Biomolecules

Which of these are considered most essential in the origin of life?

• Enzymes

• Nucleic acids

• Carbohydrates

• Proteins

Assertion : Histamine is involved in allergic and inflammatory reactions.

Reason : Histamine is a vasodilator.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Which of the following would not give Fehling's test ?

• Glucose

• Sucrose

• Fructose

• Lactose

A nucleoside is

• base + sugar

• base + phosphate

• sugar+ phosphate

• base + sugar+ phosphate

Kuhne:

• discovered parathyroid

• coined the term enzyme

• coined the term gene

• discovered enzyme

Assertion : Wounds heal slowly due to vitamin C deficiency.

Reason : Vitamin C is essential for collagen formation

• If both Assertion and Reason are true and Reason is the correct explantion of Assertion

• If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If Assertion is false but Reason is true.

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

An example of competitive inhibition of an enzyme is the inhibition of:

• succinic dehydrogenase by malonic acid

• cytochrome oxidase by cyanide

• hexokinase by glucose-6-phosphate

• carbonic anhydrase by carbon dioxide

The vitamin nicotinamicle can be synthesized in our body from

• tyrosine

• tryptophan

• valine

• phenylalanine

Continuous bleeding from an injured part of body is due to deficiency of :

• Vitamin A

• Vitamin B

• Vitamin K

• Vitamin E