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MCAT Biology Practice Tests

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Free MCAT Biology Diagnostic Tests

Take the Varsity Learning Tools free diagnostic test for MCAT Biology to determine which academic concepts you understand and which ones require your ongoing attention. Each MCAT Biology problem is tagged down to the core, underlying concept that is being tested. The MCAT Biology diagnostic test results highlight how you performed on each area of the test. You can then utilize the results to create a personalized study plan that is based on your particular area of need.

MCAT Biology Diagnostic Test 1

Questions: 60
Test Difficulty:
Average Time Spent: 22 mins

MCAT Biology Diagnostic Test 2

Questions: 60
Test Difficulty:
Average Time Spent: 59 mins

MCAT Biology Diagnostic Test 3

Questions: 60
Test Difficulty:
Average Time Spent: 1 hrs 19 mins

MCAT Biology Diagnostic Test 4

Questions: 60
Test Difficulty:
Average Time Spent: 50 mins

MCAT Biology Diagnostic Test 5

Questions: 60
Test Difficulty:
Average Time Spent: 31 mins

MCAT Biology Diagnostic Test 6

Questions: 40
Test Difficulty:
Average Time Spent: 36 mins

MCAT Biology Diagnostic Test 7

Questions: 59
Test Difficulty:
Average Time Spent: 5 hrs 26 mins

MCAT Biology Diagnostic Test 8

Questions: 59
Test Difficulty:
Average Time Spent: 32 mins

MCAT Biology Diagnostic Test 9

Questions: 60
Test Difficulty:
Average Time Spent: 17 mins

MCAT Biology Diagnostic Test 10

Questions: 59
Test Difficulty:
Average Time Spent: 25 mins

Our free MCAT Biological Sciences Practice Tests are each a selection of 10 to 12 questions, which will give you a cross-section of topics from the Biological Sciences section of the official MCAT. You might think of them as little quizzes, which you can use to hone your skills. Whether you need top MCAT tutors in New YorkMCAT tutors in Chicago, or top MCAT tutors in Los Angeles, working with a pro may take your studies to the next level.

MCAT Biological Sciences Section

What does the MCAT Biological Sciences section cover?

The MCAT Biological Sciences section can be broken into two generalized categories: organic chemistry and biological sciences. When taking this section of the MCAT, test takers are often presented with passages that provide highly specific details about complex biological functions. Questions then require test takers to integrate the provided specific information with generalized biology concepts to draw conclusions. Material in this section includes organic chemistry reactions and mechanisms, cell biology, molecular biology, evolution and genetics, systems biology, and some biochemistry. Varsity Tutors offers resources like free MCAT Biology Diagnostic Tests to help with your self-paced study, or you may want to consider an MCAT Biology tutor.

How many problems are on the MCAT Biological Sciences section, and how much time do I have to complete them?

The MCAT Biological Sciences section consists of 52 questions. 70 minutes are allotted for this section. Approximately 40 to 45 questions will be based on passages, and the remaining questions will be stand-alone questions that do not have any background information provided.

Should I guess on the MCAT Biological Sciences section?

There is no guessing penalty on the MCAT. Scores are based on the number of questions answered correctly, and are not affected by questions skipped or answered incorrectly. It is a good strategy to answer every question on the exam, even if you must guess.

What kinds of problems are on the MCAT Biological Sciences section?

Questions in the MCAT Biological Sciences section can be passage-based or discrete. Discrete questions will generally be straightforward, asking for identification of biological terms and concepts or conclusions based on one to two sentences. Passage-based questions vary in content and structure. Some passages provide information about certain processes, while others provide experimental setups or data for analysis. Be prepared to identify new information that is provided in the passages and draw connections to your experiences with college coursework and material. Many questions will require application of general biological concepts to specific scenarios described in the passages.

How can I prepare for the MCAT Biological Sciences section?

