Biology as unit 2 revision

Stem cells from human embryos can be cloned and made to differentiate into most different types of human cells. Faulty heart valves can be replaced using biological or mechanical valves.

This glucose has been stored as glycogen, and is converted back to glucose when needed. So what exactly do Education Quizzes cover.

You should be able to link the structure of a root hair cell to its function. Stomach enzymes would not work well in the intestine. The number of proponents has no relation to determining whether or not something works. In industry, enzymes are used to bring about reactions at normal temperatures and pressures that would otherwise require expensive, energy-demanding equipment.

These stem cells can usually only differentiate into a limited range of other cells. Specific motifs of regulatory proteins- Certain DNA binding proteins having specific motifs bind certain region of DNA to influence the rate of transcription. There are 20 different types of amino acids, and they join together in a long chain a polypeptide in a specific order to create a specific protein.

The response of a treatment group must be compared to the response of a sham-treated group both groups and clinicians being unaware of which group is recieving which treatment.

It also contains a synapse. Be able to evaluate the practical risks and benefits, as well as social and ethical issues, of the use of stem cells in medical research and treatments.

Contaminated Food and drink: Phloem tissue transports cell sap around the plant. The mRNAs encoding these two protein subunits are encoded by gene sequences that are subjected to extensive DNA sequence-coding changes.

Enzymes lock onto substrates. The cell contains haemoglobin to carry oxygen to the cells. Bacteria can be grown in a nutrient broth solution or as colonies on an agar gel plate. This process is catalysed, sped up, by enzymes. Enzymes speed up this reaction by making it easier for the reacting substances to come together and be rearranged.

AQA GCSE Biology Unit 2

Platelets are fragments of cells which initiate the clotting process at wound sites. This causes an increasing weakness and pain or cramps. The digestive system is one example of a system in which humans and other mammals exchange substances with the environment.

Critique this evidence and suggest a better test of this claim. With electron microscopes, using a beam of electrons instead of a beam of light, you gain a much higher resolution seeing much smaller objects e. The long tail helps move the sperm towards the egg.

Biology- Unit 1

Many genes are now recognized to harbor enhancer or activator elements in various locations relative to their coding regions. Cells are spaced out to allow gas exchange. Blood flowing through the muscles removes lactic acid.

IB Biology

When they fuse, the chromosomes from each cell come together in a new nucleus. Using stem cells that are created from the patients own cells avoids this problem. Stems support the plant and assist in the transport of water and nutrients between the roots and the leaves.

Using embryonic stem cells is an easy option medically as they are easier to work with, but putting cells from one body into another means that the patient would have to take heavy medication for the rest of their life.

Lipases break down lipids fats to glycerol and fatty acids. We know you want to do well and we want to help you out. Cross-listed with NRSC It also emulsifies fat to form small droplets which increases the surface area. Contact the individual instructors with any specific questions about course content.

The large permanent vacuole speeds up the movement of water by osmosis from the soil across the root hair cell. The rate and depth of your breathing increases, because oxygen and carbon dioxide in the blood need to be exchanged faster with air in the lungs.

The long tail helps move the sperm towards the egg. Roots absorb water and mineral ions for the plant and hold the plant in place.

Leaving Cert Biology - Class Notes: Unit 1 -The Study of life. Class Notes Microsoft Word. CGP AS Biology has Units 1 & 2, A2 Biology has Unit 4 & 5 Old AQA unit 1 and 2 biology papers» I just did 8 biology papers (unit 1) in the space of a couple of.

Plant Cells: Like animal cells, plant cells usually have a nucleus, cell membrane, mitochondria, cytoplasm, and cells also have a cell wall made of a carbohydrate called cellulose is made of tiny fibres, and together these fibres become very strong and support the cell.

Some plant cells also have organelles. Winter School. Date: July The winter break gives students the opportunity to get ahead in a time-efficient and relatively painless manner and revise Unit 3 course materials to VCAA examination standard.

Winter School – Unit 2 & Unit 4 Head Start Lectures. Past papers, summary notes and past exam questions by topic for AQA Biology A-level Unit 2.

AQA GCSE Biology Unit 2 (BL2) Revision Notes based on current specification content/5(81).

Biology as unit 2 revision
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Biology unit 2 - Revision Cards in GCSE Biology