Biology

23問 • 2年前

問題一覧

What is the differnt between a microscope and electronic microscope?

Light microscopes have a lower resolution 0.2μm or 200nm compared to less than 0.001μm or 1nm on an electron microscope and a lower magnification 500x to 1500x compared 2000000x

What is the formula for magnification

Magnification = image size / real size

What do animal cells contain?

Nucleus, cytoplasm, cell membrane, mitochondria, ribosomes

What do plant cells contain?

cell wall, vacuole, chloroplasts, nucleus, cell membrane

What is the function of the vacuole?

Contains cell sap and dissolved food

What is the function of the cytoplasm?

Where chemical reactions take place

What is the function of the cell membrane?

Allows things in and out of the cell

What do both prokaryotic and eukaryotic cells have?

plasma membrane, DNA chromosomes, ribosomes, cytosol /cytoplasm

What are the properties of Eukaryotic cells and Prokarytic cells?

Most are 5 μm - 100µm Cell membrane - - surrounded by cells wall in plants and fungi

What is the function and specialisation of nerve cells?

Nerves cells carry messages down rge nervous system

They are thin and long, allowing them to carry nessages quickly

They have a branched end, so they can pass messages around the body They have fatty (myelin) sheath, to increase the speed that it travels

What is the function and adaptations of a red blood cell?

They contain haemoglobin to carry oxygen molecules No nucleus, to allow space Flat disk shapes, giving them a lage surface area

What is the function and some examples of muscle cells?

Cardic: These relax abd contract to pump blood around the body Smooth

What is the function root hair cells?

Root hair cells obsorb water minerals in soil

What is the function and adaptations of palisade cells?

They are found at the top of trees for maximum light They have lots of chloroplasts

What is the function and adaptation of Xylem cells?

They transport water form the roots to other parts of the plant They die and their ends break down

What is the function and adaptation of plant pholem cells?

They transport sugary water from the leaves to the rest of the plant They are found near the top and are alive They have companion cells, where respiration occurs, releasing energy from glucose to transport other substances in the xylem

What factors affect the rate of diffusion?

The higher the temperature, the more kinetic energy the particles will have, so they will move and mix more quickly surface area: If it increases, the same volume of substance has a greater area to diffuse across difference in concentration: This would incorrage diffusion to happen a lot faster

What is osmosis?

diffusion of water across a selectively permeable membrane

What's the difference between osmosis and diffusion?

In osmosis fluid moves, whereas in diffusion, solutes move

What happens if a plant loses too much water?

They droop and become soft

What is maintaining constant internal conditions important?

It is important for the wellbeing of plants

Write a plan to investigate the effect of tissue in salt of sugary solutions

Prepare a range of sugar solutions Set up a series of boiling tubes and put a different concentration of suger in each solution Prepare a few equally sized potato cubes, recording the mass before the experiment and after a few minutes in the solutions Then use the forumla % change in Mass = final mass/ initial mass to find the effect

Crime and punishment

Ben Stone · 26問 · 2年前

Crime and punishment