pre test: cells (1)
Q - what is the function of the nucleus ?
A - controls acivities of the cell.
Q - which structure controls the movement into and out of the cell?
A - the cell membrane.
Q - where do most chemical reactions take place in a cell?
A - The cytoplasm
Q - what is the function of ribosomes ?
A - to produce protiens
pre test: cells (2)
Q - which structures are necassary for aerobic resperation to take place ?
A - Mitochondria
Q - which structures are nessasry for photosynthesis to take place?
A - chloroplasts
Q - why are some plant and animal cells specialised?
A - There are many different functions that plants and animals need to carry out.
Q - How can diffusion be defined ?
A - The random movement of particles from a high concentration to a low one.
Pre test: cells ( 3)
Q - what substances might diffuse into or out of cells?
A - Oxygen, carbon dioxide, glucose.
Q - How is osmosis different to diffusion?
A - takes place through the a partially permable membrane and only involves the movement of water
Animal and plant cells
Q - Name three structures common in both plant and animal cells?
A - Cell membrane, nucleus, cytoplasm.
Q - Where does aerobic resperation take place?
A - Mitochondria
Q - Name to materials that move across the cell membrane
A - Carbon dioxide and oxygen.
Q - Give to examples of specialised animal cells?
A - Egg cells and mucsel cells.
Q - How is the structure of a nerve cell related to it's function.
A - It is long and has many nerve endings to communicate with.
Q - What do we call the process that results in some cells becomeing specialised?
A - differentiation
How do substances get in and out of cells?
Q - Why do particles move randomly?
A - They naturally vibrate as they have energy.
Q - Give an example of diffusion in living cells ?
A - Glucose into a respiring cell?
Q - Why is diffusion important ?
A - Cells need a constant supply of materials,and to get rid of waste materials.
Q - How is osmosis like diffusion?
A - I involves the random movement of particles.
Q - What does partially permeable mean?
A - A membrane that only allows small molecules through
Q - why do cells need water?
A - For support and chemical reactions take place in water.
End of chapter: cells (1)
Q - What is the function of ribosomes?
A - To synthesise (make protiens)
Q - Suggest how a sperm cell is adapted to it's function?
A - It is streamlined for swimming and has lots of mitochondria to produce energy
Q - why does diffusion require no energy form the cell?
A - Particals naturaly vibrate.
Q - Why would it be wrong to say that in osmosis water only passes from the weaker solution to the stronger solution.
A - It also passes from the stronger to the weaker because the movement of particals is random
End of chapter questions: cells (2)
Q - What substance, necessary for photosynthesis, do chloroplasts contain?
A - Chlorophyll
Q - What is the functio of the cell wall in plants?
A - For support
Q - Why does oxygen in the blood diffuse into respiring cells?
A - It is a higher concentration in the blood than in the cells.