Biology Quiz – 20 MCQ Questions with Answers

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Biology Basics Quiz – 20 MCQ Questions with Answers

Take this Biology Basics Quiz featuring 20 multiple-choice questions on cells, DNA, enzymes, ecosystems, and core biology concepts. Perfect for students and exam practice.

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1) Which theory explains how species change over time?

A. Germ theory

B. Cell theory

C. Evolution

D. Atomic theory

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2) Proteins are made from smaller units called?

A. Amino acids

B. Sugars

C. Nucleotides

D. Fatty acids

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3) A community of organisms interacting with the environment is a?

A. Population

B. Ecosystem

C. Habitat

D. Organ

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4) Animals that obtain energy by eating other organisms are?

A. Photosynthesizers

B. Autotrophs

C. Consumers

D. Producers

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5) Organisms that make their own food are called?

A. Consumers

B. Decomposers

C. Predators

D. Producers

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6) All chemical reactions in a living organism are known as?

A. Respiration

B. Digestion

C. Metabolism

D. Circulation

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7) Which structure carries genes and is made of DNA and protein?

A. Cytoplasm

B. Vacuole

C. Chromosome

D. Ribosome

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8) A segment of DNA that codes for a trait is called?

A. Chromosome

B. Protein

C. Cell

D. Gene

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9) Movement of molecules from high to low concentration is called?

A. Diffusion

B. Active transport

C. Filtration

D. Osmosis

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10) What structure contains genetic material in eukaryotic cells?

A. Cell wall

B. Cytoplasm

C. Mitochondria

D. Nucleus

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11) What biological molecules speed up chemical reactions?

A. Enzymes

B. Lipids

C. Carbohydrates

D. Vitamins

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12) What term describes maintaining stable internal conditions?

A. Evolution

B. Mutation

C. Homeostasis

D. Adaptation

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13) Which molecule is known as the energy currency of the cell?

A. RNA

B. DNA

C. Glucose

D. ATP

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14) Which structure controls what enters and leaves the cell?

A. Nucleus

B. Vacuole

C. Ribosome

D. Cell membrane

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15) What is the movement of water across a semi-permeable membrane called?

A. Respiration

B. Osmosis

C. Diffusion

D. Transport

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16) What process converts sunlight into chemical energy?

A. Respiration

B. Photosynthesis

C. Digestion

D. Fermentation

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17) Where does photosynthesis occur in plant cells?

A. Nucleus

B. Mitochondria

C. Chloroplast

D. Cell membrane

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18) Which organelle produces energy for the cell?

A. Ribosome

B. Nucleus

C. Golgi apparatus

D. Mitochondria

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19) Which molecule carries genetic information?

A. Lipid

B. DNA

C. Carbohydrate

D. Protein

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20) What is the basic unit of life?

A. Tissue

B. Organ

C. Atom

D. Cell

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