JEE Chemistry Biomolecules MCQs Set B

Question.  Globular proteins are present in
(a) milk
(b) blood
(c) eggs
(d) all of these

Answer: A

Question. In fibrous proteins, polypeptide chains are held together by
(a) hydrogen bonds
(b) covalent bonds
(c) electrostatic forces of attraction
(d) van der waals forces

Answer: A

Question. Which of the following is not a function of proteins?
(a) As energy provider for metabolism
(b) As food in the form of meat, eggs
(c) As a biological catalysts in the form of enzymes
(d) Formation of hair, wool, skin and nails

Answer: A

Question. Which of the following is not a fibrous protein?
(a) Insulin
(b) Keratin
(c) Myosin
(d) None of these

Answer: A

Question. A polypeptide with more than hundred amino acid residues, having molecular mass higher than 10,000 u is called
(a) protein
(b) enzyme
(c) hormone
(d) nucleic acid

Answer: A

Question. An insulin is a ______ which contains _____ amino acids.
(a) protein, 51
(b) hormone, 74
(c) protein, 74
(d) hormone, 51

Answer: A

Question. Which of the following is an example of globular proteins?
(a) Albumin
(b) Glycine
(c) Alanine
(d) None of these

Answer: A

Question. Which of the following is not a characteristics of fibrous proteins?
(a) These are generally soluble in water
(b) These have elongated shape.
(c) These have fibre like structure.
(d) In the fibrous proteins polypeptide chains are held together by hydrogen and disulphide bonds

Answer: A

Question. Which of the following statements is true about a peptide bond (RCONHR)?
(a) It is capable of forming a hydrogen bond
(b) It is non planar
(c) The cis configuration is favoured over the trans configuration.
(d) Single bond rotation is permitted between nitrogen and the carbonyl group

Answer: A

Question. The protein that transport oxygen in the blood stream is
(a) haemoglobin
(b) collagen
(c) insulin
(d) albumin

Answer: A

Question. The helical structure of protein is stabilized by
(a) hydrogen bonds
(b) peptide bonds
(c) dipeptide bonds
(d) ether bonds

Answer: A

Question. Which of the following indicates the order in which amino acids are linked together in a protein ?
(a) Primary structure
(b) Tertiary structure
(c) Secondary structure
(d) Quaternary structure

Answer: A

Question. Which of the following statement is not true about secondary structure of protein ?
(a) The hydrophilic/ hydrophobic character of amino acid residues is important to secondary structure
(b) The steric influence of amino acid residues is important to secondary structure
(c) The ability of peptide bonds to form intramolecular hydrogen bonds is important to secondary structure
(d) The alpha helix, beta pleated sheet and beta turns are examples of secondary structure of protein

Answer: A

Question. Which of the following terms indicates to the arrangement of different protein subunits in a multiprotein complex ?
(a) quaternary structure
(b) secondary structure
(c) primary structure
(d) tertiary structure

Answer: A

Question. Secondary structure of protein is mainly governed by
(a) hydrogen bonds
(b) covalent bonds
(c) disulphide bonds
(d) ionic bonds

Answer: A

Question. Tertiary structure of protein arises due to
(a) folding, coiling and bonding of polypeptide chain
(b) linear sequence of amino acid in polypeptide chain
(c) denatured proteins
(d) folding of polypeptide chain

Answer: A

Question.  Denaturation of proteins leads to loss of its biological activity by
(a) Loss of both secondary and tertiary structures
(b) Loss of both primary and secondary structures
(c) Loss of primary structure
(d) Formation of amino acids

Answer: A

Question. Coagulation of protein is known as
(a) denaturing
(b) decay
(c) deamination
(d) dehydration

Answer: A

Question. Which of the following terms refers to the overall three dimensional shape of a protein
(a) Tertiary structure
(b) Primary structure
(c) Secondary structure
(d) Quaternary structure

Answer: A

Question. Which of the following indicates to ‘regions of ordered structure within a protein
(a) Secondary structure
(b) Quaternary structure
(c) Primary structure
(d) Tertiary structure

Answer: A

Question. The strongest form of intermolecular bonding that could be formed involving the residue of the amino acid serine is.
(a) hydrogen bond
(b) ionic bond
(c) van der Waals interactions
(d) None of the above

Answer: A

Question. Which of the following protein destroy the antigen when it enters in body cell?
(a) Antibodies
(b) Chromoprotein
(c) Insulin
(d) Phosphoprotein

Answer: A

Question. Which of the following is incorrect regarding enzymes?
(a) They are very specific for a particular reaction but not for a particular substrate
(b) They are generally named after the compound or class of compounds upon which they work
(c) All the above statements are incorrect
(d) Most of them are globular proteins

