SAMPLE BIOLOGY QUESTIONS FROM PAKPREP.COM

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Topic:

Bioenergetics

Question:

Which one is correct for dark reactions?

Options:

  • It takes place in light only
  • It can take place in dark
  • It stops in the light
  • It can take place in both light and dark

Correct Option:

It can take place in both light and dark

Explanation:

The correct statement about dark reactions is that it can take place equally in both light and dark, provided ATP and NADPH of the light reactions are available. In other means the light has no effect on it. The essential thing is that ATP and NADPH must be available.

Topic:

Digestion

Question:

Which of these is not because of backward movement of tongue?

Options:

  • Upward movement of soft palate
  • Closing of nasal opening at back
  • Closure of glottis
  • Peristalsis in esophagus

Correct Option:

Peristalsis in esophagus

Explanation:

First 3 are because of backward movement of tongue, but once food reaches back of mouth swallowing becomes automatic.

Topic:

Enzymes

Question:

The view that active site of an enzyme is flexible and when a substrate combines with it, cause changes in enzymes structure is known as:

Options:

  • Lock and key model
  • Induce fit model
  • Sliding filament model
  • Specificity model

Correct Option:

Induce fit model

Explanation:

According to induce fit model active site of enzyme is flexible and changes take place at this site.

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