Skip to content
Independent guidance for Pakistan's healthcare students
Student forum · Coming soonAggregate calculator
Medical AdmissionPAKISTAN
Practice MDCAT

LEARN AT YOUR OWN PACE

MDCAT Question Bank

Think through each question, then reveal the answer and explanation.

Take a practice test →

Use the MDCAT Question Bank to study by subject and try each question yourself.
Click Show Answer to check the correct choice, then take a practice test when you’re ready.

1009 available questions

Biology · Question 601

In intestinal cells, chylomicrons are assembled mainly from which two classes of substance?

  1. Proteins and carbohydrates
  2. Fats and proteins
  3. Fats and carbohydrates
  4. Vitamins and fats
Show AnswerHide Answer

Correct answer: B

Fats and proteins

Chylomicrons are lipoprotein particles containing dietary lipids and apolipoproteins.

Biology · Question 602

Which part of the brain acts as the body's thermostat?

  1. Pituitary gland
  2. Kidneys
  3. Hypothalamus
  4. Adrenal gland
Show AnswerHide Answer

Correct answer: C

Hypothalamus

The hypothalamus monitors body temperature and coordinates thermoregulatory responses.

Biology · Question 603

The thick and thin filaments of a myofibril are composed mainly of which proteins, respectively?

  1. Myosin and actin
  2. Globulin and albumin
  3. Troponin and tropomyosin
  4. Fibrin and fibrinogen
Show AnswerHide Answer

Correct answer: A

Myosin and actin

Thick filaments contain myosin, while thin filaments are built chiefly from actin.

Biology · Question 604

Which hormone is a steroid?

  1. ADH
  2. Thyroxine
  3. Cortisone
  4. Insulin
Show AnswerHide Answer

Correct answer: C

Cortisone

Cortisone is a corticosteroid synthesized from cholesterol.

Biology · Question 605

Which brain region chiefly coordinates voluntary movement and balance?

  1. Medulla
  2. Amygdala
  3. Cerebellum
  4. Pons
Show AnswerHide Answer

Correct answer: C

Cerebellum

The cerebellum coordinates movement, posture and balance.

Biology · Question 606

The risk of Rh incompatibility in pregnancy exists when an Rh-negative mother carries a fetus that may be Rh-positive because the father is:

  1. Rh-negative
  2. Rh-positive
  3. Haemophilic
  4. Colour-blind
Show AnswerHide Answer

Correct answer: B

Rh-positive

An Rh-positive father may pass the Rh-positive allele to the fetus, creating incompatibility with an Rh-negative mother.

Chemistry · Question 607

Why do many elements have fractional relative atomic masses?

  1. Each atom has a fractional mass number
  2. They are averages of isobar masses
  3. They are simple averages of isotope masses
  4. They are isotope-mass averages weighted by natural abundance
Show AnswerHide Answer

Correct answer: D

They are isotope-mass averages weighted by natural abundance

Relative atomic mass is the abundance-weighted mean of the masses of an element's naturally occurring isotopes.

Chemistry · Question 608

Which pair of compounds has the same empirical formula?

  1. H2O and H2O2
  2. C6H12 and C6H6
  3. H2S2O3 and H2SO4
  4. C6H12O6 and CH3COOH
Show AnswerHide Answer

Correct answer: D

C6H12O6 and CH3COOH

Both C6H12O6 and CH3COOH reduce to the empirical formula CH2O.

Chemistry · Question 609

Approximately how many entities are present in one mole of a substance?

  1. 6.02 × 10^23
  2. 6.02 × 10^24
  3. 6.02 × 10^22
  4. 3.01 × 10^23
Show AnswerHide Answer

Correct answer: A

6.02 × 10^23

One mole contains Avogadro's number, approximately 6.02 × 10^23 entities.

Chemistry · Question 610

Which subshell is filled immediately before 4p in the usual Aufbau order?

  1. 4s
  2. 2p
  3. 3d
  4. 1s
Show AnswerHide Answer

Correct answer: C

3d

The relevant Aufbau sequence is 4s, then 3d, then 4p.