science 2

Created by: Rosa Hay
Created on: 28-04-14 09:45

Bacterial cells

A bacterium is a single-celled organism. ...... has a different structure to an animal or plant cell. It has cytoplasm, a membrane and a surrounding cell wall, but the genetic material in a bacterial cell is not in a distinct nucleus.

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Yeast

.... is a single-celled organism. Like bacterial cells, yeast cells have cytoplasm and a membrane surrounded by a cell wall. But unlike bacterial cells, yeast cells have a nucleus.

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Red blood cells

Contains haemoglobin to carry oxygen to the cells.

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What is diffusion?

Dissolved substances have to pass through the cell membrane to get into or out of a cell. ...... is one of the processes that allows this to happen.

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What are proteins made from?

long chains of smaller molecules called amino acids. These long chains are folded into particular shapes. This is important in relation to how antibodies and enzymes work.

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Polymers

Proteins are polymers. They are built up in cells when monomers called amino acids join together end to end:

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What is a polymer?

A large molecule formed from many different identical smaller molecules

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Denaturing

Enzymes can be denatured by high temperatures or extremes of pH. Note that it is wrong to say the enzyme has been killed. Although enzymes are made by living things, they are proteins and not alive.

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Activity of enzymes

The activity of enzymes is affected by temperature and pH

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Amylase

...... catalyses the breakdown of starch into sugars in the mouth and small intestine

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Other cards in this set

Card 2

Front

Yeast

Back

.... is a single-celled organism. Like bacterial cells, yeast cells have cytoplasm and a membrane surrounded by a cell wall. But unlike bacterial cells, yeast cells have a nucleus.

Card 3

Front

Red blood cells

Back

Card 4

Front

What is diffusion?

Back

Card 5

Front

What are proteins made from?

Back

View more cards

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science 2