Biomolecules Important Questions and Answers:
Ques. Molisch’s test is done for the detection of
(a) Alkyl halide
Ques. The bonds joining monoaccharide units in polysaccharides are called :
(a) Glycosidic bonds
(b) Nucleosidic bonds
(c) Glycogen bonds
(d) Peptide bonds
Ques. Insulin is
(a) An amino acid
(c) A carbohydrate
(d) A lipid
Ques. Which of the following is not present in thyroxine ?
(a) One COOH group
(b) An amino group
(c) Four iodine atoms
(d) Four chlorine atoms
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Ques. Which of the following monosaccharide is a pentose?
Ques. Which of the following complex compounds is found in red blood corpuscles whose main function is transportation of oxygen?
Ques. On complete hydrolysis of starch, we finally get
(c) Glucose and fructose
Ques. Which of the following disaccharides is formed from two identical monosaccharide units ?
Ques. Which is a reducing sugar?
(d) All of these
Ques. In glucose
(a) Five –OH groups are present
(b) Four secondary and one primay alcoholic groups are present
(c) One –CHO group is present
(d) All the these statements are correct
Ques. Galactose is converted into glucose in
Ques. Vitamin B1 is :
Ques. Vitamin B6 is known as
Ques. Which of the following bases is not present in RNA ?
Ques. The reason for double helical structure of DNA is operation of
(a) Vander Waal’s forces
(b) Dipole-dipole interaction
(c) Hydrogen bonding
(d) Electrostatic attractions
Ques. Which of the following is not an example of a pyrimidine base ?
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Ques. The double helical structure of DNA was proposed by
(a) Watson and Crick
(c) Emil Fischer
Ques. How many peptide bonds will be present in a tripeptide ?
Ques. Ascorbic acid is a
Ques. The name aminoacetic acid is given to which of the following compound ?
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Ques. A biological catalyst is essentially
(a) An enzyme
(b) A carbohydrate
(c) An amino acid
(d) A nitrogen compound
Ques. Which of the following compounds is formed as intermediate in the conversion of starch to glucose ?
Ques. Which amino acid has aromatic ring?
Ques. Which of the following sugars is generally found in the fruits ?
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Ques. Which of the following is a conjugated protein?
(d) All of these
Ques. Plant cell wall is made up of which of the following compounds ?
Ques. Read the following statements carefully
(a) Albumin is a simple protein
(b) The amino acid alanine contains an acidic side chain
(c) Insulin is a hormone
(d) Muscles contain the protein keratin
Ques. Glucose cannot be obtained by the hydrolysis of :
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Ques. Pepsin enzyme hydrolyses
(a) Proteins to amino acids
(b) Fats to fatty acids
(c) Glucose to ethyl alcohol
(d) Polysaccharides to monosaccharides
Ques. Cellulose is completely digested in which of the following organs of human body ?
(a) Large intestine
Ques. The waxes are long chain compounds of fatty acids, which belong to the class of
(d) Acetic acid
Ques. Which of the following acts as a biocatalyst ?
(b) Amino acid
(c) Nitrogen molecule
Ques. The most important food reserves of animals and plants are
Ques. Adenosine is the compound belonging to which of the following families ?
(b) Pyrimidine base
Ques. The safest and the most common alternative of sugar is
Ques. Which of the following bases is found in RNA and not in DNA ?
Ques. Which one of the following statements is true for protein synthesis (translation)?
(a) Amino acid are directly recognized by m-RNA
(b) The third base of the codon is less specific
(c) Only one codon codes for an amino acid
(d) Every t-RNA molecule has more than one amino acid attachment site
Ques. Which of the following factors is not a denaturant of enzymes ?
(b) Mechanical energy
(c) High salt concentration
(d) pH 7
Ques. Which of the following is not an amino acid?
Ques. Which of the following disaccharides is found in the milk?
Ques. Glucose gives many reactions of aldehyde, because
(a) It is hydrolysed to acetaldehyde
(b) It is a polyhydroxy ketone
(c) It is a cyclic aldehyde
(d) It is a hemiacetal in equilibrium with its aldehyde form in solution
Ques. Insulin belongs to which of the following families ?
Ques. Artificial silk is
Ques. Which of the following is invert sugar ?
(a) Mixture of glucose and galactose
(b) Mixture of glucose and fructose in equimolar ratio
(c) A type of cane sugar
(d) Optically inactive form of sugar
Ques. Which does not show mutarotation Sucrose?
Ques. Glucose and fructose are __ of each other
(b) functional group isomers
(c) mirror image isomers
Ques. Which of the following diseases is due to the deficiency of vitamin A ?
Ques. Which functional group participates in disulphide bond formation in proteins?
Ques. Glucose in blood can be quantitatively determined with
(a) Tollen’s reagent
(b) Benedict’s solution
(c) Alkaline iodine solution
(d) Bromine water
Ques. Which of the following is not present in a nucleotide?