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MDCAT Entry Test 2026: 100 Most Repeated Biology MCQs (PMDC Syllabus)

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Q.1
The fluid mosaic model of the cell membrane was proposed by:
A) Singer and Nicolson
B) Watson and Crick
C) Robert Hooke
D) Theodor Schwann
✅ Correct Answer: Option A
Exp: S.J. Singer and G.L. Nicolson proposed the Fluid Mosaic Model in 1972, which describes the cell membrane as a fluid lipid bilayer with embedded proteins.
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Q.2
Which organelle is known as the "Powerhouse" of the cell?
A) Ribosome
B) Nucleus
C) Mitochondrion
D) Golgi Apparatus
✅ Correct Answer: Option C
Exp: Mitochondria are called powerhouses because they generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy.
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Q.3
The process of programmed cell death is called:
A) Necrosis
B) Apoptosis
C) Lysis
D) Plasmolysis
✅ Correct Answer: Option B
Exp: Apoptosis is a highly regulated and controlled process of programmed cell death that occurs in multicellular organisms.
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Q.4
Ribosomes are synthesized in the:
A) Nucleolus
B) Cytoplasm
C) Endoplasmic Reticulum
D) Lysosome
✅ Correct Answer: Option A
Exp: The nucleolus, located within the nucleus, is the site of ribosomal RNA (rRNA) transcription and processing, and of ribosome assembly.
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Q.5
Enzymes are primarily made of:
A) Carbohydrates
B) Lipids
C) Proteins
D) Nucleic Acids
✅ Correct Answer: Option C
Exp: Almost all enzymes are proteins, made up of chains of amino acids linked together by peptide bonds.

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