Varsity Tutors’ Learning Tools feature Full-Length MCAT Biological Sciences Practice Tests to assist you in evaluating your overall preparation level. The exam simulating format of the complete practice tests can guide you in learning to pace yourself in order to ensure you’ll have enough time to finish the entire section. These free Practice Tests can also assist you in building a personalized review plan, as the results page will reveal which of the concepts you’ve already mastered, and which concepts may need some additional review. The results pages for the full-length tests also offer other helpful study resources, like clear, detailed explanations of the correct answers and links to additional online study resources. After you’ve done a thorough review, you can assess your knowledge by taking another Full-Length MCAT Biological Sciences Practice Test to check your progress. Other free MCAT Biological Sciences Practice Tests consist of a concept-specific selection of 10 to 12 questions, which will give you a cross-section of topics from the Biological Sciences section of the official MCAT. You might think of them as little quizzes, which you can use to hone your skills. In addition to the MCAT Biology Practice Tests and MCAT Biology tutoring, you may also want to consider using some of our MCAT Biology flashcards.

Free MCAT Biology Practice Tests

Our completely free MCAT Biology practice tests are the perfect way to brush up your skills. Take one of our many MCAT Biology practice tests for a run-through of commonly asked questions. You will receive incredibly detailed scoring results at the end of your MCAT Biology practice test to help you identify your strengths and weaknesses. Pick one of our MCAT Biology practice tests now and begin!

