General
✓✗A phosphoglyceride is always made up of
- only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
- a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
- a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule
- only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
General
✓✗Which of the following is a primary metabolite?
- Curcumin
- Abrin
- Glucose
- Morphine
General
✓✗Which enzyme-bond pair is matched correctly?
- Amylase - peptide bond
- Nuclease - ester bond of fats
- Lipase - ester bond
- Protease - glycosidic bond
General
✓✗An enzyme-catalysed reaction converts glucose to pyruvic acid. In skeletal muscle under anaerobic conditions and in yeast, the end products are respectively
- glycogen and starch
- ethanol and lactic acid
- carbon dioxide and water
- lactic acid and ethanol
General
✓✗Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these
- enhance oxidative metabolism
- are conjugated proteins
- help in regulating metabolism
- are exclusively synthesised in the body of a living organism
General
✓✗For every 10 degrees C change in temperature in either direction, the rate of an uncatalysed reaction
- remains unchanged at all temperatures
- doubles or decreases by half
- increases tenfold for every degree
- falls to zero and stops completely
General
✓✗Identify the incorrect pair.
- Lectins - Concanavalin A
- Drugs - Ricin
- Toxin - Abrin
- Alkaloids - Codeine
General
✓✗Cellulose is a polymeric polysaccharide consisting of only one type of monosaccharide, namely
- galactose
- fructose
- ribose
- glucose
General
✓✗Collagen is listed in NCERT as a protein that forms the
- oxygen-carrying pigment
- sensory receptors
- digestive enzyme of the gut
- intercellular ground substance
General
✓✗An amino acid with a hydroxy methyl group as its R group is
- alanine
- glycine
- tyrosine
- serine
General
✓✗Metal ions act as cofactors by
- replacing the protein portion of the enzyme completely
- forming peptide bonds with the substrate molecule
- forming coordination bonds with side chains at the active site and with the substrate
- raising the temperature of the reaction mixture
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The structure of an amino acid changes in solutions of different pH.
Reason (R): The amino and carboxyl groups of amino acids are ionisable.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): The structure of an amino acid changes in solutions of different pH.
Reason (R): The amino and carboxyl groups of amino acids are ionisable.
In the light of the above statements, choose the correct answer from the options given below.
- (A) is true but (R) is false.
- (A) is false but (R) is true.
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true but (R) is not the correct explanation of (A).
General
✓✗Given below are two statements.
Statement I: In proteins, only right-handed helices are observed.
Statement II: The tertiary structure of a protein is absolutely necessary for many of its biological activities.
In the light of the above statements, choose the correct answer from the options given below.
Statement I: In proteins, only right-handed helices are observed.
Statement II: The tertiary structure of a protein is absolutely necessary for many of its biological activities.
In the light of the above statements, choose the correct answer from the options given below.
- Both Statement I and Statement II are correct.
- Both Statement I and Statement II are incorrect.
- Statement I is correct but Statement II is incorrect.
- Statement I is incorrect but Statement II is correct.
General
✓✗Enzymes catalysing hydrolysis of ester, ether, peptide or glycosidic bonds are
- isomerases
- hydrolases
- lyases
- ligases
General
✓✗Enzymes isolated from organisms that live in hot vents and sulphur springs are
- stable at high temperatures (up to 80-90 degrees C)
- active only at temperatures below 10 degrees C
- made of lipids instead of proteins and nucleic acids
- destroyed at temperatures just above 30 degrees C