Biochemistry-I MCQs | BIO202 MCQs | Set 6 | Query Point Official
Biochemistry-I MCQs | BIO202 MCQs | Set 6
MCQs (Multiple Choice Questions)
1) If the carbonyl group is at the end of the carbon chain (that is, in an ________) the monosaccharide is an aldose.
a) ketone group
b) Aldehyde group
c) Carbonyl group
d) Carboxyl group
Correct Answer:
The correct answer is 'b'.
Explanation:
If the carbonyl group is at the end of the carbon chain in a monosaccharide, the monosaccharide is classified as an aldose. Aldoses have an aldehyde functional group at one end of the carbon chain.
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2) Dihydroxy acetone is example of a ________.
a) Tetrose
b) Triose
c) Hexose
d) Pentose
Correct Answer:
The correct answer is 'b'.
Explanation:
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3) Two sugars that differ only in the configuration around one carbon atom are called:
b) Trimers
c) Monomers
d) Dimers
Correct Answer:
The correct answer is 'a'.
Explanation:
Two sugars that differ only in the configuration around one carbon atom are called epimers. Epimers are a type of stereoisomer, and they have the same chemical formula but differ in the arrangement of atoms at one of their chiral carbon centers.
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4) Sugars molecule in DNA is a:
a) Triose sugar
b) Pentose sugar
c) Tetrose sugar
d) Hexose sugar
Correct Answer:
The correct answer is 'b'.
Explanation:
The sugar molecule found in DNA is a pentose sugar, specifically deoxyribose.
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5) In mammals, a protein starts with the following amino acid ________.
a) Methionin
b) Glycine
c) Lysine
d) Leucine
Correct Answer:
The correct answer is 'a'.
Explanation:
In mammals, many proteins start with the amino acid methionine. This is because methionine is often the first amino acid incorporated during protein synthesis, serving as the initiation codon (start codon) for translation.
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6) Which of the following is not a disaccharide?
a) Hyaluronic acid
b) Maltose
c) Lactose
d) Sucrose
Correct Answer:
The correct answer is 'a'.
Explanation:
Hyaluronic acid is not a disaccharide; it is a linear polysaccharide composed of repeating disaccharide units, consisting of N-acetylglucosamine and glucuronic acid. The other options (maltose, lactose, and sucrose) are indeed disaccharides.
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7) What is the molecular formula of Glucose?
a) C`H_3`OH
b) `C_12``H_22``O_11`
c) `C_6``H_12``O_6`
d) `C_6``H_12``O_5`
Correct Answer:
The correct answer is 'c'.
Explanation:
The molecular formula of glucose is `C_6``H_12``O_6`.
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8) Sucrose is composed of which two sugars?
a) Glucose and Glucose
b) Glucose and Fructose
c) Glucose and
Galactose
d) Fructose and Galactose
Correct Answer:
The correct answer is 'b'.
Explanation:
Sucrose is composed of two simple sugars, glucose and fructose, linked together by a glycosidic bond.
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9) In which of the following forms Glucose is stored in plants?
a) Starch
b) Dextrins
c) Glycogen
d) Cellulose
Correct Answer:
The correct answer is 'c'.
Explanation:
Glucose is stored in plants in the form of starch. Starch is a polysaccharide composed of glucose units and serves as a storage molecule for energy in plants.
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10) Which out of the following is a Carbohydrate with no nutritional value?
a) Glycogen
b) Starch
c) Dextrin
d) Cellulose
Correct Answer:
The correct answer is 'd'.
Explanation:
Cellulose is a carbohydrate that has no nutritional value for humans. While it is a polysaccharide like glycogen, starch, and dextrin, humans lack the enzymes necessary to digest cellulose, so it doesn't provide calories or nutrients when consumed. It is, however, an important component of dietary fiber.
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Frequently Asked Questions (FAQs)
What is an aldose sugar?
An aldose is a monosaccharide that has an aldehyde group at the end of its carbon chain.
What are epimers?
Epimers are stereoisomers that differ in configuration around just one carbon atom.
How is glucose stored in plants?
Plants store glucose primarily as starch, a polysaccharide used for energy storage.
Why is cellulose not a source of nutrition for humans?
Humans lack the enzymes to break down cellulose, so it provides no caloric energy but contributes to fiber intake.
What is the molecular formula of glucose?
Glucose has the chemical formula C₆H₁₂O₆, representing six carbons, twelve hydrogens, and six oxygens.
Related Topics
For more Introduction to BIOCHEMISTRY I topics, visit BIOLOGY Notes & MCQs.
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