SAMPLE MCAT BIOLOGY QUESTIONS

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TOPIC

Enzymes

QUESTION

Some enzymes require the presence of a non-protein molecule to behave catalytically. An enzymes devoid of this molecule is called a (n)

  • Holo enzyme
  • Apo enzyme
  • Co enzyme
  • Zymo enzyme

CORRECT ANSWER

Apo enzyme

EXPLANATION

An Apo enzyme is an inactive enzyme, activation of the enzyme occurs upon binding of an organic or inorganic co-factor. Holo enzyme is an Apo enzyme together with its co-factor. A Holo enzyme is complete and catalytically active. Most co-factors are not covalently bound but instead are tightly bound.

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TOPIC

Bio-energetic

QUESTION

What does NADPH2 provides during the dark reactions?

  • Energized electron only
  • H+ only
  • Both Energized electron and H+
  • H2

CORRECT ANSWER

Both Energized electron and H+

EXPLANATOPN

NADPH2 provides Both Energized electron and H+ during the dark reactions. When NADPH2 splits it gives NADP+, 2eand 2H+

Chemical Equation

NADPH2    ======>    NADP+ + 2e+ 2H+

SAMPLE PHYSICS QUESTION

SAMPLE MATH QUESTION

SAMPLE CHEMISTRY QUESTION

TOPIC

Digestion

QUESTION

Which of these is a function of saliva?

  • Moistening and Lubrication
  • Antisepsis and stabilization of pH
  • Carbohydrate digestion
  • All of above

CORRECT ANSWER

All of above

EXPLANATION

Main ingredients of saliva are:

Mucus causing moistening and lubrication,

Sodium bicarbonate causing antisepsis and pH stabilization

Amylase causing carbohydrate digestion

 

 

 


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