Question

I need to do 90 Questions for science and I need help with some of them. I need them by tomorrow. Thanks

- Cell Biology
List the parts found in an animal cell.
List the parts found in an plant cell.
List the function of all 8 organelles.
Write down three parts found in both plant and animal cells.
Describe two differences between prokaryotic and eukaryotic cells.
Describe how the following specialised animal cells are adapted to their function: muscle cell, nerve cell and sperm cell.
Describe how the following specialised plant cells are adapted to their function: xylem, phloem and root hair cell.

- Cell differentiation
What is meant by cell differentiation?
What is the function of mitosis?
Describe the different stages of mitosis.
What is a stem cell?
Explain the difference between embryonic and adult stem cells, including the advantages and disadvantages of each.
Describe what is meant by therapeutic cloning
Describe where stem cells are found in plants.
Give two uses of stem cells in plants.

- Microscopes
Define the terms magnification and resolution.
Explain the benefits of using an electron microscope.
What part of the microscope would you use to make an image bigger?
What part of the microscope would you use to make an image clearer?
What two parts of the microscope do you use to calculate magnification?
Two prokaryotic cells were measured. Cell 1 measured 0.0004mm and Cell 2 measured 40000μm. Convert both of these measurements to standard form.
Recall the formula to calculate magnification.
A cell measures 112mm. The actual size is 280μm. Calculate the magnification.
Recall the formula to calculate actual size.
A cell is magnified x3000 and measures 6mm. Calculate the actual size in mm.
A cell is magnified x3000 and measures 6mm. Calculate the actual size in μm.

- Diffusion
Recall the definition of diffusion.
Draw a diagram showing oxygen diffusing into a cell. Label the high and low concentrations.
Describe what is meant by concentration gradient.
Describe how concentration gradient, temperature and surface area affect the rate of diffusion.
Explain, in terms of surface area: volume, why single celled organisms have no need of a transport system.
Calculate the surface area and volume for a 1mm cube, 2mm cube and 4mm cube.
Calculate the surface area to volume ratio for the 1mm, 2mm and 4mm cube.
Explain four ways that exchange surfaces of alveoli are adapted to exchange materials with blood.

- Osmosis
What is osmosis?
A carrot was placed in a dilute solution. What will happen to its mass? Explain your answer.
The carrot was placed in 0.4 mol/dm 3 solution. Its mass did not change. Explain why this happened.
What does this tell us about the concentration of the carrot?
The carrot was placed in a concentrated solution. What will happen to its mass? Explain your answer.
What is the formula to calculate percentage change in mass?
Why is percentage change used instead of change in mass?

- Active transport
What is active transport?
Describe how root hair cells use active transport.
Explain why cells performing active transport require lots of energy.

- Digestion
Define the terms cell, tissue, organ and organ system.
Label and describe the function of the following: mouth, salivary glands, stomach, liver, gall bladder, pancreas, small intestine, large intestine.
How does bile aid the digestion of fats?
Recall the method for testing a substance for the presence of starch. Identify the + and – results.
Recall the method for testing a substance for the presence of protein. Identify the + and – results.
Recall the method for testing a substance for the presence of glucose. Identify the + and – results.
Recall the method for testing a substance for the presence of lipids. Identify the + and – results.
Explain three ways villi are adapted to increase absorption in the small intestine.
Identify the independent, dependent and control variables for the practical investigating amylase.


- Enzymes
Use a diagram to demonstrate the lock and key theory. Label the substrate, enzyme and active site.
What is the definition of an enzyme? What are enzymes made of?
Use a diagram to demonstrate what happens when an enzyme becomes denatured.
Recall two factors which can denature an enzyme.
Explain how temperature affects the rate of reaction, linking it to the collision theory.
Recall the function of digestive enzymes.
Describe the function of lipase, amylase and protease. Include their site of production and preferred conditions.
Recall the method for investigating the effect of pH on the enzyme amylase.
Be able to explain the results of the amylase practical.

Answer 1

Answer:

With an increase in temperature, there is an increase in the number of collisions. Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate.

Explanation:

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