Physics revision for igcse

Humans have two copies of each gene in their cells. Osmosis The passive movement of water from an area of high concentration of water to an area of low concentration of water along a concentration gradient. Enzymes usually work best at body temperature and neutral pH. Plant Biology Photosynthesis is the process where plants make Physics revision for igcse food glucose, from carbon dioxide and water.

Cell membrane The membrane around a cell which controls what moves in and out of the cell. The left side of the heart carries oxygenated blood that has returned from the lungs and is pumped to the body.

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Mitosis is used for growth and repair, and is the only method of reproduction in asexually reproducing organisms such as bacteria.

Inside the medium is frequency is ……………Hz and its wavelength is ………. Organisms produce more offspring than can survive, and only those with characteristics beneficial to their environment will pass on their traits to their offspring. Auxins make cells grow longer.

When the vigorous exercise stops, excess oxygen is breathed in to break down the lactic acid. When we are thirsty, our body conserves water by secreting ADH from the pituitary gland.

Overexploitation can happen to resources, plants or animals that are consumed for human uses. We can produce heat from respiration. Oxygen diffuses out of the capillaries into the tissues, while carbon dioxide diffuses into the blood.

The ileum is long and has a very large surface area.


After contact with an antigen, B cells differentiate into antibody-secreting plasma cells. This provides instant protection but is temporary because once the antibodies have gone, the person does not have memory cells for that antibody.

Neurones Basic cells of the nervous system that carry minute electrical impulses around the body. Pathogens Microorganisms which can cause disease in humans and other organisms. Denatured Enzymes that are denatured have unfolded protein structures and can no longer catalyse a reaction.

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Ribonucleic acid RNA A class of single-stranded polynucleotides containing ribose sugar and the pyrimidine uracil, that replaces thymine. Stomata Openings in the leaves of plants that allow gases to enter and leave the leaf.

They are very thin one cell thick and are responsible for delivering nutrients to and removing wastes from all tissues in the body. Veins have thinner walls. Central nervous system CNS The central nervous system is made up of the brain and spinal cord where information is processed.

A calorimeter can be used to measure the energy content of food. It is involved in making the gametes for sexual reproduction. Some microbes are very useful for the production of food. Microorganism Bacteria, viruses and other small organisms which can only be seen using a microscope.

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Award-winning tutorials, tips and advice on GCSE English, French, German, ICT, maths and physics coursework and exams for students, parents and teachers. Gravitation. Gravitational field strength at a point is defined as the gravitational force per unit mass at that point.

Newton's law of gravitation: The (mutual) gravitational force F between two point masses M and m separated by a distance r is given by. "Doc Brown's Chemistry" is a website designed for UK science students studying GCSE Biology, GCSE/IGCSE Chemistry, GCSE Physics and Advanced Level Chemistry.

Physics revision for igcse
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