§-Module

Unit 2: Cells and Multicellular Organisms

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How does the cell membrane control what enters and leaves a cell?

Describe the structure of the cell membrane and explain the mechanisms of membrane transport.

The fluid mosaic model of the membrane and the mechanisms of diffusion, osmosis, facilitated diffusion, active transport, and bulk transport, for TCE Biology Unit 2.

8 min answer →

How does the structure of each organelle suit its function?

Identify the main organelles of eukaryotic cells and relate their structure to function.

The structure and function of the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi, ribosomes, and other organelles, and how compartments organise the cell, for TCE Biology Unit 2.

8 min answer →

How do enzymes control the chemical reactions of life?

Explain how enzymes work as biological catalysts and how their activity is affected by conditions.

How enzymes lower activation energy, the lock-and-key and induced-fit models, and the effects of temperature, pH, concentration, and inhibitors on enzyme activity, for TCE Biology Unit 2.

8 min answer →

Why are cells small and why do large organisms have many cells?

Explain how the surface area to volume ratio limits cell size and exchange.

How surface area to volume ratio limits cell size, controls exchange rates, and explains adaptations that increase exchange surfaces, for TCE Biology Unit 2.

7 min answer →