Question 1
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Key Idea
Bacteria are single cells with their own metabolism and machinery for growth.
Biology Quiz
Life, from cells to ecosystems.
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Question 2
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Key Idea
Antibodies recognize specific molecular shapes with paired binding arms.
Question 3
What is the process by which a cell becomes a specific type like a nerve cell or a muscle cell?
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Key Idea
During differentiation, most cells keep the same DNA but switch different genes on or off, guided by chemical signals, so one cell can become a neuron while another becomes muscle.
Question 4
What can change with environment even when the genotype stays the same?
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Key Idea
Same genotype, different environment can flip gene activity via epigenetic tags, like Himalayan rabbits growing dark fur only on cooler body parts, because temperature affects pigment production.
Question 5
What can shrink quickly when deaths rise above births for several years?
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Key Idea
When deaths exceed births for long, a population can enter an "extinction vortex" where shrinking numbers reduce mating success and genetic diversity, making the decline accelerate.
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