Biomolecules

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New answer posted•a year ago

Biomolecules Class 12th

Three structures are given below in which two glucose units are linked. Which of these linkages between glucose units are between C1 and C4 and which linkages are between C1 and C6 ?

(a) (A) is between C₁ and C₄,(B) and (C) are between C₁ and C₆

(b) (A) and (B) are between C₁ and C₄, (C) is between C₁ and C₆

(c) (A) and (C) are between C₁ and C₄,( B) is between C₁ and C₆

(d) (A) and (C) are between C₁ and C₆,(B) is between C₁ and C₄

4 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

Correct option is C.

The links between C₁ and C₄ of glucose are shown as 'A' and ' C, ' respectively, whilst the linkage between C₁ and C₆ of the glucose units is shown as ' B. ' Furthermore, option (c) is clearly correct based o

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New answer posted•a year ago

Biomolecules Class 12th

Structure of a disaccharide formed by glucose and fructose is given below. Identify anomeric carbon atoms in monosaccharide units.

(a) ‘a’ carbon of glucose and ‘a’ carbon of fructose.

(b) ‘a’ carbon of glucose and ‘e’ carbon of fructose.

(c) ‘a’ carbon of glucose and ‘b’ carbon of fructose.
(d) ‘f’ carbon of glucose and ‘f ’ carbon of fructose.

6 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

The Correct option is c.

In the cyclic structure of glucose or fructose, anomeric carbon is carbon that is close to an oxygen atom. As shown in the structure above, atoms 'a' and 'b' are close to the oxygen atom, and the hydroxyl

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New answer posted•a year ago

Biomolecules Class 12th

Optical rotations of some compounds along with their structures are given below which of them have D-configuration.

(a) I, II, III

(b) II, III

(c) I, II

(d) III

7 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

The Correct option is a.

In the same way as (+) glyceraldehyde has a group on the lowest asymmetric carbon on the right side, the I, II, and III structures have a (-OH) group on the lowest asymmetric carbon on the right side givi

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New answer posted•a year ago

Biomolecules Class 12th

Which of the following reactions of glucose can be explained only by its cyclic structure?

(a) Glucose forms pentaacetate.

(b) Glucose reacts with hydroxylamine to form an oxime.

(c) Pentaacetate of glucose does not react with hydroxylamine.

(d) Glucose is oxidised by nitric acid to gluconic acid.

12 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

The Correct option is c.

The absence of a free (-CHO) aldehyde group is indicated by the fact that glucose pentaacetate does not react with hydroxylamine. The open structure of glucose cannot account for this, although the open c

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New answer posted•a year ago

Biomolecules Class 12th

Three cyclic structures of monosaccharides are given below which of these are anomers.

(a) I and II

(b) II and III

(c) I and III

(d) III is anomer of I and II

2 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

Ans: The Correct option is a.

Anomers are cyclic monosaccharide structures that differ structurally at carbon-1. In this scenario, I and II are anomers since they differ only at carbon -1.

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New answer posted•a year ago

Biomolecules Class 12th

Which of the following bases is not present in DNA?

(a) Adenine

(b) Thymine

(c) Cytosine

(d) Uracil

1 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

The Correct option is d.

Adenine, guanine, thymine, and cytosine are the four bases found in DNA. As a result, uracil is not found in DNA as we cannot identify it among the other nucleotides that are present in the DNA. Uracil is

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New answer posted•a year ago

Biomolecules Class 12th

Which of the following B group vitamins can be stored in our body?

(a) Vitamin B₁

(b) Vitamin B₂

(c) Vitamin B₆

(d) Vitamin B₁₂

1 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

The Correct option is d.

Water-soluble vitamins are those in the B group. B group vitamins cannot be stored in our systems since they are quickly excreted; but, because they are B₁₂ insoluble in water, our bodies may store the vi

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New answer posted•a year ago

Biomolecules Class 12th

DNA and RNA contain four bases each. Which of the following bases is not present in RNA?

(A) Adenine

(B) Uracil

(C) Thymine

(D) Cytosine

1 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

The Correct option is c.

The four bases contained in DNA are adenine, guanine, thymine, and cytosine. Adenine, uracil, guanine, and cytosine are the four bases of RNA. As a result, RNA does not include thymine as in place of thym

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New answer posted•a year ago

Biomolecules Class 12th

Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be ____________.

(a) Primary structure of proteins.

(b) Secondary structure of proteins.

(c) Tertiary structure of proteins.

(d) Quaternary structure of proteins.

1 Views|Posted a year ago

Asked by Alok Kumar Singh

Answered by

Alok Kumar Singh | Contributor-Level 10

a year ago

This is a Multiple Answer Type Questions as classified in NCERT Exemplar

The Correct option is a.

Proteins contain one or more polypeptide chains. When each polypeptide of a protein's amino acids is joined in a precise order, a proteins' main structure is referred to as its primary structure. This one

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New answer posted•a year ago

Biomolecules Class 12th