CBSE Questions for Class 12 Engineering Chemistry Biomolecules Quiz 1 - MCQExams.com

Amylopectin is composed of:
  • $$\alpha-D-$$glucose, $$C_1-C_4$$ and $$C_1-C_6$$ linkages
  • $$\alpha-D-$$glucose, $$C_1-C_4$$ and $$C_2-C_6$$ linkages
  • $$\beta-D-$$glucose, $$C_1-C_4$$ and $$C_2-C_6$$ linkages
  • $$\beta-D-$$glucose, $$C_1-C_4$$ and $$C_1-C_6$$ linkages
Transition state structure of the substrate formed during an enzymatic reation is
  • Temporary but stable.
  • Permanent but unstable.
  • Temporary and unstable.
  • Permanent and stable.
The major role of minor elements inside living organisms is to act as
  • Cofactors of enzymes.
  • Building blocks of important amino acids.
  • Constituent of hormones.
  • Binder of cell structure.
A non-proteinaceous enzyme is
  • Ligase
  • Deoxyribonuclease
  • Lysozyme
  • Ribozyme
Which of the following describes the given graph correctly?
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  • Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
  • Exothermic reaction with energy a is absence of enzyme and B in presence of enzyme.
  • Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
  • Endothermic reaction with energy A is presence of enzyme and B in absence of enzyme.
Sucrose on hydrolysis gives
  • $$\alpha$$-D-Glucose $$+\beta$$-D-Glucose
  • $$\alpha$$-D-Glucose $$+\beta$$-D-Fructose
  • $$\alpha$$-D-Fructose$$+\beta$$-D-Fructose
  • $$\beta$$-D-Glucose$$+\alpha$$-D-Fructose
Which one of the following statements is correct, with reference to enzymes?
  • Holoenzymes $$=$$ Coenzyme$$+$$ Co-factor
  • Apoenzyme $$=$$ Holoenzyme $$+$$ Coenzyme
  • Holoenzyme $$=$$ Apoenzyme $$+$$ Coenzyme
  • Coenzyme $$=$$ Apoenzyme $$+$$ Holoenzyme
Starch is a mixture of two components, a water soluble component amylose(15-20%) and a water insoluble component amylopectin (80-85%). The aqueous solution of amylose gives a blue colour with iodine solution due to the formation of:
  • amylose iodide
  • amylose iodate
  • inclusion complex
  • amylose tetraiodide complex
The metal present in vitamin $${B}_{12}$$ is:
  • magnesium
  • cobalt
  • copper
  • zinc
Ergocalciferol is name of vitamin:
  • $$A$$
  • $$B$$
  • $$C$$
  • $$D_2$$
The polysaccharide among the following is :
  • Glucose
  • Cellulose
  • Starch
  • Sucrose
Vitamin A is known as:
  • thiamine
  • pyridoxine
  • retinol
  • tocopherol
 Riboflavin vitamin is:
  • B$$_{1}$$
  • B$$_{2}$$
  • B$$_{12}$$
  • B$$_{6}$$
The source of pyridoxine is:
  • cereals
  • meat
  • yeast
  • all of the above
The best source of vitamin A is:
  • oranges
  • beans
  • carrots
  • wheat
The term hormone was first introduced by
  • Gobind khorana
  • Baylers and Starling
  • James waston
  • Giulio natta
Which of the following is correct about starch?
  • It is a white cyrstalline powder
  • Coloured amorphous powder
  • It is white-amorphous powder
  • Coloured crystalline compound
In plants, enzymes are present
  • Only in flowers
  • Only in leaves
  • In all the living cells of plant body
  • Only in parenchyma
The source of retinol (vitamin A) is:
  • liver
  • kidney
  • fish oils
  • all the above

Which of the following is not a coenzyme?
  • NAD
  • NADP
  • FAD
  • ATP
Enzymes are  polymers of
  • Hexose carbon
  • Fatty acids
  • Amino acids
  • Inorganic phosphate
Which of the following is not an attribute of enzymes?
