Introduction to cells

Biology is a branch of science that studies living organisms and life processes

respiration

excretion

movement

irritability/ sensitivity

nutrition

development/growth

Reproduction

Microscope and microscopic

cells are the basic building blocks of living things ( the basic unit of life)

a unicellular organism

plants and animals

Plant cell

animal cell

It is deferencially permeable and it is also called the plasma membrane

A small stucture in a cell than is sorrounded by a membrane and has a specific function

• forms a barrier between the cell and the environment

• controls what enters and what leaves the cell

• cell walls are fully permeable meaning it allows most substances to pass through it

• all plants have a cell wall

• the cell wall is very rigid and strong

• to support and protect the cell

• give the cell a fixed/regular shape

• to prevent the cell from bursting if it absorbs alot of water

It is a clear, jelly- like substance containing 70% water that dissolves most substances

to support the organelles and is a site of many chemical reactions

• hold chromosomes which store genetic information in the form of DNA

• controls all the cell activity

• controls how the cell develops

this is where energy is release from the food

a space in a cell sorrounded my a membane containing a solution

plant cells have large permanent vacuoles which contain sugar and other substances called cell sap

Animal cells may have small temporary vacuoles

Chlorophyll is used to absorb sunlight which is used to make food (glucose) in green plants by the process call ed photosynthesis

Clorophyll

Glycogen granules store glucose in animal cells