Additional Biology Questions

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  • Created on: 01-06-12 13:49
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Moonisah Mirza
Additional Biology Questions:
1. Draw an animal and plant cell.
2. What are the differences between them?
Plant cells are larger than animal cells.
Plant cells have chloroplasts.
Plant cells have a cell wall.
3. What is the job of the ribosomes?
Ribosomes are used for protein synthesis; this means the ribosome's produce protein.
4. What is the job of the mitochondria, cytoplasm, nucleus and cell membrane?
Mitochondria ­ most energy is released in respiration here
Cytoplasm-most chemical processes take place here, controlled by enzymes
Nucleus- controls all the activities that take place inside the cell.
Cell membrane- controls the movement of substances in and out of the cell.
5. Why are cells specialised?
Cells are specialised to carry out a particular function. Their structure will allow them to carry
this function out. For example a fat cell;
Little cytoplasm-leaves more room for fat.
Little mitochondria-it uses very little energy.
They EXPAND- up to 1000 times their original size.
6. What is diffusion?
Diffusion is the movement of particles from an area of high concentration to an area of low
concentration.
7. What is osmosis?
Osmosis is the movement of water through a partially-permeable membrane from a high
concentration to a low concentration.
8. What does partially permeable membrane mean?

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Moonisah Mirza
Partially permeable membranes let some substances pass through them, but not others. We
say it is selective.
9. What is the equation for photosynthesis?
10. What happens during photosynthesis?
Photosynthesis is the chemical change which happens in the leaves of green plants. It is the
first step towards making food - not just for plants but ultimately every animal on the planet.
During this reaction, carbon dioxide and water are converted into glucose and oxygen.…read more

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Moonisah Mirza
trophic level. Most of the biomass that animals eat is either not digested, or used to provide
the energy needed for staying alive.
19. What is the difference between a pyramid of biomass and a pyramid of numbers?
Biomass shows us the total dry weight of the organisms in the trophic level.
A pyramid of numbers shows us the energy flow in an environment;
Producers will always have the most energy followed by first degree
Consumers (herbivores) and then secondary consumers (Carnivores)
20.…read more

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Moonisah Mirza
Changes in pH alter an enzyme's shape. Different enzymes work best at different pH values.
The optimum pH for an enzyme depends on where it normally works.
29. What is aerobic respiration?
Aerobic respiration needs oxygen to work. Most of the chemical reactions involved in the
process happen in tiny objects inside the cell cytoplasm, called mitochondria. This is the
equation for aerobic respiration:
Glucose + oxygen carbon dioxide + water (+ energy)
30.…read more

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Some patients who were in a diabetic coma even recovered. The extract contained the
hormone insulin.
36. What are the waste products the body removes?
Waste products must be removed from the body. If they are not, they will increase in
concentration and may interfere with chemical reactions or damage cells. Waste products
that must be removed include carbon dioxide and urea.…read more

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Moonisah Mirza
offspring had red flowers, but some had white. This was because the allele for red flowers is
dominant, and the allele for white flowers is recessive. Genetic diagrams help to show how
this works. In a genetic diagram, you show all of the possible alleles for a particular
characteristic. There will be two alleles from one parent, and two from the other parent,
making four altogether.…read more

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4.) Gametes are involved
5.)There is no mixing of hereditary material
Asexual:
1.) Single parent
2.) Offspring's are genetically exact off springs their parents
3.) No Internal fertilization or External fertilization
4.) No gametes
5.)There is mixing of hereditary material
53. What is mitosis and meiosis?
Mitosis and meiosis are two ways that cells reproduce.
By mitosis a cell splits to create two identical copies of the original cell.…read more

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Repairing damaged immune systems
Making replacement heart valves
55. Where in humans are stem cells found?
There are three basic types of stem cells. Foetal stem cells are found in human beings during
the foetal stage of development. Embryonic stem cells are found in. Adult stem cells, on the
other hand, are found in many different tissues within the human body.
56.…read more

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61. How is cystic fibrosis passed on?
Cystic fibrosis is an inherited disorder that affects the cell membranes, causing the
production of thick and sticky mucus. It is caused by a recessive allele. This means that it must
be inherited from both parents. The genetic diagram shows how this can happen.…read more

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