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B2 1.1 Animal and plant
cells
Most human cells are like most other animal cells
and contain a nucleus, cytoplasm, cell membrane,
mitochondria and ribosomes.
Plant and algal cells contain all the structures seen
in animal cells as well as a cell wall. Many plant
cells also contain chloroplasts and a permanent
vacuole filled with sap.…read more

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B2 1.2 Bacteria and Yeast
A bacterial cell consists of cytoplasm and a
membrane surrounded by a cell wall. The genes
are not in a distinct nucleus.
Yeast is a single-celled organism. Each cell has a
nucleus, cytoplasm and a membrane surrounded
by a cell wall.…read more

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B2 1.3 Specialized Cells
Cells may be specialized to carry out a particular
function.
Examples of specialized cells are fat cells, cone
cells, root hair cells and sperm cells.…read more

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B2 1.4 Diffusion
Dissolved substances and gases such as oxygen
move in and out of cells by diffusion.
Diffusion is the net movement of particles from an
area where they are at a high concentration to an
area where they are at a lower concentration.
The greater the difference in concentration, the
faster the rate of diffusion.…read more

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B2 1.5 Tissues and Organs
A tissue is a group of cells with similar structure
and function.
Organs are made of tissues. One organ may contain
several types of tissue.…read more

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