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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BIOLOGY · 8 EXPLORATION STEPS
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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- 01
Osmosis
- 02
Protoplasmic layer
- 03
Water loss
- 04
Where does the water go?
- 05
Deplasmolysis
- 06
Glycerol
- 07
Estimate concentration
- 08
Assessment
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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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