Water uptake and loss in plant cells
Vegetable leaves become firmer and crisper in clean water, but release water when salted. How do plant cells gain and lose water?
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BIOLOGY · 8 EXPLORATION STEPS
Factors affecting enzyme activity
Why does boiling water destroy an enzyme's activity, while its activity can return after it is removed from ice water?
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▶ Open 3D simulationYOUR EXPLORATION
One step, one new insight.
- 01
Explore the laboratory bench
- 02
Temperature
- 03
pH
- 04
High temperature: irreversible
- 05
Low temperature: reversible
- 06
Look inside
- 07
Extreme acidity or alkalinity
- 08
Assessment: act as a technician
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Transport across cell membranes
Across the same cell membrane, why can oxygen pass unaided, glucose needs a transport protein, and K⁺ can still move against its concentration gradient?
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Generation and conduction of nerve impulses
Starting within 0.1 s of the gun is classified as a false start (original textbook, p.27). How is an excitation signal transmitted through the body?
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