HARD
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Select the incorrect matching of percentage component in living cell.

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Important Questions on Chemical Constituents of Living Cells

EASY
How many different proteins consisting of 100 amino acids can be formed from 20 different amino acids?
MEDIUM
The Fischer presentation of D-glucose is given below

Question Image

The correct structure(s) of β-L- glucopyranose is(are)
EASY
Which one of the following pairs of molecules never forms a hydrogen bond between them?
EASY
Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?
EASY
In a protein molecule various amino acids are linked together by:
MEDIUM
Phospholipids are formed by the esterification of:
EASY
Which one of the following is NOT an unsaturated fatty acid?
MEDIUM
25000 Da protein contains a single binding site for a molecule (ligand), whose molecular weight is 2500 Da. Assuming high affinity and physiologically irreversible binding the amount of the ligand required to occupy all the binding sites in 10 mg protein will be:
MEDIUM

Match List - I with List- II.

Column-I Column-II
(a) Protein (i) C=C double bonds
(b) Unsaturated fatty acid (ii) Phosphodiester bonds
(c) Nucleic acid (iii) Glycosidic bonds
(d) Polysaccharide (iv) Peptide bonds
Choose the correct answer from options given below.
MEDIUM
Which of the following amino acids is NOT involved in gluconeogenesis?
MEDIUM
Choose the CORRECT combination of statements given below related to cysteine residue in proteins.

i. Cysteine can be linked to tyrosine by S-O bond.

ii. Cysteine can be linked to another cysteine by S-S bond.

iii. Cysteine can complex with Zn2+.

iv. Cysteine can be linked to methionine by S-S bond
HARD
The activity of a certain protein is dependent on its phosphorylation. A mutation in its gene changed a single amino acid which affected the function of the molecule. Which amino acid change is most likely to account for this observation?
HARD
Two tubes labelled 'P' and 'Q' contain foodstuff. Tube 'P' gave a positive test with Benedict's solution while tube 'Q' gave a positive test with nitric acid. Which of the following is correct?
HARD
Which one of the following techniques is used for the detection of proteins?
MEDIUM

Read the following statements on lipids and find out the correct set of statements:

(a) Lecithin found in the plasma membrane is a glycolipid.

(b) Saturated fatty acids possess one or more C=C bonds.

(c) Gingelly oil has a lower melting point, and hence remains as oil in winter.

(d) Lipids are generally insoluble in water but soluble in some organic solvents.

(e) When a fatty acid is esterified with gIycerol, monoglycerides are formed.

Choose the correct answer from the options given below:

MEDIUM
Match List-I with List-II
List-I
(Biological Molecules)
List-II
(Biological functions)
(a) Glycogen (i) Hormone
(b) Globulin (ii) Biocatalyst
(c) Steroids (iii) Antibody
(d) Thrombin (iv) Storage product

Choose the correct answer from the options given below: