B1.1 Cells

Question 1

2 types of cells

Answer 1

Eukaryotic - contains nucleus

Prokaryotic - no nucleus

Question 2

MRS GREN

Answer 2

Movement
Respiration
Sensitivity
Growth
Reproduction
Excretion
Nutrition

Question 3

Cell membrane

Answer 3

Selective barrier

Contains receptor molecules

Question 4

Vacuole

Answer 4

Cell sap that keeps cell upright and firm

Question 5

Pili

Answer 5

Enables cell to attach to places

Used to transfer genetic material between bacteria

Question 6

Slime capsule

Answer 6

Protects cell from dying out
Protects from poisonous substances
Allows to attach to smooth surfaces

Question 7

Plasmid

Answer 7

Extra genes for stuff like antibiotics resistance

Question 8

Resolution

Answer 8

Smalles distance between 2 points that can be seen as 2 different entities

Question 9

Resolution of light microscope

Answer 9

2x10^-7

Question 10

Stains

Answer 10

Methylene Blue - Nucleus of animal cell
Iodine - plant cell nucleus
Crystal violet - bacterial cell wall

Question 11

How does light microscope work

Answer 11

Light passes through slide into objective lens then eyepiece lens

Question 12

How to use light microscope

Answer 12

Stage
Objective lens
Slide
Coarse focus
Fine focus

Question 13

How does a TEM work

Answer 13

Beam of electrons pass through sample and is focused to produce image

Question 14

How does an SEM work

Answer 14

Beam of electrons scan across sample and the reflected electrons produce a 3D image

Question 15

Light Microscope Pros and Cons

Answer 15

Cheap
Portable
Simple to use
Natural colour
Living or dead samples
Relatively low resolution

Question 16

Electron Microscope Pros and Cons

Answer 16

Expensive
Large
Complicated
Fake colour used
Only dead samples
Very good resolution

Question 17

Resolution of a TEM

Answer 17

1x10^-10