ExpertBiology
Expert Biology Quiz: CRISPR, Epigenetics and Endosymbiosis
Expert biology quiz on gene regulation without DNA change, the CRISPR-Cas9 system, the origin of mitochondria, chromosome ends and programmed cell death.
Biology quizzes
Cells, evolution, human body
The Biology theme studies living things, from the cell to whole ecosystems. It covers cell structure, DNA and genes, cell division, Darwin's theory of evolution, the classification of species, Mendel's genetics and how the human body works: skeleton, muscles, heart, brain, immune system and digestion.
You will also meet microbes, viruses, bacteria and landmark discoveries such as Pasteur's vaccines. All the biology quizzes are available free of charge; they span five difficulty levels up to expert, and explain every answer.
Quizzes
HardBiology
Hard Biology Quiz: DNA Replication, Gametes and Selection
A hard biology quiz on gamete production, the enzyme unwinding DNA, the 1953 double helix, extreme-trait selection and chlorophyll in plants. 10 questions.
MediumBiology
Biology Quiz: Cell Energy, Hormones and Immunity (Intermediate)
Intermediate biology quiz: how cells make energy from glucose, the vertebrate skeleton, sexual reproduction, the thyroid and antibody-making immune cells.
EasyBiology
Biology Quiz: DNA, Cells and Blood Types (Easy)
Easy biology quiz: the molecule of genetic information, cells without a nucleus, the cell's powerhouse, universal blood donors and cell division.
Very easyBiology
Biology Quiz: Organs, Spiders and Amphibians (Very Easy)
A very easy biology quiz: which organ lets us breathe, a spider's legs, the largest mammal, the organ we think with and frogs. 10 free questions.
Related themes
Frequently asked questions about Biology
What is DNA and what does it do?
DNA is a long double-helix molecule found in almost every cell, and it carries genetic information. Its sequence of four bases (A, T, C and G) holds the instructions for making proteins. The double-helix structure was described in 1953 by Watson and Crick.
Who proposed the theory of evolution by natural selection?
Charles Darwin set it out in 1859 in On the Origin of Species, after his voyage aboard the Beagle. Naturalist Alfred Russel Wallace had independently reached a similar idea. According to the theory, individuals best suited to their environment tend to leave more offspring.
How many bones are in the adult human body?
An adult skeleton has 206 bones. Babies have more, because several bones, such as those of the skull or pelvis, start as separate pieces that fuse during growth. The longest bone is the femur in the thigh, and the smallest is the stapes in the middle ear.