Practice Tests by Concept

Biology practice test

Questions: 40
Test Difficulty:
Average Time Spent: 27 mins

Cell biology, molecular biology, and genetics practice test

Questions: 17
Test Difficulty:
Average Time Spent: 28 mins

Cellular processes and functions practice test

Questions: 10
Test Difficulty:
Average Time Spent: 9 mins

Cell cycle practice test

Questions: 2
Test Difficulty:
Average Time Spent: 26 secs

Cell signaling practice test

Questions: 2
Test Difficulty:
Average Time Spent: 4 mins

Mitosis and meiosis practice test

Questions: 2
Test Difficulty:
Average Time Spent: 1 mins 47 secs

Other cell processes practice test

Questions: 2
Test Difficulty:
Average Time Spent: 41 secs

Photosynthesis practice test

Questions: 1
Test Difficulty:
Average Time Spent: 26 secs

Cellular structures and organelles practice test

Questions: 6
Test Difficulty:
Average Time Spent: 2 mins 58 secs

Endoplasmic reticulum and golgi body practice test

Questions: 11
Test Difficulty:
Average Time Spent: 5 mins

Intercellular junctions practice test

Questions: 5
Test Difficulty:
Average Time Spent: 7 mins

Mitochondria and chloroplasts practice test

Questions: 9
Test Difficulty:
Average Time Spent: 7 mins

Nucleus and nucleolus practice test

Questions: 7
Test Difficulty:
Average Time Spent: 4 mins

Other cell structures practice test

Questions: 6
Test Difficulty:
Average Time Spent: 3 mins

Plasma membrane and proteins practice test

Questions: 6
Test Difficulty:
Average Time Spent: 10 mins

Ribosomes and cytoskeleton practice test

Questions: 18
Test Difficulty:
Average Time Spent: 9 mins

Dna, rna, and proteins practice test

Questions: 28
Test Difficulty:
Average Time Spent: 17 mins

Dna and rna sequencing practice test

Questions: 5
Test Difficulty:
Average Time Spent: 7 mins

Dna replication and repair practice test

Questions: 9
Test Difficulty:
Average Time Spent: 4 mins

Regulation mechanisms and epigenetics practice test

Questions: 4
Test Difficulty:
Average Time Spent: 3 mins

Transcription practice test

Questions: 2
Test Difficulty:
Average Time Spent: 1 mins 10 secs

Translation practice test

Questions: 2
Test Difficulty:
Average Time Spent: 18 secs

Genetics practice test

Questions: 17
Test Difficulty:
Average Time Spent: 5 mins

Genes and chromosomes practice test

Questions: 6
Test Difficulty:
Average Time Spent: 3 mins

Genetic abnormalities and mutation practice test

Questions: 2
Test Difficulty:
Average Time Spent: 1 mins 32 secs

Genetic regulation and transcription factors practice test

Questions: 2
Test Difficulty:
Average Time Spent: 23 secs

Mendel and inheritance patterns practice test

Questions: 39
Test Difficulty:
Average Time Spent: 26 mins

Population genetics and hardy-weinberg practice test

Questions: 18
Test Difficulty:
Average Time Spent: 24 mins

Recombination and meiosis practice test

Questions: 3
Test Difficulty:
Average Time Spent: 1 mins 5 secs

Evolution practice test

Questions: 3
Test Difficulty:
Average Time Spent: 1 mins 34 secs

Evidence of evolution practice test

Questions: 1
Test Difficulty:

Natural selection practice test

Questions: 4
Test Difficulty:
Average Time Spent: 2 mins 28 secs

Other evolution principles practice test

Questions: 2
Test Difficulty:
Average Time Spent: 1 mins 10 secs

Speciation and phylogenetics practice test

Questions: 5
Test Difficulty:
Average Time Spent: 1 mins 51 secs

Types of evolution and speciation practice test

Questions: 3
Test Difficulty:
Average Time Spent: 2 mins 13 secs

Microbiology practice test

Questions: 40
Test Difficulty:
Average Time Spent: 10 mins

Bacteria and types of prokaryotes practice test

Questions: 33
Test Difficulty:
Average Time Spent: 10 mins

Fungi practice test

Questions: 7
Test Difficulty:
Average Time Spent: 1 mins 57 secs

Other microbiology concepts practice test

Questions: 3
Test Difficulty:
Average Time Spent: 47 secs

Prokaryotic genetics practice test

Questions: 15
Test Difficulty:
Average Time Spent: 5 mins

Prokaryotic reproduction and physiology practice test

Questions: 5
Test Difficulty:
Average Time Spent: 2 mins 28 secs

Viral life cycle practice test

Questions: 7
Test Difficulty:
Average Time Spent: 1 mins 56 secs

Viruses practice test

Questions: 11
Test Difficulty:
Average Time Spent: 4 mins

Other biology concepts practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 49 secs

Other concepts practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 34 secs

Systems biology and tissue types practice test

Questions: 40
Test Difficulty:
Average Time Spent: 2 hrs 58 mins

Circulatory and respiratory systems practice test

Questions: 40
Test Difficulty:
Average Time Spent: 27 mins

Circulatory system practice test

Questions: 40
Test Difficulty:
Average Time Spent: 10 mins

Blood vessels and vasculature practice test

Questions: 3
Test Difficulty:
Average Time Spent: 1 mins 31 secs

Heart practice test

Questions: 22
Test Difficulty:
Average Time Spent: 8 mins

Hemoglobin, blood cells, and blood proteins practice test

Questions: 35
Test Difficulty:
Average Time Spent: 11 mins

Other circulatory physiology practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 37 secs

Pulmonary and systemic circuits practice test

Questions: 9
Test Difficulty:
Average Time Spent: 4 mins

Respiratory system practice test

Questions: 24
Test Difficulty:
Average Time Spent: 9 mins

Gas exchange practice test

Questions: 3
Test Difficulty:
Average Time Spent: 1 mins 24 secs

Other respiratory physiology practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 25 secs

Respiratory structures and lung mechanics practice test

Questions: 15
Test Difficulty:
Average Time Spent: 6 mins

Connective tissue and epithelium practice test

Questions: 11
Test Difficulty:
Average Time Spent: 11 mins

Connective tissue types and properties practice test

Questions: 6
Test Difficulty:
Average Time Spent: 1 mins 21 secs

Epithelial tissue and integumentary system practice test

Questions: 9
Test Difficulty:
Average Time Spent: 4 mins

Endocrine system practice test

Questions: 40
Test Difficulty:
Average Time Spent: 11 mins

Glands practice test

Questions: 22
Test Difficulty:
Average Time Spent: 6 mins

Other endocrine glands practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 2 secs

