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
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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- 01
Simple diffusion
- 02
Selective permeability
- 03
Facilitated diffusion
- 04
Carrier proteins and channel proteins
- 05
Active transport
- 06
Endocytosis and exocytosis
- 07
Synthesis
- 08
Quiz
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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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Observing mitosis in root-tip meristematic tissue
Which cells in an onion root tip are dividing? Can counting cells estimate the duration of each phase?
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