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NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12 PDF Download

Q.1. Given below are two statements:     (2023)
Statement I: A unit formed by the attachment of a base to 1' position of sugar is known as nucleoside.
Statement II: When nucleoside is linked to phosphorous acid at 5' -position of sugar moiety, we get nucleotide.
In the light of the above statements, choose the correct answer from the options given below:
A: Both Statement I and Statement II are true
B: Both Statement I and Statement II are false
C: Statement I is true but Statement II is false
D: Statement I is false but Statement II is true
Ans:
C
Solution: A unit formed by the attachment of a base to 1' position of sugar is known as nucleoside. In nucleosides, the sugar carbons are numbered as 1', 2', 3', etc. in order to distinguish these from the bases (Fig.(a)). When nucleoside is linked to phosphoric acid at 5' -position of sugar moiety, we get a nucleotide (Fig.(b)).  
NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12 

Q.2. The RBC deficiency is deficiency disease of:      (2021)
A: Vitamin B1
B: Vitamin B2
C: Vitamin B12
D: Vitamin B6
Ans: 
C
Solution: 
Vitamin B12 deficiency → Pernicious anaemia (RBC deficient in heamoglobin).

Q.3. Sucrose on hydrolysis gives:      (2020)
A: α-D-Glucose + β-D-Fructose
B: α-D-Fructose + β-D-Fructose

C: β-D-Glucose + α-D-Fructose
D: α-D-Glucose + β-D-Glucose

Ans: A
Solution:
NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12

Q.4. Which of the following is a basic amino acid?       (2020)
A: Tyrosine 
B: Lysine 
C: Serine
D: Alanine
Ans: B
Solution:
NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12
Basic part is more than acidic part so lysine is basic amino acid.

Q.5. The non-essential amino acid among the following is:    (2019)
A: Valine
B: Leucine
C: Alanine
D: Lysine
Ans: 
C

Q.6. The difference between amylose and amylopectin is    (2018)
A: Amylopectin have 1 → 4 α-linkage and 1→ 6α-linkage
B: Amylose have 1 → 4 α-linkage and 1→ 6β-linkage
C: Amylopectin have 1 → 4 α-linkage and 1→ 6β-linkage
D: Amylose is made up of glucose and galactose
Ans: A
Solution:

Amylose is long unbranched chain with α-D-Glucose with held by C1–C4 glucosidic linkage whereas amylopectin is branched chain polymer ofα-D glucose unit in which chain is formed by C1–C4 glycosidic linkage while branching occurs by C1–C6 glucosidic linkage.

Q.7. Which of the following compounds can form a zwitterion ?    (2018)
A: Aniline
B: Acetanilide
C: Benzoic acid
D: Glycine
Ans:
D
Solution:

The molecule which forms zwitter ion is glycine.
NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12

Q.8. Which of the following statements is not correct :-     (2017)
A: Ovalbumin is a simple food reserve in egg-white
B: Blood proteins thrombin and fibrinogen are involved in blood clotting
C: Denaturation makes the proteins more active
D: Insulin maintanis sugar level in the blood of a human body
Ans: 
C

Q.9. In a protein molecule various amino acids are linked together by:    (2016)
A: dative bond
B: α-glycosidic bond
C: β-glycosidic bond
D: peptide bond
Ans: 
D
Solution:

Two amino acids on the protein are linked by a peptide bond. For example. Glycyl-l-alanine is formed when carboxyl group of glycine combines with the amino group of alanine.
NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12
Two amino acids on the protein are linked by a peptide bond. For example. Glycyl-l-alanine is formed when carboxyl group of glycine combines with the amino group of alanine.
NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12

Q.10. Which one given below is a non-reducing sugar ?    (2016)
A: Sucrose
B: Maltose
C: Lactose
D: Glucose
Ans: 
A
Solution:

Sucrose is non-reducing sugar because it has one -CHO group.

Q.11. The correct statement regarding RNA and DNA, respectively is:     (2016)
A: The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose.
B: The sugar component in RNA is arabinose and the sugar component in DNA is 2'-deoxyribose.
C: The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.
D: The sugar component in RNA is arabinose and the sugar component in DNA is ribose.
Ans: C
Solution:

In DNA, two helically twisted strands connected together by steps. Each strand consists of alternating molecules of deoxyribose at 2'-position and phosphate groups.
On another hand, in RNA, the pentose sugar has an identical structure with deoxyribose sugar except that there is an -OH group instead of -H on carbon atom 2'. Hence it is only called ribose.

Q.12. Which of the following hormones is produced under the condition of stress which stimulates glycogenolysis in the liver of human beings ?    (2014)
A: Adrenaline
B: Estradiol
C: Thyroxin
D: Insulin
Ans: 
A

Q.13. D(+) glucose reacts with hydroxyl amine and yields an oxime. The structure of the oxime would be:    (2014)
A:

NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12
B:

NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12
C:

NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12
D:

NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12
Ans: 
B
Solution:

NEET Previous Year Questions (2014-2023): Biomolecules | Chemistry Class 12

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