Ovaries and testes practice test

Questions: 2
Test Difficulty:
Average Time Spent: 49 secs

Pancreas, liver, and kidney practice test

Questions: 5
Test Difficulty:
Average Time Spent: 1 mins 16 secs

Pituitary and hypothalamus practice test

Questions: 11
Test Difficulty:
Average Time Spent: 4 mins

Thyroid and parathyroid practice test

Questions: 2
Test Difficulty:
Average Time Spent: 26 secs

Hormones practice test

Questions: 40
Test Difficulty:
Average Time Spent: 12 mins

Endocrine regulatory mechanisms practice test

Questions: 4
Test Difficulty:
Average Time Spent: 2 mins 22 secs

Hormone mechanisms and effects practice test

Questions: 25
Test Difficulty:
Average Time Spent: 9 mins

Hormone origins and targets practice test

Questions: 8
Test Difficulty:
Average Time Spent: 3 mins

Other hormone physiology practice test

Questions: 6
Test Difficulty:
Average Time Spent: 3 mins

Types of hormones practice test

Questions: 10
Test Difficulty:
Average Time Spent: 3 mins

Excretory and digestive systems practice test

Questions: 40
Test Difficulty:
Average Time Spent: 14 mins

Digestive system practice test

Questions: 40
Test Difficulty:
Average Time Spent: 7 mins

Digestive enzymes and cell types practice test

Questions: 21
Test Difficulty:
Average Time Spent: 5 mins

Other digestive physiology practice test

Questions: 4
Test Difficulty:
Average Time Spent: 23 mins

Pancreas and liver practice test

Questions: 12
Test Difficulty:
Average Time Spent: 14 mins

Stomach and small intestine practice test

Questions: 22
Test Difficulty:
Average Time Spent: 6 mins

Excretory system practice test

Questions: 40
Test Difficulty:
Average Time Spent: 11 mins

Excretory regulation mechanisms practice test

Questions: 9
Test Difficulty:
Average Time Spent: 6 mins

Kidney and nephron physiology practice test

Questions: 32
Test Difficulty:
Average Time Spent: 12 mins

Other excretory physiology practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 20 secs

Immune and lymphatic systems practice test

Questions: 2
Test Difficulty:
Average Time Spent: 23 secs

Immune system practice test

Questions: 40
Test Difficulty:
Average Time Spent: 10 mins

Adaptive and innate immunity practice test

Questions: 7
Test Difficulty:
Average Time Spent: 7 mins

Antibodies and antigens practice test

Questions: 19
Test Difficulty:
Average Time Spent: 5 mins

Immune proteins and signals practice test

Questions: 5
Test Difficulty:
Average Time Spent: 1 mins 20 secs

Other immunity principles practice test

Questions: 9
Test Difficulty:
Average Time Spent: 4 mins

Types of immune system cells practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 54 secs

Lymphatic system practice test

Questions: 2
Test Difficulty:
Average Time Spent: 15 secs

Lymph and fluid balance practice test

Questions: 7
Test Difficulty:
Average Time Spent: 1 mins 37 secs

Lymphoid organs practice test

Questions: 3
Test Difficulty:
Average Time Spent: 38 secs

Other lymphatic physiology practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 38 secs

Musculoskeletal system and muscle tissue practice test

Questions: 40
Test Difficulty:
Average Time Spent: 22 mins

Bone practice test

Questions: 19
Test Difficulty:
Average Time Spent: 6 mins

Bone development and growth practice test

Questions: 3
Test Difficulty:
Average Time Spent: 2 mins 9 secs

Bone marrow and erythropoiesis practice test

Questions: 2
Test Difficulty:
Average Time Spent: 30 secs

Other bone concepts practice test

Questions: 8
Test Difficulty:
Average Time Spent: 2 mins 58 secs

Types of bone cells practice test

Questions: 8
Test Difficulty:
Average Time Spent: 2 mins 47 secs

Muscles and myocytes practice test

Questions: 40
Test Difficulty:
Average Time Spent: 16 mins

Muscle stimulation and contraction practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 24 secs

