MDCAT Practice MCQs MCQs Practice Set for October 17, 2026
Preparing for the Medical and Dental College Admission Test requires strong subject knowledge and regular practice with timed questions. Use these original MDCAT-style MCQs to review common concepts in Biology, Chemistry, Physics and English, then revisit any topics where your answers need improvement.
Why this MDCAT Practice MCQs set is useful
Prepare for the MDCAT with 100 original MCQs and answers covering Biology, Chemistry, Physics and English. This MDCAT practice set supports medical and dental college entry test preparation through concept-based questions on cell biology, human physiology, genetics, chemical principles, mechanics, electricity and language skills. Start with this focused set, then continue with the MCQsBase question bank, online quiz practice, past papers, and the complete MCQsBase blog.
Test focus topics
| No. | Focus Area | What to Practice |
|---|---|---|
| 1 | Biology | Cell structure, enzymes, biomolecules, genetics, human physiology, reproduction, evolution and ecology. |
| 2 | Chemistry | Atomic structure, periodic trends, bonding, stoichiometry, acids and bases, equilibrium, organic chemistry and electrochemistry. |
| 3 | Physics | Units and measurements, kinematics, forces, work and energy, waves, optics, electricity and magnetism. |
| 4 | English | Vocabulary in context, grammar, sentence completion and basic comprehension skills. |
| 5 | Test strategy | Solve questions under a time limit, mark uncertain items and review the concepts behind incorrect answers. |
What this set covers
| Section | Questions | Focus |
|---|---|---|
| Set 1 | 1-20 | Core MDCAT Practice MCQs fundamentals |
| Set 2 | 21-40 | Frequently repeated test concepts |
| Set 3 | 41-60 | Mixed exam-style practice |
| Set 4 | 61-80 | Fast recall and elimination practice |
| Set 5 | 81-100 | Final revision and score-building |
Choose one option, then check the bold answer.
Which organelle is the primary site of aerobic ATP production in a eukaryotic cell?
Correct Answer
B) Mitochondrion
Which type of molecule forms the main structural framework of a cell membrane?
Correct Answer
A) Phospholipid
What is the basic structural and functional unit of the kidney?
Correct Answer
B) Nephron
Which cell structure is the main site of protein synthesis?
Correct Answer
A) Ribosome
Which nitrogenous base is present in RNA but not in DNA?
Correct Answer
B) Uracil
What is the main role of an enzyme in a biochemical reaction?
Correct Answer
B) To lower activation energy
Which component of blood is primarily responsible for oxygen transport?
Correct Answer
B) Red blood cells
Where does gas exchange between air and blood occur in the lungs?
Correct Answer
C) Alveoli
Which hormone lowers blood glucose concentration by promoting cellular uptake of glucose?
Correct Answer
B) Insulin
Which blood group is considered the universal red-cell donor when Rh factor is also considered?
Correct Answer
B) O negative
Which process produces two genetically similar daughter cells for growth and repair?
Correct Answer
B) Mitosis
How many chromosomes are normally present in a human gamete?
Correct Answer
A) 23
Which term describes different versions of the same gene?
Correct Answer
A) Alleles
In a cross between two heterozygous individuals, Aa × Aa, what is the probability of an aa offspring?
Correct Answer
B) 25%
Which molecule carries genetic instructions from DNA to a ribosome during protein synthesis?
Correct Answer
A) mRNA
Which process converts light energy into chemical energy in plants?
Correct Answer
B) Photosynthesis
In which organelle does photosynthesis occur in plant cells?
Correct Answer
A) Chloroplast
What is the main function of xylem in a vascular plant?
Correct Answer
A) Transporting water and mineral ions
Which plant tissue primarily transports sugars from leaves to other parts of the plant?
Correct Answer
B) Phloem
Which part of the brain is chiefly involved in balance and coordination of movement?
Correct Answer
A) Cerebellum
Choose one option, then check the bold answer.
Which structure controls the amount of light entering the eye?
Correct Answer
B) Iris
Which part of a neuron carries impulses away from the cell body?
Correct Answer
B) Axon
Which type of joint allows movement in many directions, as in the shoulder?
Correct Answer
B) Ball-and-socket joint
Where does most absorption of digested nutrients occur in humans?
Correct Answer
B) Small intestine
Which enzyme in saliva begins the digestion of starch?
