Biochemistry - Carbohydrates Part I - NEET Pattern

By Kar

Kar, Assistant Professor (Biochemistry)

Karthikeyan Pethusamy is an assistant professor in the Department of Biochemistry at the All India Institute of Medical Sciences in New Delhi

Quizzes Created: 34 | Total Attempts: 42,349

, Assistant Professor (Biochemistry)

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Questions: 7 | Attempts: 436 | Updated: Mar 21, 2023

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NEET pattern of questions
1. Single best answer
2. Multiple best answers
3. True or False
4. Assertion and reason type

Questions and Answers

1.

Inulin is a heteropolymer of
- A.
  
  Fructose & Glucose
- B.
  
  Glucose & Galactose
- C.
  
  Fructans & Glucans
- D.
  
  Inulin is not a hetero-polymer. It is mainly made up of fructose.
Correct Answer
D. Inulin is not a hetero-polymer. It is mainly made up of fructose.

Explanation
Inulin is a type of carbohydrate that is mainly composed of fructose molecules. It is not considered a heteropolymer because it is made up of a single type of monosaccharide, fructose, rather than a combination of different monosaccharides. Therefore, the correct answer is that inulin is not a hetero-polymer and is mainly made up of fructose.

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2.

MULTIPLE CORRECT OPTIONS PRESENT Atkin's diet is
- A.
  
  Low carbohydrate diet
- B.
  
  Ketogenic diet
- C.
  
  Low protein diet
- D.
  
  Fat restricted low calorie diet
Correct Answer(s)
A. Low carbohydrate diet
B. Ketogenic diet

Explanation
en.wikipedia.org/wiki/Atkins_diet

தமிழில் - http://ta.wikipedia.org/wiki/ஆட்கின்சு உணவு

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3.

MULTIPLE CORRECT OPTIONS PRESENTSelect the correct statements
- A.
  
  Human milk contains more lactose than cow's milk
- B.
  
  β-galactosidase is the other name of lactase
- C.
  
  Lactase is a brush border enzyme
- D.
  
  Lactose is made up of glucose and galactose linked by β-1→2 glycosidic linkage
Correct Answer(s)
A. Human milk contains more lactose than cow's milk
B. β-galactosidase is the other name of lactase
C. Lactase is a brush border enzyme

Explanation
Human milk is said to be the sweetest !

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4.

Insulin Inhibits Glycogen Phosphorylase
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Glycogen Phosphorylase increases the blood glucose level. Insulin decreases the blood glucose level. So insulin Inhibits Glycogen Phosphorylase

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5.

Assertion and reason type: Statement A - Carbohydrates can be converted to lipids Statement B - Lipids can be converted to carbohydrates
- A.
  
  Statement A correct & Statement B wrong. Statement B is not the reason for Statement A
- B.
  
  Statement A Wrong & Statement B correct. Statement B is not the reason for Statement A
- C.
  
  Both statements are wrong
- D.
  
  Both are correct and B is the reason for A
Correct Answer
A. Statement A correct & Statement B wrong. Statement B is not the reason for Statement A

Explanation
Carbohydrates can be converted to lipids through a process called lipogenesis, where excess glucose molecules are converted into fatty acids and then stored as triglycerides in adipose tissue. However, the conversion of lipids to carbohydrates is not a common physiological process in humans. While lipids can be broken down into fatty acids and used for energy, they are not typically converted back into glucose molecules. Therefore, Statement A is correct as it is supported by scientific evidence, while Statement B is incorrect as it does not provide a valid reason for Statement A.

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6.

β-D-glucopyranose & β-D-mannopyranose are epimers because they differ only in Fourth carbon
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
β-D-glucopyranose and β-D-mannopyranose are not epimers because they do not differ only in the fourth carbon. Epimers are stereoisomers that differ in the configuration of only one chiral carbon atom. In this case, glucopyranose and mannopyranose differ in the configuration of multiple carbon atoms, not just the fourth carbon.

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7.

Correct statement about sucrose
- A.
  
  Inert sugar
- B.
  
  Reducing sugar
- C.
  
  Made up of 13 carbons
- D.
  
  α-D-glucopyranosyl-(1→2)-β-D-fructofuranoside
Correct Answer
D. α-D-glucopyranosyl-(1→2)-β-D-fructofuranoside

Explanation
Sucrose is a disaccharide composed of glucose and fructose molecules. It is not a reducing sugar because it does not have a free aldehyde or ketone group that can participate in a reducing reaction. Sucrose is often referred to as an inert sugar because it does not undergo chemical reactions easily. The given answer provides the specific chemical structure of sucrose, indicating that it is composed of an α-D-glucopyranosyl unit linked to a β-D-fructofuranoside unit through a glycosidic bond.

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Kar |Assistant Professor (Biochemistry) |

Karthikeyan Pethusamy is an assistant professor in the Department of Biochemistry at the All India Institute of Medical Sciences in New Delhi

Biochemistry - Carbohydrates Part I - NEET Pattern

Inulin is a heteropolymer of

MULTIPLE CORRECT OPTIONS PRESENT Atkin's diet is

MULTIPLE CORRECT OPTIONS PRESENTSelect the correct statements

Insulin Inhibits Glycogen Phosphorylase

Assertion and reason type: Statement A - Carbohydrates can be converted to lipids Statement B - Lipids can be converted to carbohydrates

β-D-glucopyranose & β-D-mannopyranose are epimers because they differ only in Fourth carbon

Correct statement about sucrose