RP microscopes

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  • Created by: Sienna...
  • Created on: 17-03-22 11:49
Describe how a sperm cell is adapted to its role.

[4 marks]
.role is to fertilise an egg
.the head has the nucleus, which contains the male genetic material
.it has a tail for swimming
.the acrosome has enzymes so that the sperm can penetrate the egg
.it is packed with mitochondria to supply the energy for movemen
1 of 8
Describe the process of cloning and how it can help to prevent plant species from becoming extinct.

[4 marks]
.cells removed from the meristem of plant (that is being protected from extinction)
.culture the cells in sterile cell/tissue culture medium
.plantlets produced are transferred to pots
.more individuals of the plant species are produced without the plants
2 of 8
Describe the similarities and differences between the processes of diffusion and osmosis.

[4 marks]
.all gases and liquids move by diffusion
.only water moves by osmosis
.molecules move from high to low concentration in both processes
.this means molecules move down a concentration gradient
.osmosis must occur across a partially permeable membrane
.neit
3 of 8
A student observed a cell with a microscope. The magnification of the eyepiece was x10. The magnification of the objective was x20.

What magnification was the student using?

[1 mark]
x200
4 of 8
The student measured a cell they were looking at as 0.5 mm.

Convert this into micrometres
500 μm

(1 millimetre = 1000 μm)
5 of 8
A student is investigating the process of mitosis with a microscope.
The hazard warning label on the chromosome stain they use states:
.may cause skin irritation
.may cause eye irritation
.may be harmful if swallowed
.non-flammable
Suggest three safety pr
they should avoid contact with hands/skin and they could also wear gloves
they should wear safety googles
they should wash their hands after handling the bottle or slide, or not drink the stain
6 of 8
Explain why a plant will wilt if not watered. [6 marks]
.water enters plant via osmosis
.well-watered plant are turgid
.when plants arent watered they lose water which diffuses around the cell
.water concentration lower around the cell
.cell becomes plasmolysed
.cell will become flaccid
7 of 8
Describe the process of therapeutic cloning. [6 marks
.a body cell is removed from a patient and an egg cell is taken from a donor
.the nucleus is removed from the (donor) egg cell and discarded
.the nucleus is taken from the patient’s cell
.the nucleus is transferred to the donor cell
.the resulting embryo
8 of 8

Other cards in this set

Card 2

Front

Describe the process of cloning and how it can help to prevent plant species from becoming extinct.

[4 marks]

Back

.cells removed from the meristem of plant (that is being protected from extinction)
.culture the cells in sterile cell/tissue culture medium
.plantlets produced are transferred to pots
.more individuals of the plant species are produced without the plants

Card 3

Front

Describe the similarities and differences between the processes of diffusion and osmosis.

[4 marks]

Back

Preview of the front of card 3

Card 4

Front

A student observed a cell with a microscope. The magnification of the eyepiece was x10. The magnification of the objective was x20.

What magnification was the student using?

[1 mark]

Back

Preview of the front of card 4

Card 5

Front

The student measured a cell they were looking at as 0.5 mm.

Convert this into micrometres

Back

Preview of the front of card 5
View more cards

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