Correct Answer
B) Salivary amylase
What is the main function of bile in digestion?
Correct Answer
B) Emulsifying fats
Which blood vessels carry blood away from the heart?
Correct Answer
B) Arteries
What is the functional filtering unit of the lung?
Correct Answer
A) Alveolus
Which process releases energy from glucose in the absence of oxygen?
Correct Answer
B) Anaerobic respiration
What is the role of decomposers in an ecosystem?
Correct Answer
A) They recycle nutrients by breaking down dead material
Which ecological term describes an organism's role and position in its environment?
Correct Answer
B) Niche
Natural selection acts directly on differences in which feature?
Correct Answer
A) Phenotype
Which type of immunity results from receiving ready-made antibodies?
Correct Answer
B) Passive immunity
Which cells produce antibodies in the adaptive immune response?
Correct Answer
A) B lymphocytes
Which structure connects a muscle to a bone?
Correct Answer
B) Tendon
What is the atomic number of an element equal to?
Correct Answer
A) Number of protons
Which subatomic particle has a negative electric charge?
Correct Answer
C) Electron
Isotopes of the same element have different numbers of which particles?
Correct Answer
B) Neutrons
Across a period from left to right, atomic radius generally tends to do what?
Correct Answer
B) Decrease
What type of bond forms when atoms share electron pairs?
Correct Answer
B) Covalent bond
Choose one option, then check the bold answer.
What is the approximate pH of a neutral aqueous solution at 25°C?
Correct Answer
B) 7
According to the Brønsted–Lowry definition, an acid is a substance that does what?
Correct Answer
B) Donates a proton
How many moles are present in 18 grams of water? (Molar mass of water = 18 g mol⁻¹)
Correct Answer
B) 1 mol
What is the empirical formula of a compound with molecular formula C₆H₁₂O₆?
Correct Answer
A) CH₂O
Which gas is produced when an acid reacts with a carbonate?
Correct Answer
C) Carbon dioxide
What is the oxidation number of oxygen in most of its compounds?
Correct Answer
A) −2
Which statement about a catalyst is correct?
Correct Answer
C) It provides an alternative pathway with lower activation energy
At constant temperature, what happens to the volume of a fixed amount of gas when its pressure increases?
Correct Answer
B) It decreases
Which intermolecular force is especially important between water molecules?
Correct Answer
A) Hydrogen bonding
What is the products side of the Haber process equilibrium?
Correct Answer
B) Ammonia
Which functional group is characteristic of alcohols?
Correct Answer
A) −OH
What is the IUPAC name of CH₃CH₂OH?
Correct Answer
B) Ethanol
Which class of organic compounds contains the functional group −COOH?
Correct Answer
B) Carboxylic acids
What type of reaction converts an alkene into an alkane by adding hydrogen?
Correct Answer
A) Addition
Which element is commonly used as the standard reference for atomic mass, assigned a value of exactly 12?
Correct Answer
B) Carbon-12
In an electrochemical cell, oxidation occurs at which electrode?
Correct Answer
A) Anode
Which solution has the highest hydrogen ion concentration?
Correct Answer
A) pH 2
What is the main product when a strong acid reacts completely with a strong base?
Correct Answer
A) A salt and water
Which type of hydrocarbon contains at least one carbon–carbon double bond?
Correct Answer
B) Alkene
What is the SI unit of force?
Correct Answer
B) Newton
Choose one option, then check the bold answer.
What is the SI unit of work?
Correct Answer
B) Joule
A car travels 120 metres in 10 seconds. What is its average speed?
Correct Answer
B) 12 m s⁻¹
What is the acceleration of an object moving with constant velocity in a straight line?
Correct Answer
A) Zero
Which quantity is the product of mass and velocity?
Correct Answer
B) Momentum
According to Newton's third law, action and reaction forces act on what?
Correct Answer
B) Different objects in opposite directions
What is the weight of a 2 kg object on Earth if g = 9.8 m s⁻²?
Correct Answer
C) 19.6 N
Which form of energy does a moving object possess because of its motion?
Correct Answer
B) Kinetic energy
A force of 10 N moves an object 3 m in the direction of the force. How much work is done?
Correct Answer
C) 30 J
What is the SI unit of power?
