CHAP 1 CELLS

Question 1

define ‘cells’

Answer 1

• simplest structural & functional units of life

Question 2

what role does mitochondria play in cells?

Answer 2

• provides energy for cell activities

Question 3

what role does CHLOROPLASTS play in cells?

Answer 3

• carry out photosynthesis

Question 4

what are the difference between light microscopes and electron microscopes?

Answer 4

LIGHT microscopes
• magnify objects up to 1000x
• coloured images
ELECTRON microscopes
• magnify objects to more than 200 000x
• black & white images , can be artificially colourised

Question 5

cells consists of a mass living matter called ‘protoplasm’
what is protoplasm?

Answer 5

• jelly-like substance
• chemical activities which allows cell to survive & grow are carried out in the protoplasm
• CONSISTS OF (CCVN)
- cell membrane
- cytoplasm
- vacuole
- nucleus

Question 6

what is cell membrane made up of?

Answer 6

lipids & proteins

Question 7

what is cell wall made up of?

Answer 7

cellulose

Question 8

what is 1 function of cell membrane?

Answer 8

• controls the movement of substances in & out of the cell ( partially permeable )

Question 9

what are 4 functions of the cell wall?

Answer 9

• protects the cell from injury
• gives plant cell fixed shape
• fully permeable ( does not control type of substance that enters the cell )
• absent in animal cells

Question 10

what role does ribosomes play in a cell?

Answer 10

• involved in the process of protein synthesis ( making proteins )