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Combined Science Higher Biology (GCSE 9-1 AQA) Final Exam And Correct Answers. $10.09   Add to cart

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Combined Science Higher Biology (GCSE 9-1 AQA) Final Exam And Correct Answers.

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  • Course
  • Combined Science
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  • Combined Science

What is a cell? - Answer The basic unit of all living things What is a eukaryotic cell? - Answer A cell with a nucleus What is a prokaryotic cell? - Answer A cell without a nucleus Features of a eukaryotic cell? - Answer - Have a membrane bound nucleus - Large (10 - 100 µm) ...

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  • October 25, 2024
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Combined Science Higher Biology
(GCSE 9-1 AQA) Final Exam And Correct
Answers.
What is a cell? - Answer The basic unit of all living things



What is a eukaryotic cell? - Answer A cell with a nucleus



What is a prokaryotic cell? - Answer A cell without a nucleus



Features of a eukaryotic cell? - Answer - Have a membrane bound nucleus

- Large (10 - 100 µm)

- Multi cellular

- Complex



Features of a prokaryotic cell? - Answer - Lacks a nucleus

- Small (0.1 - 5 µm)

- Unicellular

- Simple



Example of prokaryotic cell... - Answer Bacteria



Examples of eukaryotic cells... (2) - Answer Plant and animal



What is a subcellular structure? - Answer Different parts of a cell



What is the function of the nucleus? - Answer Contains genetic info and controls the activities of the
cell

,What is the function of the mitochondria? - Answer Where aerobic respiration takes place to transfer
energy for the cell



What is the function of the cell membrane? - Answer Controls what enters and exits the cell



What is the function of the ribosomes? - Answer The site of protein synthesis



What is the function of the cytoplasm? - Answer Site of chemical reactions, it contains enzymes to
control these reactions



What are the features of an animal cell? (5) - Answer Nucleus, cytoplasm, cell membrane,
mitochondria, ribosomes



What is the function of the cell wall? - Answer Supports and strengthens the cell



What is the cell wall made of? - Answer Cellulose



What is the function of the permanent vacuole? - Answer Contains cell sap, a weak solution of sugar
and salts, to keep cell turgid



What does 'turgid' mean? - Answer Enlarged and swollen with water



What is the function of the chloroplasts? - Answer Contain chlorophyll, which absorbs light energy for
photosynthesis



What are the differences between plant and animal cells? (3) - Answer Plant cells have:

- Cell wall

- Permanent Vacuole

- Chloroplasts

,What contains the DNA in a bacterial cell? - Answer - Plasmids (small rings of DNA)

- Loop of DNA



What are the features of a bacterial cell? - Answer Cell membrane, cell wall, cytoplasm, loop of DNA,
plasmids



What are light microscopes? - Answer Microscopes that use light and lenses to form an image of a
specimen and magnify it



What are electron microscopes? - Answer Microscopes that use beams of electrons to form an image
of the specimen and magnify it



What is magnification? - Answer How much bigger an image is than a specimen



What is resolution - Answer The ability to distinguish between two separate points in an image



Benefits of electron microscopes... - Answer - Better resolution

- Better magnification



Benefits of light microscopes... - Answer - Cheap

- Portable

- Can examine living specimens

- Colour image



What is the formula for magnification? - Answer Magnification = image size ÷ real size



How do you prepare a slide (magnification) ? - Answer 1. Add a drop of water to the middle of a clean
slide

2. Cut open specimen and separate into thin layers, using tweezers to do so

, 3. Using tweezers, place specimen into the water on the slide

4. Add a drop of iodine solution to highlight objects in a cell

5. Place cover slip on top, ensuring that no air bubbles are trapped



How do you use a light microscope to look at your slide? - Answer 1. Clip the slide onto the stage

2. Select lowest powered objective lens

3. Use the coarse adjustment knob to move stage up and down

4. Look through eyepiece. Use coarse adjustment knob to move stage downwards until image is roughly
in focus

5. Adjust the focus with the fine adjustment knob until you get a clear image

6. If you need better magnification, swap to a higher-powered objective lens



What is differentiation? - Answer the process by which cells become specialised



Why is differentiation important? - Answer Because it allows cells to carry out particular functions that
are vital for the survival of the organism



Why is differentiation important? - Answer It allows cells to carry out particular functions that are vital
for the survival of the organism



What are stem cells? - Answer Undifferentiated cells



What is the function of a sperm cell? - Answer To transport the male's DNA to the female's egg



How are sperm cells specialised for reproduction? - Answer - Long tail and streamlined head to help it
to swim to the egg

- Lots of mitochondria in the cell to provide the energy for swimming

- Enzymes in the head to digest through the egg cell membrane

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