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Which among the following secondary metabolites is a lectin?

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Important Questions on Biomolecules

MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
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>Primary and Secondary Metabolites
In a protein molecule various amino acids are linked together by:
EASY
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
How many different proteins consisting of 100 amino acids can be formed from 20 different amino acids?
EASY
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Optical activity of DNA is due to its:
EASY
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their
EASY
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Which one of the following pairs of molecules never forms a hydrogen bond between them?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
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>Primary and Secondary Metabolites
Phospholipids are formed by the esterification of:
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Concanavalin A is:
EASY
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Which one of the following molecules is a secondary metabolite?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
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>Primary and Secondary Metabolites

Study the given statements and select the correct option?
(i) Carbohydrates, proteins, nucleic acids and lipids are primary metabolites
(ii) Alkaloids, flavonoids, rubber etc; are secondary metabolites
(iii) Linoleic, linolenic and palmitic acids are the three essential fatty acids

MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Which of the following amino acids is NOT involved in gluconeogenesis?
EASY
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?
HARD
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
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
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
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
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Which one of the following techniques is used for the detection of proteins?
EASY
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Which one of the following statements is wrong?
EASY
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Which ONE of the following molecules is derived from pantothenic acid?
MEDIUM
Biology>Cell : Structure and Functions>Biomolecules>Primary and Secondary Metabolites
Identify the incorrect pair.