soluble vitamins must be replenished regularly as they are excreted in urine. Deficiency or excess of vitamins can lead to various diseases — for example, lack of Vitamin D causes rickets, while deficiency of Vitamin C leads to scurvy. A balanced diet rich in fruits, vegetables, dairy, and whole grains ensures proper vitamin intake for a healthy body.

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MCQ Questions on Quiz on Vitamin

Q. What are enzymes?

A. Carbohydrates that store energy

B. Proteins that act as biological catalysts

C. Lipids that provide structure

D. Nucleic acids that carry information

Correct: Option (B)

Explanation: Enzymes are proteins that speed up biochemical reactions without being consumed in the process.

Q. Which of the following affects enzyme activity?

A. Temperature and pH

B. Color and odor

C. Pressure and density

D. Sound and light

Correct: Option (A)

Explanation: Both temperature and pH influence enzyme structure and activity by affecting the enzyme's active site.

Q. The specific region of an enzyme where the substrate binds is called the:

A. Active site

B. Binding zone

C. Catalytic chamber

D. Core site

Correct: Option (A)

Explanation: The active site is a specific region of the enzyme where the substrate binds and the reaction takes place.

Q. Which of the following statements about enzymes is TRUE?

A. They are consumed during reactions

B. They speed up reactions without being changed permanently

C. They work only at high temperatures

D. They can change the equilibrium of a reaction

Correct: Option (B)

Explanation: Enzymes act as catalysts, lowering activation energy without being used up.

Q. What happens to an enzyme when it is heated above its optimum temperature?

A. It becomes more active

B. It denatures and loses function

C. It dissolves in the substrate

D. It multiplies rapidly

Correct: Option (B)

Explanation: High temperature can break the hydrogen bonds maintaining the enzyme's structure, leading to denaturation.

Q. Which of the following enzymes breaks down starch into maltose?

A. Amylase

B. Lipase

C. Protease

D. Lactase

Correct: Option (A)

Explanation: Amylase catalyzes the breakdown of starch into maltose during digestion.

Q. Enzymes are generally composed of:

A. Proteins

B. Carbohydrates

C. Lipids

D. Minerals

Correct: Option (A)

Explanation: Most enzymes are proteins with complex 3D structures that determine their activity.

Q. Which enzyme is responsible for the breakdown of fats?

A. Lipase

B. Protease

C. Amylase

D. Catalase

Correct: Option (A)

Explanation: Lipase catalyzes the breakdown of lipids (fats) into fatty acids and glycerol.

Q. The enzyme that catalyzes the breakdown of hydrogen peroxide into water and oxygen is:

A. Catalase

B. Amylase

C. Urease

D. Pepsin

Correct: Option (A)

Explanation: Catalase breaks down hydrogen peroxide, a harmful byproduct of metabolism, into harmless water and oxygen.

Q. Which term refers to the loss of enzyme activity due to changes in shape?

A. Denaturation

B. Activation

C. Inhibition

D. Saturation

Correct: Option (A)

Explanation: Denaturation occurs when the enzyme loses its 3D structure due to heat, pH, or chemicals, rendering it inactive.

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