Biomolecules practice · Hard

Glycerine used as a preservative for fruits, vegetables due to

The amino acid is directly used as the precursor in the formation of indole acetic acid.

A chemist isolated a protein from crab and wanted to determine its molecular weight. Which of the following method would have given the best result for him?

If one strand of DNA has the sequence ATCGTATG the sequence in the complementary strand would be:

Specific rotation for $\alpha$-anomer of a given mono saccharide is $100^{\circ}$ for $\beta$-anomer is $+20^{\circ}.$
Specific rotation of equilibrium mixture is $68^{\circ},$ if $\%$ of $\alpha$ anomer is $x \times 10 \%$ then ${x}$ is

Assertion: Complementary base pairing occurs in DNA.

Reason: This is because adenine is combined with cytosine with a double bond and guanine is combined with thymin with a triple bond.

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Amylose is insoluble in water.
Reason R : Amylose is a long linear molecule with more than 200 glucose units. In the light of the above statements, choose the correct answer from the options given below.

when sucrose is subjected to acetylated the molecular weight will be increased by how many units with respective molecular weight of sucrose

Select the uses of carbohydrates.

Which one of the following peak absorption range of ultraviolet light by heterocyclic bases (nitrogen bases)

Which of the following amino acid is metabolised by brain?

Nitrogenous bases present in DNA

An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point 6.0) glutamic acid (3.2) and arginine (10.7) buffered at pH6. What is the fate of the three acids?

Assertion (A): There is the coagulation of egg white on boiling.

Reason (R): Denaturation of protein is occur when its native form is subjected to physical change or chemical change.

Consider the following statements.

(i) Linkage between two monosaccharide units through oxygen atom is called glycosidic linkage.

(ii) Sucrose on hydrolysis gives an equimolar mixture of fructose and glucose which is dextrorotatory.

(iii) Lactose consists of linkage between $\mathrm{C}_1$ of galactose and $\mathrm{C}_4$ of glucose.

(iv) Out of two components of starch the component present in greater proportion is insoluble in water.

(v) Glycogen is also known as animal starch because it is structurally similar to amylose a component of starch.
Which of the following is the correct code for statements above?

Which of the following statements is correct?

Assertion (A): Amino acids react with acid and base both.

Reason (R): In Zwitter ionic form, amino acids show the amphoteric behaviour.

Mostly reactions with sugars are carried out in neutral or
acidic medium, If instead of neutral or acidic medium,
alkaline medium is used to carry out reaction then sugar
will undergoes with _______reaction.

Which of the following statements is/are true?

The function of glucose is to

Which one of the following statements is not correct?

An optically active compound $A$, gave an $\left[ \alpha \right]_\mathrm{D}^{25} = 30^\circ ,$ while a mixture of A and its enantiomer B, gave $\left[ \alpha \right]_\mathrm{D}^{25} = + 15^\circ .$ The ratio of $A$ and $B$ in the mixture is

Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide?

What does ' $D$ ' and $(+)$ signifies in $D-(+)$-glucose?

Identify the essential amino acids from below:

(A) Valine
(B) Proline

(C) Lysine
(D) Threonine

(E) Tyrosine

Choose the correct answer from the options given
below:

The most abundant molecule in cell is

The equilibrium constant of mutarotation of $\alpha-D$-glucose to $\beta-D$-glucose is 1.8. If specific rotation of $\alpha-D$-glucose is $112^{\circ}$ and that of mixture is $59^{\circ}.$ The specific rotation of $\beta-D$-glucose is

Animal starch is the other name of

Assertion: The bond between adenine and thymine is stronger than the bond between Cytosine and guanine.

Reason: Cytosine and guanine have a triple hydrogen bond while adenine and thymine have a double hydrogen bond.

Purines possess nitrogen at