Question 1
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Key Idea
Chromosomes compact long DNA molecules so they can be moved during cell division.
Natural Sciences Quiz
How the world works.
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Question 2
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Key Idea
Minerals have ordered atoms and definite compositions, unlike most rocks.
Question 3
A very dense star remnant, like a white dwarf, neutron star, or black hole
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Key Idea
Some compact objects act like cosmic clocks: spinning neutron stars called pulsars sweep radio beams past Earth with such regularity that we can detect tiny wobbles from orbiting planets.
Question 4
What stores the information needed to build and maintain an organism?
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Key Idea
DNA is like a recipe book written in four letters, and cells read small sections into RNA and then proteins, turning stored instructions into the structures and actions of life.
Question 5
Most of the normal matter in a galaxy cluster is hot gas that glows in ...
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Key Idea
Because this gas fills the whole cluster, astronomers use X-ray maps to weigh clusters and even trace hidden dark matter via how gravity shapes the hot gas distribution.
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