EASY
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According to the secondary structure of DNA the backbone of the polynucleotide chain is formed by the sugar-phosphate-protein chain.

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Important Questions on Biomolecules

EASY
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
The Fischer presentation of D-glucose is given below

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The correct structure(s) of β-L- glucopyranose is(are)
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
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
EASY
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Optical activity of DNA is due to its:
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Write the names of two nucleic acids.
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
A 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:
EASY
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
How many different proteins consisting of 100 amino acids can be formed from 20 different amino acids?
HARD
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Which one of the following techniques is used for the detection of proteins?
HARD
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Radioisotopes are frequently used in the study of cellular processes. A culture of Escherichia coli is grown at 37°C in a minimal medium containing radioactive phosphorous. At the end of 48 hours, the amount of radioactivity expected in equimolar quantities of the following macromolecules is
EASY
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Which one of the following statements is wrong?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Which of the following amino acids is NOT involved in gluconeogenesis?
EASY
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers

Identify the chemical components of nucleic acid

A) Cysteine
B) Heterocyclic compound
C) Tyrosine
D) Phosphoric acid
E) Ribulose
F) Monosaccharide

HARD
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
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?
EASY
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Which one of the following pairs of molecules never forms a hydrogen bond between them?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Phospholipids are formed by the esterification of:
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Which of the following is not polymeric?
HARD
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
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?
EASY
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
In a protein molecule various amino acids are linked together by:
EASY
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
The protein P, the oligosaccharide O, and the oligonucleotide N are composed of 100 amino acid residues, 100 hexose residues and 100 nucleotides, respectively. Which one of the following orders of molecular weights is correct?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Bond Linking Monomers in Polymers
Choose the correct statements:
A) DNA directly codes for the synthesis of proteins
B) DNA and RNA both can function as genetic material
C) DNA is storage of genetic material and RNA transfers genetic information
D) RNA is indirectly codes for the synthesis of protein