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