Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one of the following is a matching pair of a certain body feature and its value/count in a normal human adult?

  • Urea- 5 - 10 mg/100 ml of blood

  • Blood sugar (fasting) - 80 - 100 mg/100 ml

  • Total blood volume - 3 - 4 litres

  • ESR in Wintrobe method - 9 -15 mm in males and 20 - 34 mm in females


2.

Which one of the following is a matching pair?

  • Lubb - sharp closure of AV valves at the beginning of ventricular systole

  • Dup - sudden opening of semilunar valves at the beginning of ventricular diastole

  • Pulsation of the radial artery - valves in the blood vessels

  • Initiation of the heart beat - Purkinje fibres


3.

Which one of the following is a sesamoid bone?

  • Pelvis

  • Patella

  • Pterygoid

  • Pectoral girdle


4.

Photorespiration in C3 plants starts from:

  • phosphoglycerate

  • phosphoglycolate

  • glycerate

  • glycine


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5.

A person passes much urine and drinks much water but his blood glucose level is normal. This condition may be the result of:

  • a reduction in insulin secretion from pancreas

  • a reduction in vasopressin secretion from posterior pituitary

  • a fall in the glucose concentration in urine

  • an increase in secretion of glucagon


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6.

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


A.

succinic dehydrogenase by malonic acid

In competitive inhibition, an inhibitor that resembles the normal substrate binds to the enzyme, usually at the active site and prevents the substrate from binding. 

An example of competitive inhibition of an enzyme is the inhibition of succinic dehydrogenase by malonic acid. It is the simple type of competitive inhibition. A competitive inhibitor resembles the substrate and binds to the active site of the enzyme. The substrate is then prevented from binding to the same active site.


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7.

Excessive stimulation of vagus nerve in humans may lead to:

  • hoarse voice

  • peptic ulcers

  • efficient digestion of proteins

  • irregular contractions of diaphragm


8.

A person is wearing spectacles with concave lenses for correcting vision. While not using the glasses, the image of a distant object in his case will be formed

  • on the blind spot

  • behind the retina

  • in front of the retina

  • on the yellow spot


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9.

The source of somatostatin is same as that of

  • thyroxine and calcitonin

  • insulin and glucagon

  • somatotropin and prolactin

  • vasopresin and oxytocin


10.

People recovering from long illness are often advised to include the alga Spirulina in their diet because it

  • makes the food easy to digest

  • is rich in proteins

  • has antibiotic properties

  • restores the intestinal microtlora


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