b1.1

Question 1

Eukaryotic cell

Answer 1

Has a nucleus

Question 2

Prokaryotic cell

Answer 2

Does not have a nucleus - the genetic material floats in cytoplasm

Question 3

Cell walls are made of

Answer 3

Cellulose

Question 4

Feautures of eukaryotic cell

Answer 4

Nucleus, cutoplasm, cell membrane, mitochondria

Question 5

Nucleus

Answer 5

1) controls activity of the cell
2) contains genetic material arranged as chromosomes
3) determines the cells appearance and function
4) contains instructioms to make new cells/ organisms

Question 6

Cell membrane

Answer 6

1) selective barrier that comtrols what passes into and out of cell

Question 7

Mitochondria

Answer 7

1) where respiration happens
2) enzymes enable glucose and oxygen to react to make energy
3) the energy is vital to the cell to survive

Question 8

Cytoplasm

Answer 8

1) jellylike

2) all the chemical reactions of cell happen here

Question 9

Cell wall

Answer 9

1) made from cellulose

2) keep cell rigid

Question 10

Bacteria

Answer 10

1) smallest living organisms
2) unicellular
3) contain cell membrane, cell wall, genetic material

Question 11

Extras

Answer 11

Pili, flagella, plasmids, slime capsule

Question 12

Flagella

Answer 12

Enables bacteria cell to move through liquids

Question 13

Pili

Answer 13

Enable cell to attach to structures, also used to transfer genetic material between bacteria

Question 14

Slime capsule

Answer 14

Protects bacteria cell from drying out and from poisonous substances
Helps to stick to smooth surfaces

Question 15

Plasmid

Answer 15

Circular
Used to store edtra genes
May help in times of stress

Question 16

Describe how to observe cells through a microscope

Answer 16

Move to lowest position
Select lowest objective lens magnification
Place slide on stage
Raise to highest position
Lower stage w coarse focus until u see substance
Turn fine focus until substance is clear
To see more detail switch to a higher objective lens

Question 17

Magnification formula

Answer 17

Eyepiece lens magnification x objective lens magnification

Question 18

Iodine

Answer 18

Plant cells nuclei

Question 19

Methylene blue

Answer 19

Animal cells nuclei

Question 20

Crystal violet

Answer 20

Bacteria cell walls

Question 21

Why stain

Answer 21

See substance more clearly, otherwise cell is colourless

Question 22

Resolution

Answer 22

Smallest distance between two points that can be seen as separate entities

Question 23

Describe a tem microscope

Answer 23

Transmission electron microscope
Most magnified images
Beam of electrons pass through thin sample
Beam = focused to make an image

Question 24

Describe a sem microscope

Answer 24

Scanning electron microscope
Make 3d image
Beam of electrons go across the surface if sample
The reflected electrons are collected to make an image

Question 25

Light microscopes are..

Answer 25

Cheap 
Easy to operate 
Simple to prepare sample
Portable
Natural colour is present if no stain
Specimens can be living or dead

Question 26

Electron microscopes are..

Answer 26

Expensive
Large and difficult to move
Sample prep is hard
Black and white, but can be coloured falsely 
Specimens are dead