Biochemistry-I MCQs | BIO202 MCQs | Set 8 | Query Point Official
Biochemistry-I MCQs | BIO202 MCQs | Set 8
MCQs (Multiple Choice Questions)
1) Mannonic acid is a:
a) Sugar acid
b) Deoxy sugar
c) Amino sugar
d) sugar alcohol
Correct Answer:
The correct answer is 'a'.
Explanation:
Mannonic acid is a sugar acid, specifically a derivative of mannose, which is a monosaccharide. Sugar acids are sugars that have been oxidized to form carboxylic acid functional groups.
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2) Which of the following is not a monosaccharide with 5 carbon atoms?
a) Arabinose
b) Trehalose
c) Xylulose
d) Ribulose
Correct Answer:
The correct answer is 'b'.
Explanation:
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3) Which of the following gives a brown color on reaction with iodine?
b) Glycogen
c) Dextrin
d) Cellulose
Correct Answer:
The correct answer is 'b'.
Explanation:
Glycogen does indeed react with iodine to produce a reddish-brown color, which is used as a test for the presence of glycogen. Starch, on the other hand, reacts with iodine to produce a blue-black color, and dextrin may give a reddish-brown color, depending on its degree of branching and polymerization. Cellulose does not significantly react with iodine and does not produce a color change.
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4) 19-Invert sugar is:
a) Starch
b) Fructose
c) Glucose
d) Hydrolytic product of Sucrose
Correct Answer:
The correct answer is 'd'.
Explanation:
Invert sugar is the hydrolytic product of sucrose. It is formed when sucrose, a disaccharide made up of glucose and fructose, is broken down into its constituent monosaccharides, glucose, and fructose. This hydrolysis is typically achieved by the action of the enzyme invertase or by heating sucrose in an acidic solution.
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5) Which out of the following is a structural homopolysaccharide?
a) Hyaluronic acid
b) Chitin
c) Inulin
d) Starch
Correct Answer:
The correct answer is 'b'.
Explanation:
Chitin is a structural homopolysaccharide. It is composed of repeating units of N-acetylglucosamine and is commonly found in the exoskeletons of arthropods, the cell walls of fungi, and some other organisms. Chitin provides structural support and protection. Hyaluronic acid, inulin, and starch are not homopolysaccharides and have different structures and functions.
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6) What is the solubility of lipids in water?
a) Soluble
b) Partially soluble
c) Partially insoluble
d) Insoluble
Correct Answer:
The correct answer is 'd'.
Explanation:
Lipids are generally insoluble in water. They are hydrophobic molecules, meaning they do not mix well with water due to their nonpolar nature. Instead, lipids tend to form aggregates or separate from water.
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7) In the lungs, the pH of the blood is _______ because `CO_2` is being exhaled.
a) Neutral
b) Higher
c) Lower
d) Zero
Correct Answer:
The correct answer is 'b'.
Explanation:
In the lungs, the pH of the blood is higher because carbon dioxide (CO2) is being exhaled. When CO2 is removed from the bloodstream through respiration, the concentration of carbonic acid (H2CO3) decreases, leading to an increase in blood pH, making it more alkaline or basic.
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8) Identify the amino acids containing nonpolar, aliphatic R groups:
a) Phenylalanine, tyrosine and tryptophan
b) Glycine, alanine, leucine
c) Lysine, arginine,
histidine
d) Serine, threonine, cysteine
Correct Answer:
The correct answer is 'b'.
Explanation:
Amino acids with nonpolar, aliphatic R groups include glycine, alanine, and leucine. These R groups are hydrophobic and nonpolar, making them aliphatic. The amino acids listed in the other options have R groups with different properties (e.g., aromatic, polar, or charged).
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9) The name of Unsaturated acids with double bonds end in ______.
a) enoic
b) anoic
c) dnoic
d) none of the above
Correct Answer:
The correct answer is 'a'.
Explanation:
Unsaturated acids with double bonds end in "enoic." For example, oleic acid is an unsaturated fatty acid with a double bond and is an example of an enoic acid.
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10) The process by which oxygen enters the blood from the alveoli is
a) facilitated diffusion
b) diffusion
c) active transport
d) none
Correct Answer:
The correct answer is 'b'.
Explanation:
The process by which oxygen enters the blood from the alveoli is primarily through simple diffusion. Oxygen molecules move from an area of higher concentration (in the alveoli) to an area of lower concentration (in the blood) to reach equilibrium. This is a passive process and does not require active transport.
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Frequently Asked Questions (FAQs)
What is a sugar acid?
A sugar acid is formed when the aldehyde or terminal hydroxyl group of a sugar is oxidized to a carboxylic acid, such as mannonic acid.
How can you test for glycogen?
Glycogen reacts with iodine to produce a reddish‑brown color, distinguishing it from starch.
What does “invert sugar” mean?
Invert sugar refers to the product of sucrose hydrolysis, yielding glucose and fructose.
Why are lipids insoluble in water?
Lipids are hydrophobic due to nonpolar structures and do not mix with water.
How does oxygen enter blood from the lungs?
Oxygen enters the bloodstream from the alveoli by simple diffusion, moving from higher to lower concentration.
Related Topics
For more Introduction to BIOCHEMISTRY I topics, visit BIOLOGY Notes & MCQs.
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