Biology Quiz: Cells, DNA, Genetics and Evolution

This biology quiz covers the science of life, from cells, mitochondria and mitosis to DNA, human chromosomes, Gregor Mendel's peas, Charles Darwin's natural selection, Robert Hooke's microscope and the kingdom of fungi. Ten questions, 90 seconds.

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🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 90 Seconds

Question 1 / 10 Time: 90s

Genetics
Which molecule's double-helix structure was described by Watson and Crick in 1953?
Cells
Which part of the cell is often called its powerhouse?
Evolution
Who proposed the theory of evolution by natural selection?
Cells
What is the basic unit of all living things?
Genetics
How many chromosomes are in a typical human body cell?
Genetics
Which scientist is known as the father of genetics for his experiments with pea plants?
Ecology
In a food chain, what do we call organisms such as plants that make their own food?
Classification
Mushrooms belong to which kingdom of life?
History
Which scientist first described cells after looking at cork through a microscope in 1665?
Cells
What is the process in which one cell divides into two identical cells?

Explanations: answer key for all 10 questions

Q1: Which molecule's double-helix structure was described by Watson and Crick in 1953?
Answer: DNA
James Watson and Francis Crick described the DNA double helix using X-ray images made by Rosalind Franklin and Maurice Wilkins. The discovery explained how genetic information is copied.
Q2: Which part of the cell is often called its powerhouse?
Answer: Mitochondria
Mitochondria turn food into ATP, the energy that cells run on. They have their own small set of DNA, which is passed down only from the mother.
Q3: Who proposed the theory of evolution by natural selection?
Answer: Charles Darwin
Charles Darwin published On the Origin of Species in 1859, after his voyage on HMS Beagle. Alfred Russel Wallace reached the same idea independently.
Q4: What is the basic unit of all living things?
Answer: Cell
Every living thing is made of one or more cells. Bacteria are single cells, while a human body contains tens of trillions of them.
Q5: How many chromosomes are in a typical human body cell?
Answer: 46
Human cells normally have 46 chromosomes in 23 pairs, one set from each parent. Egg and sperm cells carry 23 chromosomes each.
Q6: Which scientist is known as the father of genetics for his experiments with pea plants?
Answer: Gregor Mendel
Gregor Mendel, a monk in Brno, studied thousands of pea plants in the 1850s and 1860s and discovered how traits are inherited. His work was ignored until 1900.
Q7: In a food chain, what do we call organisms such as plants that make their own food?
Answer: Producers
Producers, mainly plants and algae, use sunlight to make food. Consumers eat other organisms, and decomposers such as bacteria and fungi break down dead material and return nutrients to the soil.
Q8: Mushrooms belong to which kingdom of life?
Answer: Fungi
Fungi are not plants: they cannot make their own food by photosynthesis and are more closely related to animals. Yeast and molds are fungi too.
Q9: Which scientist first described cells after looking at cork through a microscope in 1665?
Answer: Robert Hooke
Robert Hooke named cells after the small rooms, or cells, of a monastery. A few years later, Antonie van Leeuwenhoek became the first to see living bacteria.
Q10: What is the process in which one cell divides into two identical cells?
Answer: Mitosis
Mitosis produces two identical cells and is how the body grows and repairs itself. Meiosis produces egg and sperm cells with half the number of chromosomes.

Biology Quiz – The Science of Life

Biology is the study of living things, from the smallest bacteria to the largest whales. It explains how organisms grow, reproduce, find energy and change over time. Because biology covers so much ground, it is divided into fields such as genetics, ecology, cell biology, botany and zoology, all connected by a few big ideas.

The first big idea is that all life is made of cells. Robert Hooke first saw them in 1665, and today we know that even the most complex animals are built from cells that copy themselves by mitosis. Inside each cell, structures such as the nucleus and mitochondria have special jobs, much like the organs of a body.

The second big idea is heredity. Gregor Mendel's pea experiments showed that traits are passed down in predictable patterns, and the discovery of the DNA double helix in 1953 revealed how. Today scientists can read entire genomes and even edit genes using tools such as CRISPR.

The third big idea is evolution. Charles Darwin showed how natural selection allows living things to adapt to their surroundings over many generations. Evolution explains why there are millions of species, from fungi and plants to animals, and why they share so many features.

This quiz covers cells, genetics, evolution and classification, with an explanation for each answer.

Biology is also a fast-moving science. New species are described every year, often in rainforests and the deep sea, and techniques such as DNA sequencing let scientists trace how closely living things are related. Many medical advances, from vaccines to cancer treatments, come directly from research on how cells and genes work.

What This Quiz Teaches

This quiz is useful for students studying biology, nature lovers and anyone curious about how life works.

Why the cell is the basic unit of life
What mitochondria do
How DNA and chromosomes carry genetic information
What Mendel and Darwin discovered
Why fungi are not plants
The difference between mitosis and meiosis

Quick Facts About Biology

Scientists estimate there are around 8.7 million species on Earth, most still undiscovered.
Bacteria in and on the human body are about as numerous as human cells.
The largest living organism may be a honey fungus in Oregon covering about 9 square kilometers.
Tardigrades, tiny animals also called water bears, can survive extreme heat, cold and radiation.
The Human Genome Project finished mapping human DNA in 2003.
Plants produce most of the oxygen we breathe together with ocean algae.