Biochemistry-I MCQs | BIO202 MCQs | Set 5
Biochemistry-I MCQs | BIO202 MCQs | Set 5
MCQs (Multiple Choice Questions)
1) Sucrose is an example of
a) Polysaccharides
b) Monosaccharides
c) Disaccharides
d) Oligosaccharides
Correct Answer:
The correct answer is 'c'.
Explanation:
Sucrose is a disaccharide, composed of two simple sugar molecules, specifically glucose and fructose, joined together by a glycosidic bond.
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2) C12H22O11 is th formula of ________.
a) Maltose
b) Lactose
c) Sucrose
d) Glucose
Correct Answer:
The correct answer is 'c'.
Explanation:
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3) All of the following statements about glucose correct EXCEPT:
b) It mostly exists in L form
d) It is the precursor for all other carbohydrates in the body
Correct Answer:
The correct answer is 'b'.
Explanation:
This statement is incorrect. Glucose predominantly exists in the D form, not the L form. Glucose in the D form is commonly found in nature and is the biologically significant form in living organisms.
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4) Sugars are classified on the basis of number of atoms present. An example of a tetrose is:
a) glyceraldehyde
b) erythrose
c) glucose
d) ribose
Correct Answer:
The correct answer is 'a'.
Explanation:
Glyceraldehyde is classified as a tetrose because it is a sugar with four carbon atoms in its molecular structure. In organic chemistry, sugars are classified based on the number of carbon atoms they contain. Tetroses specifically contain four carbon atoms, and glyceraldehyde fits this classification as it has four carbons.
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5) Simplest carbohydrate is ________.
a) Glycerine
b) Glyceraldehyde
c) Glucose
d) Sucrose
Correct Answer:
The correct answer is 'b'.
Explanation:
Glyceraldehyde is the simplest carbohydrate among the options listed. It is a monosaccharide with three carbon atoms, making it the simplest sugar.
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6) Carbohydrates are detected in the laboratory based upon certain properties. Benedict's test is routinely used to check for the presence of ______________.
a) polysaccharides
b) ketohexoses
c) aldopentoses
d) reducing sugars
Correct Answer:
The correct answer is 'd'.
Explanation:
Benedict's test is routinely used to check for the presence of reducing sugars in a given sample. Reducing sugars are those that have a free aldehyde or ketone functional group, which can react with the Benedict's reagent and reduce it, resulting in a color change. This test is commonly used in the laboratory to detect the presence of sugars like glucose and fructose.
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7) Glucose and galactose are epimers which differ in the configuration around carbon no. ________.
a) 6
b) 1
c) 2
d) 4
Correct Answer:
The correct answer is 'd'.
Explanation:
Epimers are carbohydrates that differ in the configuration of one chiral carbon atom. Glucose and galactose are both hexoses, meaning they have six carbon atoms. The only difference between glucose and galactose is the configuration of the hydroxyl group on carbon atom number 4. In glucose, the hydroxyl group is on the right side of the molecule, while in galactose, the hydroxyl group is on the left side of the molecule.
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8) Glucose is excreted in urine in poorly controlled diabetes mellitus as a result of hyperglycemia. This medical condition is known as:
a) glyceraldehyde 3 dehydrogenase
b) glucosuria
c) hyper insulinism
d) hypoglycemia
Correct Answer:
The correct answer is 'b'.
Explanation:
Glucosuria is the medical condition where glucose is excreted in the urine due to poorly controlled diabetes mellitus and resulting hyperglycemia. It is sometimes referred to as glycosuria.
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9) _________ is commonly found in fruit juices, personal lubricants, and wine, and is used to create a tangy taste in food.
a) Glucose
b) Gloucono delta-lactone
c) Salt
d) Honey
Correct Answer:
The correct answer is 'b'.
Explanation:
Glucono delta-lactone (GDL) is commonly found in various food and non-food products, including fruit juices, personal lubricants, and wine. It is often used as an acidulant and sequestrant in the food industry and contributes to a tangy taste in food products.
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10) Carbohydrates are polyhydroxy ______, or substances that yield such compounds on hydrolysis.
a) All of given
b) Aldehydes or ketones
c) ketones
d) Aldehydes
Correct Answer:
The correct answer is 'b'.
Explanation:
Carbohydrates are polyhydroxy aldehydes or ketones, or substances that yield such compounds on hydrolysis. This definition encompasses various types of carbohydrates, including monosaccharides, which are simple sugars with either an aldehyde or ketone functional group.
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