71.

A nucleoside is

• base + sugar

• base + phosphate

• sugar+ phosphate

• base + sugar+ phosphate

Which is a typical example of 'feedback inhibition'?

• Allosteric inhibition of hexokinase by glucose-6-phosphate

• Reaction between succinic dehydrogenase and succinic acid

• Cyanide and cytochrome reaction

• Sulpha drugs and folic acid synthesizer bacteria

Identify the given structure

• Adenylic acid

• Uracil

• Cholesterol

• Adenosine

Which one of the following is an incorrect combination

• Adenine, thymine, cytidine

• Adenine, cytosine, thymine

• Guanine, thymine, uracil

• Cytosine, uracil, guanine

Assertion: Secondary metabolites are produced in small quantities and their extraction from the plant is difficult and expensive.

Reason: Secondary metabolites can be commercially produced by using tissue culture technique.

• 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.

Assertion : Carbohydrates are more suitable for the production of energy in the body than proteins and fats.

Reason : Carbohydrates can be stored in the tissues as glycogen and can be used for the production of energy, whenever necessary.

• 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

Which of the following are a group of micronutrients for plants

• Fe, Mn, Cu, Mo, Zn

• Fe, Mn, Cu, O, C

• Cu, B, Cl, Fe, Ca

• Ca, Mg, Fe

From the following groups, select the one which has only secondary metabolites?

• Arbrin, cellulose, arginine, tyrosine

• Glycine, gums, serine, diterpenes

• Carotenoids, phenylalanine, curcumin, rubber

• Conclavin-A, morphine, codeine, vinblastin

Which one of the following vitamins is antihaemorrhagic

• Vitamin B₁₂

• Vitamin C

• Vitamin B₅

• Vitamin K

Assertion: Deficiency symptoms of N, K and Mg are first visible in the senescent leaves.

Reason: Biomolecules containing these elements are broken down in the older leaves, making these elements available for mobilising to younger leaves.

• 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.