Other muscle concepts practice test

Questions: 4
Test Difficulty:
Average Time Spent: 2 mins 6 secs

Sarcomeres practice test

Questions: 3
Test Difficulty:
Average Time Spent: 36 secs

Types of muscle cells practice test

Questions: 14
Test Difficulty:
Average Time Spent: 4 mins

Nervous system and nervous tissue practice test

Questions: 40
Test Difficulty:
Average Time Spent: 15 mins

Divisions of the nervous system practice test

Questions: 40
Test Difficulty:
Average Time Spent: 9 mins

Brain and central nervous system practice test

Questions: 6
Test Difficulty:
Average Time Spent: 1 mins 23 secs

Glia practice test

Questions: 10
Test Difficulty:
Average Time Spent: 2 mins 59 secs

Sensory organs practice test

Questions: 26
Test Difficulty:
Average Time Spent: 28 mins

Somatic and autonomic divisions practice test

Questions: 2
Test Difficulty:
Average Time Spent: 34 secs

Sympathetic and parasympathetic divisions practice test

Questions: 7
Test Difficulty:
Average Time Spent: 3 mins

Neurons and action potential practice test

Questions: 37
Test Difficulty:
Average Time Spent: 16 mins

Action potentials and synapse biology practice test

Questions: 5
Test Difficulty:
Average Time Spent: 3 mins

Neuron structure and types of neurons practice test

Questions: 8
Test Difficulty:
Average Time Spent: 3 mins

Neurotransmitters practice test

Questions: 2
Test Difficulty:
Average Time Spent: 58 secs

Other neural physiology practice test

Questions: 2
Test Difficulty:
Average Time Spent: 25 secs

Reproductive system and development practice test

Questions: 40
Test Difficulty:
Average Time Spent: 15 mins

Developmental physiology practice test

Questions: 37
Test Difficulty:
Average Time Spent: 12 mins

Developmental stages and events practice test

Questions: 6
Test Difficulty:
Average Time Spent: 1 mins 18 secs

Embryogenesis practice test

Questions: 22
Test Difficulty:
Average Time Spent: 7 mins

Fetal circulation practice test

Questions: 2
Test Difficulty:
Average Time Spent: 52 secs

Gastrulation and embryonic germ layers practice test

Questions: 14
Test Difficulty:
Average Time Spent: 3 mins

Regulation of developmental processes practice test

Questions: 2
Test Difficulty:
Average Time Spent: 43 secs

Reproductive system practice test

Questions: 9
Test Difficulty:
Average Time Spent: 2 mins 35 secs

Female reproductive physiology practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 6 secs

