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Creating the content you enjoy every day takes constant work, research, and dedication.
Our team of collaborators puts in countless hours, all without any compensation, to keep these channels active, useful, and inspiring.
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Which organ produces red blood cells in adults?
Anonymous Quiz
17%
Liver
12%
Thymus
65%
Red bone marrow
6%
Spleen
❤4
What are planetary rings composed of?
Anonymous Quiz
15%
An asteroid belt around Saturn
70%
Discs of ice and dust orbiting a planet
12%
A nebula around a star
4%
A system of close moons
❤1
What is DNA transcription?
Anonymous Quiz
21%
DNA duplication before mitosis
60%
Synthesis of RNA from the DNA template
13%
Protein synthesis from mRNA
6%
Repair of damaged DNA strands
❤2
Which law describes the gravitational force between two masses?
Anonymous Quiz
13%
Coulomb's law
5%
Hooke's law
78%
Newton's law of universal gravitation
3%
Gauss's law
❤1
Which ear structure converts sound vibrations into nerve signals?
Anonymous Quiz
21%
Eardrum
52%
Hammer, anvil and stirrup
24%
Cochlea
3%
Semicircular canals
❤1
What does Mendel's law of segregation state?
Anonymous Quiz
8%
Traits blend across generations
77%
During gamete formation, the two alleles of each gene separate into distinct gametes
11%
Genes are inherited together if close on a chromosome
4%
Mutations are transmitted only maternally
❤1
Which phenomenon explains the expansion of the universe?
Anonymous Quiz
9%
Centrifugal force of galactic rotation
72%
Cosmological redshift and Hubble's law
15%
Gravitational field of black holes
4%
Nuclear reactions in stars
What is a neutralisation reaction?
Anonymous Quiz
1%
An acid dissolving a metal
92%
The reaction between an acid and a base producing salt and water
7%
Decomposition of a salt into ions
0%
A heat-absorbing reaction
Which type of radiation is stopped by a sheet of paper?
Anonymous Quiz
15%
Gamma rays
24%
Beta rays
36%
Alpha rays
25%
X-rays
What does ethology study?
Anonymous Quiz
54%
Chemical composition of organisms
30%
Animal behaviour
8%
Mineral structure
8%
Genetic diseases
Which macromolecule is the primary long-term energy store in animals?
Anonymous Quiz
28%
Glycogen
16%
Starch
51%
Lipids (triglycerides)
6%
Proteins
👍1
Which proteins are responsible for muscle contraction?
Anonymous Quiz
34%
Actin and myosin
25%
Collagen and elastin
33%
Haemoglobin and myoglobin
7%
Keratin and fibrin
❤1