  • They are proteinaceous in nature.
  • They speed up the rate of biochemical reactions.
  • They are specific in nature.
  • They are used up in reactions.
The enzymes act between the temperature range of
  • 35- 40 degrees
  • 30- 35 degrees
  • 40- 45 degrees
  • 50 degrees and above
Which of the following is a source of instant energy?
  • Salt
  • Glucose
  • Water
  • Starch
Glucose is carbohydrate.
  • True
  • False
Enzymes are different from inorganic catalysts in
  • Not being used up in reactions.
  • Being proteinaceous in nature.
  • Having high diffusion rate.
  • Working at high temperature.
An enzyme can be synthesised by chemically bonding together molecules of 
  • Carbohydrates
  • Amino acids
  • Lipases
  • CO$$_{2}$$
K$$_m$$ is related to
  • Morphology
  • ABO blood group
  • ES complex
  • Chromatography
What is a coenzyme?
  • Always protein
  • Often metal
  • Always inorganic compound
  • Often a vitamin
Glutamic acid has two carboxyl groups.
  • True
  • False
The products formed when a pinch of sugar is strongly heated for fifteen minutes in a test tube are:
  • carbon and water vapour
  • carbon, hydrogen and oxygen
  • carbon dioxide and water vapour
  • carbon dioxide and hydrogen
The chemical nature of enzymes is
  • Protein
  • Nucleic acid
  • Carbohydrate
  • Lipid
  • Steroid
What is the chemical nature of enzyme?
  • Protein
  • Nucleic acid
  • Carbohydrate
  • Lipid
  • Steroid
Which one is not a constituent of nucleic acid?
  • Uracil
  • Guanidine
  • Phosphoric acid
  • Ribose sugar
 The empirical formula for glucose is:
  • $$C_2H_4O_2$$
  • $$CH_2O$$
  • $$CHO$$
  • $$C_2HO_2$$
Agarose is a polymer of:
  • glucose
  • agarobiose
  • polyacrylamide
  • bisacrylamide
Enzymes are an example of which biological molecule?
  • Carbohydrates
  • Proteins
  • Lipids
  • Nucleic acids
  • Steroids
Number of known enzymes is
  • $$500$$
  • $$1000$$
  • $$1500$$
  • Over $$2000$$
A plant proteinase is
  • Papain
  • Trypsin
  • Pepsin
  • Urease
Repressible enzyme is
  • Present all the time
  • Functional almost all the time
  • Repressed in presence of a specific chemical
  • All the above
Iodine stains
  • Pectin
  • Lignified regions
  • Cellulose
  • Starch.
The enzyme purified and crystallised for the first time was
  • Urease
  • Insulin
  • Diastase
  • Zymase
An enzyme made of both protein and non-protein parts is together called
  • Coenzyme
  • Endoenzyme
  • Exoenzyme
  • Holoenzyme
The protein part of enzyme is
  • Prosthetic group
  • Apoenzyme
  • Holoenzyme
  • Zymogen
Which of the following vitamins is water soluble?
  • Vitamin E
  • Vitamin D
  • Riboflavin
  • Retinol
Which of the following statements is not correct?
  • Proteins are polyamides formed from amino acids
  • Except glycine, all other amino acids show optical activity
  • Natural proteins are commonly made up of L-isomer of amino acids
  • In $$\alpha-$$ amino acids, $$-{NH}_{2}$$ and $$-COOH$$ groups are attached to different carbon atoms
Starch is composed of two polysaccharides which are:
  • amylopectin and glycogen.
  • amylose and glycogen.
  • amylose and amylopectin.
  • cellulose and glycogen.
The light coming from the sun is stored as energy in plants by the process of photosynthesis. This happens by converting carbon dioxide and water into:
  • green leaves
  • carbohydrates
  • fats
  • plants hormones
When sugar is treated with sulphuric acid, we get a very pure form of:
  • carbon
  • oxygen
  • water
  • hydrogen
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
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