Animals with the greatest number of similarities are grouped together in which category?
Correct answer A. Genus
Topic / 70 questions
Biology Diagnostic MCQs
Biology Diagnostic MCQs are mixed multiple-choice questions drawn from across the pre-medical biology syllabus, used to test your overall readiness in cells, enzymes, genetics, evolution, microorganisms and plant physiology. They help MDCAT and medical entry aspirants find weak chapters. Every question has an instant answer so you can diagnose gaps as you go.
- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
Which of these relationships is NOT an example of symbiosis?
Correct answer D. Marchantia sporophyte and gametophyte
In most ecosystems, through which group does the greatest amount of energy flow?
Correct answer B. Herbivores
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In humans, which structure is formed or modified from the embryonic gill pouches?
Correct answer D. Eustachian tube
About how long ago did the first eukaryotes appear?
Correct answer D. 1.5 billion
According to Lamarck, evolution took place as a result of what?
Correct answer C. Inheritance of acquired characters
Which enzyme can break open a plasmid ring?
Correct answer D. Restriction endonuclease
In which disease is the transmembrane carrier for chloride ions not produced?
Correct answer D. Cystic fibrosis
What is a genome?
Correct answer B. Full set of genes of an individual
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In which cells will genes not be found in pairs?
Correct answer B. Sperm cells of frog
Which phase of the cell cycle comes immediately before mitosis?
Correct answer B. G2 phase
What is the correct sequence of the stages of prophase I of meiosis?
Correct answer B. Leptotene, zygotene, pachytene, diplotene, diakinesis
How many tetrads are formed during mitosis in humans?
Correct answer A. 0
What is the sequence of three bases on tRNA that pairs with a codon on mRNA called?
Correct answer C. Anticodon
Which of the following is a correct description of DNA transcription?
Correct answer D. It produces mRNA
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At which stage of development does a cavity first appear?
Correct answer D. Blastula
What is the basic structural unit of a chromosome?
Correct answer D. Nucleosome
What is the stimulation of flowering in plants by exposure to low temperatures called?
Correct answer B. Vernalisation
Which cells in the testes secrete testosterone?
Correct answer A. Interstitial cells
What type of learning involves a reduced or lost response to a repeated stimulus?
Correct answer B. Habituation
About Biology Diagnostic MCQs
This set from the MCAT Biology section mixes chapters on purpose. One question may ask about enzymes that break dipeptides into amino acids, the next about the transcription of DNA, the anticodon on tRNA or the cell wall of oomycetes. Others cover why mycoplasmas are classed with bacteria, Lamarck's ideas on evolution, sleep movements in plants, stomatal movement and the small share of sunlight used in photosynthesis.
Because medical entry tests jump between topics without warning, a diagnostic set is a good way to check whether your revision holds up under mixed conditions. Use your results to decide which chapters need another reading. Regular mixed practice also builds the stamina and speed needed for MDCAT in Pakistan, NEET UG in India and the MBBS admission test in Bangladesh, where biology carries a large share of marks.
Key facts to remember
- The anticodon on tRNA is a three-base sequence complementary to an mRNA codon.
- Lamarck proposed that evolution occurs through the inheritance of acquired characteristics.
- Mycoplasmas are bacteria that lack a cell wall.
- The cell wall of oomycetes is mainly composed of cellulose, unlike the chitin of true fungi.
- Amino acids differ from each other because of their variable side chain, the R group.
- Peptidases are hydrolase enzymes that break peptide bonds.
Exams that include Biology Diagnostic MCQs
Pakistan
- MDCAT
- ETEA
- NTS
- Army/Navy/PAF initial tests
India
- NEET UG
- CUET
- ICAR AIEEA
Bangladesh
- Medical admission test (MBBS)
- University admission tests (DU, RU, JU)
How to prepare for Biology Diagnostic MCQs
- Attempt the set in one sitting under a time limit, then list every chapter where you lost marks.
- Revise molecular biology terms such as codon, anticodon, transcription and translation side by side to avoid confusion.
- For classification questions, learn the defining feature of each group, such as no cell wall in mycoplasmas.
- Repeat a diagnostic set after two weeks of focused revision to see whether weak chapters have improved.
Frequently asked questions
What is a Biology Diagnostic MCQ set?
It is a mixed set of biology questions covering many chapters at once, designed to show where your preparation is strong or weak. Unlike chapter tests, it mirrors the unpredictable order of real medical entry exams like MDCAT and NEET UG.
How many Biology Diagnostic MCQs are on MCQs360?
There are 105 Biology Diagnostic MCQs on MCQs360 in the MCAT Biology section. Each question gives an instant answer, and you can practise the whole set free without an account. The mix of chapters makes it a practical self-check before a full mock test.
What is the difference between a codon and an anticodon?
A codon is a sequence of three bases on mRNA that specifies an amino acid. An anticodon is the complementary three-base sequence on tRNA that pairs with the codon during translation, so the correct amino acid is added to the growing protein.
How should I use diagnostic MCQs for MDCAT preparation?
Take a diagnostic set early to find weak chapters, study those chapters from your textbook, then retest. Track your score each time. Mixed practice in the final weeks also builds speed and helps you switch topics quickly, as the real paper requires.
Last reviewed October 2026