Answer: A

Question. Enzymes take part in a reaction and
(a) increase the rate of a chemical reaction
(b) decrease the rate of a chemical reaction
(c) both
(d) None of these

Answer: A

Question. Enzymes are made up of
(a) Proteins with specific structure
(b) Edible proteins
(c) Nitrogen containing carbohydrates
(d) Carbohydrates

Answer: A

Question. The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called
(a) Lipase
(b) Pepsin
(c) Maltase
(d) Zymase

Answer: A

Question. Which one of the following, statements is incorrect about enzyme catalysis?
(a) Enzymes are least reactive at optimum temperature.
(b) Enzymes are denaturated by ultraviolet rays and at high temperature
(c) Enzyme action is specific
(d) Enzymes are mostly proteinous in nature

Answer: A

Question. Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?
(a) A hormone
(b) An antibiotic
(c) An enzyme
(d) A co-enzyme

Answer: A

Question. Enzymes are essential as biocatalysts. They function in
(a) aqueous medium, temp = 30–35ºC; pH=7
(b) organic medium
(c) aqueous medium under extreme pH conditions
(d) None of these

Answer: A

Question. Which of the following statements is incorrect?
(a) Enzymes always require a coenzyme in their catalytic  action.
(b) Enzymes action is specific
(c) Enzymes have a very large turnover number
(d) Enzymes are organic catalysts

Answer: A

Question. Among the following vitamins the one whose deficiency causes rickets (bone deficiency) is :
(a) Vitamin D
(b) Vitamin A
(c) Vitamin B
(d) Vitamin C

Answer: A

Question. Deficiency of vitamin B₁ causes the disease
(a) Beri-Beri
(b) Sterility
(c) Convulsions
(d) Cheilosis

Answer: A

Question. The vitamin that is not soluble in water is
(a) Vitamin D
(b) Vitamin B₁
(c) Vitamin B₂
(d) Vitamin B₆

Answer: A

Question. Anaemia is caused by the deficiency of vitamin
(a) B₁₂
(b) B₁
(c) B₆
(d) B₂

Answer: A

Question. Vegetable oils like wheat gram oil, sunflower oil etc. are the good source of
(a) vitamin E
(b) vitamin A
(c) vitamin K
(d) vitamin D

Answer: A

Question. Assertion : D(+)– Glucose is dextrorotatory in nature.
Reason : ‘D’ represents its dextrorotatory nature
(a) Assertion is correct, reason is incorrect
(b) Assertion is incorrect, reason is correct
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Assertion : Sucrose is called an invert sugar.
Reason : On hydrolysis, sucrose bring the change in the sign of rotation from dextro (+) to laevo(–).
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : At isoelectric point, the amino group does not migrate under the influence of electric field.
Reason : At isoelectric point, amino acid exists as a zwitterion.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Vitamin D cannot be stored in our body
Reason : Vitamin D is fat soluble vitamin and is excreted from the body in urine.
(a) Assertion is incorrect, reason is correct
(b) Assertion is correct, reason is incorrect
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Which one of the following is the reagent used to identify glucose?
(a) Ammoniacal silver nitrate
(b) Sodium ethoxide
(c) Chloroform and alcoholic KOH
(d) Neutral ferric chloride

Answer: A

Question. Glucose molecule reacts with 'X' number of molecules of phenylhydrazine to yield osazone. The value of 'X' is
(a) three
(b) one
(c) four
(d) two

Answer: A

Question. In the acetylation of glucose, which group is involved in the reaction
(a) alcoholic OH group
(b) CHO group
(c) >C = O group
(d) all of these

Answer: A

Question. Cyclic structure of fructose resembles with
(a) furan
(b) oxiran
(c) pyridine
(d) pyran

Answer: A

Question. Which one of the following statements is not true regarding (+) Lactose ?
(a) (+) Lactose is a reducing sugar and does not exhibit mutarotation
(b) (+) Lactose, C₁₂H₂₂O₁₁ contains 8-OH groups.
(c) On hydrolysis (+) Lactose gives equal amount of D(+) glucose and D(+) galactose
(d) None of these

Answer: A

Question. Which of the following statements is correct?
(a) Rhamnose having formula C₆H₁₂O₅ is a carbohydrate. Though this is not according to general formula of carbohydrates.
(b) Chemically the carbohydrates may be defined as optically inactive polyhydroxy aldehydes or ketones
(c) Only the compounds following general formula C_x(H₂O)y are carbohydrates
(d) None of these

Answer: A

Question. The strongest form of intermolecular bonding that could be formed involving the residue of the amino acid valine is
(a) van der Waals interactions
(b) none of the above
(c) ionic bond
(d) hydrogen bond

Answer: A