Male reproductive physiology practice test

Questions: 3
Test Difficulty:
Average Time Spent: 59 secs

Oogenesis and spermatogenesis practice test

Questions: 2
Test Difficulty:
Average Time Spent: 51 secs

Other reproductive physiology practice test

Questions: 2
Test Difficulty:
Average Time Spent: 49 secs

Organic chemistry, biochemistry, and metabolism practice test

Questions: 40
Test Difficulty:
Average Time Spent: 27 mins

Biochemistry and metabolism practice test

Questions: 40
Test Difficulty:
Average Time Spent: 34 mins

Anaerobic metabolic pathways practice test

Questions: 6
Test Difficulty:
Average Time Spent: 2 mins 9 secs

Electron transport chain and oxidative phosphorylation practice test

Questions: 17
Test Difficulty:
Average Time Spent: 8 mins

Glycolysis practice test

Questions: 9
Test Difficulty:
Average Time Spent: 3 mins

Krebs cycle practice test

Questions: 6
Test Difficulty:
Average Time Spent: 2 mins 30 secs

Lipids and metabolism practice test

Questions: 2
Test Difficulty:
Average Time Spent: 49 secs

Other metabolic pathways practice test

Questions: 4
Test Difficulty:
Average Time Spent: 2 mins 8 secs

Macromolecules practice test

Questions: 40
Test Difficulty:
Average Time Spent: 17 mins

Carbohydrates practice test

Questions: 11
Test Difficulty:
Average Time Spent: 4 mins

Properties of carbohydrates practice test

Questions: 4
Test Difficulty:
Average Time Spent: 2 mins 5 secs

Types of carbohydrates practice test

Questions: 4
Test Difficulty:
Average Time Spent: 1 mins 32 secs

Lipids practice test

Questions: 16
Test Difficulty:
Average Time Spent: 5 mins

Properties of lipids practice test

Questions: 9
Test Difficulty:
Average Time Spent: 3 mins

Types of lipids practice test

Questions: 2
Test Difficulty:
Average Time Spent: 35 secs

Nucleic acids practice test

Questions: 24
Test Difficulty:
Average Time Spent: 5 hrs 53 mins

Nucleotides and nucleic acid dervatives practice test

Questions: 1
Test Difficulty:

Structure of dna and rna practice test

Questions: 11
Test Difficulty:
Average Time Spent: 16 mins

Proteins practice test

Questions: 38
Test Difficulty:
Average Time Spent: 10 mins

Amino acids practice test

Questions: 20
Test Difficulty:
Average Time Spent: 7 mins

Enzymes and enzyme inhibition practice test

Questions: 2
Test Difficulty:
Average Time Spent: 1 mins 45 secs

Protein structure practice test

Questions: 10
Test Difficulty:
Average Time Spent: 5 mins

Molecular properties practice test

Questions: 30
Test Difficulty:
Average Time Spent: 43 mins

Covalent bonds and hybrid orbitals practice test

Questions: 26
Test Difficulty:
Average Time Spent: 12 mins

Functional groups and properties practice test

Questions: 2
Test Difficulty:
Average Time Spent: 1 mins 17 secs

Intermolecular forces practice test

Questions: 4
Test Difficulty:
Average Time Spent: 4 mins

Isomerism and stereoisomers practice test

Questions: 23
Test Difficulty:
Average Time Spent: 28 mins

Other properties of biological compounds practice test

Questions: 6
Test Difficulty:
Average Time Spent: 2 mins 36 secs

Properties of hydrocarbons practice test

Questions: 9
Test Difficulty:
Average Time Spent: 4 mins

Organic analyses and lab techniques practice test

Questions: 40
Test Difficulty:
Average Time Spent: 19 mins

Compound identification practice test

Questions: 21
Test Difficulty:
Average Time Spent: 9 mins

Compound purification practice test

Questions: 5
Test Difficulty:
Average Time Spent: 1 mins 57 secs

Compound quantification practice test

Questions: 1
Test Difficulty:

Other techniques practice test

Questions: 3
Test Difficulty:
Average Time Spent: 54 secs

Reactions practice test

Questions: 2
Test Difficulty:
Average Time Spent: 1 mins 13 secs

Reaction mechanisms practice test

Questions: 9
Test Difficulty:
Average Time Spent: 6 mins

Other reaction mechanisms practice test

Questions: 2
Test Difficulty:
Average Time Spent: 1 mins 6 secs

Oxidation reactions practice test

Questions: 1
Test Difficulty:

Reduction reactions practice test

Questions: 1
Test Difficulty:
Average Time Spent: 28 secs

Substitution and elimination mechanisms practice test

Questions: 9
Test Difficulty:
Average Time Spent: 5 mins

Reaction types practice test

Questions: 2
Test Difficulty:
Average Time Spent: 1 mins 5 secs

Other reactions practice test

Questions: 4
Test Difficulty:
Average Time Spent: 2 mins 17 secs

Reactions with carboxylic acids practice test

Questions: 1
Test Difficulty:
Average Time Spent: 56 secs

Reactions with hydrocarbons practice test

Questions: 8
Test Difficulty:
Average Time Spent: 7 mins

Reactions with ketones and aldehydes practice test

Questions: 3
Test Difficulty:
Average Time Spent: 1 mins 28 secs

Reactions with nitrogen compounds practice test

Questions: 1
Test Difficulty:
Average Time Spent: 25 secs
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