What three features do you find in plant cells that are not in animal cells?
Plant cells have rigid cell walls, permanent vacuoles and chloroplasts
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Cells are the building blocks of every organism on Earth. In this video we find out about the huge range and different types of plant and animal cells and various specialised cells.
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Watch this video and use it to answer the questions
1. What does a microscope do?
2. What is meant by the term resolution?
3. Which objective lens should you use first?
4. How do you work out the total magnification used ?
5. What is the magnification formula
6. In the video they show an image of a red blood cell which is 1.0cm in diameter. The actual "real" blood cell has a diameter of 0.001 cm . What is the magnification used in this example?
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In both plant and animal cells and contain the genetic material that controls the activities of the cell.
Chemical mixture (gel-like) liquid which fills the cell. It is composed of water, salts, and various organic molecules and is where most of the cell reactions take place.
Separates the inside of the cell from the outside environment. It hold the cell together, containing the cytoplasm and controls what enters or leaves the cell
These are where most of the reactions for aerobic respiration happen. This releases energy which is needed by the cell.
Where proteins are made in the cell.
Contains - a weak solutions of sugar and salts - cell sap
This gives the cell strength and supports it . It is made of cellulose
Where photosynthesis occurs. This process makes glucose . The chloroplasts contain the green pigment called chlorophyll. Found in most plants.
1. What are stem cells ?
2. what can stem cells turn into?
3. What is the difference between adult and embryonic stem cells?
4. What can stem cells be useful for?
5. Why is the use of stem cells controversial?
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Oxygen moves from the inside of the alveolus into the blood and attaches to the haemoglobin of the red blood cells. It moves by a process called diffusion.
Carbon dioxide, made during respiration, leaves the blood plasma and enters the air inside the alveolus ready to be exhaled.
The alveolus has some special features that enable gas exchange to occur more easily:
The partly digested food exits the stomach and enters the small intestine. In the first part of the small intestine bile, from the gall bladder, and pancreatic juices , from the pancreas, are added.
Both the bile and pancreatic juices help to neutralise the acid from the stomach providing the optimum pH conditions (approximately pH6 to pH8) for the enzymes to work.
Bile also emulsifies any fats present in the part digested food.
This provides a greater surface area for the digestive enzymes to work on. The pancreatic juices contain enzymes to digest carbohydrates, fats and proteins.
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