Correct Answer
A) Watt
Which principle explains why pressure applied to an enclosed fluid is transmitted throughout the fluid?
Correct Answer
A) Pascal's principle
What happens to the buoyant force on an object when it displaces a greater weight of fluid?
Correct Answer
B) It increases
What is the approximate speed of sound in air at room temperature?
Correct Answer
B) 340 m s⁻¹
The distance between two consecutive crests of a wave is called its what?
Correct Answer
B) Wavelength
If the frequency of a wave is 5 Hz, what is its period?
Correct Answer
A) 0.2 s
Which type of wave requires a material medium to travel?
Correct Answer
C) Sound wave
What is the angle of reflection, measured from the normal, equal to?
Correct Answer
A) The angle of incidence
Which lens is thicker at the centre than at the edges and converges parallel rays?
Correct Answer
B) Convex lens
What is the SI unit of electric current?
Correct Answer
C) Ampere
A current of 2 A flows through a 5 Ω resistor. What is the potential difference across it?
Correct Answer
C) 10 V
In a series circuit, which quantity is the same through every component?
Correct Answer
A) Current
Choose one option, then check the bold answer.
What happens to the total resistance when identical resistors are added in series?
Correct Answer
A) It increases
Which device converts electrical energy into mechanical energy?
Correct Answer
A) Electric motor
In which direction does the magnetic field around a straight current-carrying wire form?
Correct Answer
A) In concentric circles around the wire
Choose the closest meaning of the word “abundant.”
Correct Answer
A) Plentiful
Choose the opposite of “expand.”
Correct Answer
B) Contract
Which sentence uses subject–verb agreement correctly?
Correct Answer
B) The list of books is on the desk.
Choose the correctly spelled word.
Correct Answer
B) Separate
Select the correct word: “The students submitted ___ assignments before the deadline.”
Correct Answer
B) their
Choose the grammatically correct sentence.
Correct Answer
A) She has lived here for five years.
Which word is an adverb in the sentence “The athlete ran quickly”?
Correct Answer
D) quickly
Complete the analogy: Heart is to circulation as lungs are to ___.
Correct Answer
B) Respiration
If all mammals are warm-blooded and a whale is a mammal, which conclusion follows?
Correct Answer
A) A whale is warm-blooded.
A student answers 8 of 10 questions correctly. What percentage is correct?
Correct Answer
C) 80%
Choose the correct passive form of “The researcher measured the sample.”
Correct Answer
B) The sample was measured by the researcher.
Which option best completes the sentence: “Although the experiment was difficult, the team ___ it successfully.”
Correct Answer
A) completed
Choose the word closest in meaning to “accurate.”
Correct Answer
A) Correct
If a test begins at 9:15 a.m. and lasts 2 hours, when does it end?
Correct Answer
C) 11:15 a.m.
Which sentence is punctuated correctly?
Correct Answer
B) After the lecture, we reviewed our notes.
Complete the sequence: 3, 6, 12, 24, ___.
Correct Answer
C) 48
Which word is the best antonym of “temporary”?
Correct Answer
B) Permanent
How to revise this MDCAT Practice MCQs set
- Attempt the questions before checking the answers to identify genuine knowledge gaps.
- Review the relevant concept after every incorrect answer instead of memorizing the answer alone.
- Keep a short error log grouped by Biology, Chemistry, Physics and English.
- Practice calculations with units and check whether each result is reasonable.
- Use timed mixed-subject practice to build accuracy when switching between topics.
Frequently Asked Questions
What subjects are covered in this MDCAT MCQ practice set?
The set covers Biology, Chemistry, Physics and English concepts commonly used in medical entry test preparation.
Are these questions copied from an official MDCAT paper?
No. These are original practice questions written in an exam-style format; they are not represented as questions from an official paper.
How should I use these MDCAT MCQs?
Attempt them without looking at the answers, check your results, and revise the concepts behind any mistakes. You can also use a timer for a more test-like practice session.
Do these MCQs guarantee coverage of the complete MDCAT syllabus?
No. They provide a focused practice sample and should be used alongside the current syllabus and other study resources.
Final Takeaway
Consistent daily MCQ practice is one of the simplest ways to improve recall, speed, and exam confidence. Bookmark this page, complete the 100 MDCAT Practice MCQs MCQs, and continue your preparation on McqsBase.