Biology - Chapters 1 and 2

What is a cell?

The basic unit of life
What is a unicellular organism?

A unicellular organism consists of one cell which possesses a variety of structures enabling it to perform all the functions necessary for the maintenance of life
What is a multicellular organism?

A multicellular organism consists of more than one cell. In advanced animals and plants these are arranged into tissues giving a division of labour
Variation in a cell structure exists between cells of one type of tissue and cells of different tissues since cells are _______ to perform particular functions?

specialised
Name three ways cells absorb molecules in solution

Osmosis, diffusion and active transport
What is the cell wall in plants made of?

Cellulose
The cell wall is ______ _______ to solutions?

freely permeable
What prevents the cell from bursting when water is absorbed?

The cell wall
The plasma membrane is _______ permeable?

selectively
What does the plasma membrane consist of?

protein and phospholipid molecules
How are the molecules in the plasma membrane arranged?

In the fluid mosaic model
What makes the plasma membrane porus?

Tiny channels
What kind of molecules are actively transported across the plasma membrane?

Ions
Does active transport require energy?

YES!

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Card Set

Biology - Chapters 1 and 2

Description

Higher Biology - Unit one

Updated

2011-09-01T18:00:32Z

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