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Optical activity of DNA is due to its:

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Important Questions on Biomolecules

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Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
Which one of the following statements is wrong?
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Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
In the polynucleotide chain of DNA, a nitrogenous base is linked to the -OH of:
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
5- Methyl Uracil means:
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Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
How many different proteins consisting of 100 amino acids can be formed from 20 different amino acids?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
Write the names of two nucleic acids.
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Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
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>Nucleic Acids
N-Glycosidic linkage contains:
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
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:
HARD
Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
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>Nucleic Acids
Which of the following biomolecules does have a phosphodiester bond?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
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>Nucleic Acids

Identify the chemical components of nucleic acid

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

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Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?
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Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
In a protein molecule various amino acids are linked together by:
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Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
Which one of the following pairs of molecules never forms a hydrogen bond between them?
HARD
Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
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?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
Which of the following amino acids is NOT involved in gluconeogenesis?
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Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
According to Watson-Crick model, hydrogen bonding in a double-stranded DNA occurs between
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Biology>Cell : Structure and Functions>Biomolecules>Nucleic Acids
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>Nucleic Acids
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