Question 1
Process that produces two cells from one
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Key Idea
Cell division comes in two main types: mitosis makes identical body cells for growth and repair, while meiosis makes sperm and egg cells with half the usual DNA.
Cell Biology Quiz
Cells as living systems.
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Question 2
This image question appears in the interactive quiz.
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Key Idea
The nucleus protects DNA while controlling traffic through its membrane pores.
Question 3
What is mostly a lipid double layer in water?
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Key Idea
In water, phospholipids self-assemble into a bilayer with hydrophilic heads outward and hydrophobic tails inward, creating a selective, fluid barrier where proteins drift to move signals and cargo.
Question 4
What can generate force that drives cell crawling?
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Key Idea
Cell crawling is powered by actin filaments that rapidly polymerize to push the leading edge forward, while myosin motors contract the rear and integrin adhesions provide traction.
Question 5
Apoptosis is executed by caspases that cleave many cellular proteins.
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Key Idea
Executioner caspases like caspase-3 are activated by initiator caspases and then cleave hundreds of substrates, including ICAD to free CAD and trigger DNA fragmentation.
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