CBSE
Multiple Choice QuestionsWhich of the following elements is present in very less quantity in the body
K
Ca
Mg
Cu
Which one of the following depresses brain activity and produces feelings of calmness, relaxation and drowsiness?
Morphine
Valium
Amphetamines
Hashish
Select the option having all correctly matched pairs.
A. Alkaloids (i) Carotenoid; Anthocyanin
B. Pigments (ii) Vinblastin; curcumin
C. Drugs (iii) Morphine; Codeine
A-i; B-ii;C-iii
A-ii; B-iii; C-i
A-iii; B-i; C-ii
A-i; B-iii; C-ii
Assertion : All proteinecous enzymes have a three-dimensional structure.
Reason : The secondary structure of protein is according to amino acid present inside the polypeptides.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are hue but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion : Glutamine contains amide group.
Reason : Isoelectric point of glutamine is 7.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are hue but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
In a normal adult, ascending order of concentration of following molecules is
K>Na>Fe>Cu
Na>K>Cu>Fe
Fe> Na> K > Cu
Na> Fe> K > Cu
What do A, B, C and D represent in the following figure?
A : carrier protein, B: symport, C: uniport, D : antiport
A : carrier protein, B : uniport, C: antiport, D : symport
A: carrier protein, B: antiport, C: symport, D : uniport
A : carrier protein, B: uniport, C: symport, D : antiport
Assertion: Enzymes lower down the activation energy of the reactant molecule to make its transition into product easier.
Reason: Enzymes are highly substrate specific catalysts.
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.
Vitamin B6 is also called
thiamine
pantothenic acid
pyridoxine
retinol
Assertion: Excess Mn in soil, can adversely decrease Mg, Fe and Cu concentrations in the soil.
Reason: Mn increases rate of photosynthesis, thereby increasing absorption of Mg, Fe and Ca from soil.
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
