CBSE
Multiple Choice QuestionsYou are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of these will you not use for the purpose
Test tube containing calcium bicarbonate
Chilled test tube
Test tube containing heparin
Test tube containing sodium hydroxide
The figure given below shows three velocity substrate concentration curves for an enzyme reaction. What do the curves a, b, and c depict respectively
a-normal enzyme reaction,
b-competitive inhibition,
c-non-competitive inhibition.
a-enzyme with an allosteric modulator added,
b-normal enzyme activity,
c-competitive inhibition
a-enzyme with an allosteric stimulator,
b-competitive inhibition added
c-normal enzyme reaction
a-normal enzyme reaction,
b-non-competitive inhibitor added
c-allosteric inhibitor added
In an experiment freshly hatched larvae of an insect (Khapra beetle) were reared on a basal diet (complete diet without cholesterol) with increasing amounts of cholesterol. Results obtained are shown in the graph given in the table :
The graph indicates that
cholesterol is an essential dietary requirement of khapra beetle
growth of khapra beetle is directly proportional to cholesterol concentration
cholesterol concentration of 2 µg/g diet is the optimum level
growth of khapra beetle is inhibited when cholesterol concentration exceeds 5 g/g diet
Enzymes, vitamins and hormones can be classified into a single category of biological chemicals because of all of these
enhance oxidative metabolism
are conjugated proteins
are exclusively synthesised in the body of a living organism as at present
help in regulating metabolism.
Which one of the following statements regarding enzyme inhibition is correct?
Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein.
Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
Non-competitive inhibition ofan enzyme can be overcome by adding large amount of substrate
None of these
Which of the following contain -1, 4 linkage?
Maltose
Sucrose
Lactose
Fructose
Cattle fed with spoilt hay of sweet clover which contains dicumarol
are healthier due to a good diet
catch infections easily
may suffer vitamin K deficiency and prolonged bleeding
may suffer from beri-beri due to deficiency of vitamin B1
An example of competitive inhibition ofan enzyme is the inhibition of
succinic dehydrogenase by malonic acid
cytochrome oxidase by cyanide
hexokinase by glucose-6-phosphate
carbonic anhydrase by carbon dioxide
Which statement is true?
Adenine has 4 nitrogen atoms.
Cytosine has 3 nitrogen atoms
Guanosine has 3 nitrogen atoms
Uracil has 5 nitrogen atoms
Assertion: Competitive inhibitor is also called as substrate analogue.
Reason: It resembles the enzymes in structure.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
