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Aqa gcse biology unit 1 higher tier past papers 2018

by ozaurora
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23 July 2018
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changes. Some athletes take drugs to improve performance. Suggested ideas for practical work to develop skills and understanding include the following: design and carry out an investigation to measure the rate of decay of bread by, for example, exposing cubes of bread to air before placing them in sealed Petri dishes at different. The biomass at each stage can be drawn to scale and shown as a pyramid of biomass. C) Modern cloning techniques include: tissue culture using small groups of cells from part of a plant embryo transplants splitting apart cells from a developing animal embryo before they become specialised, then transplanting the identical embryos into host mothers adult cell cloning the nucleus. B1.7.2 Reproduction a) There are two forms of reproduction: sexual reproduction the joining (fusion) of male and female gametes. Our bodies provide an excellent environment for many microbes which can make us ill once they are inside. C) Candidates should be aware of the use of statins in lowering the risk of heart and circulatory diseases. Very low doses of the drug are given at the start of the clinical trial. Thalidomide had not been tested for use in pregnant women. The body can respond by rapidly making the correct antibody, in the same way as if the person had previously had the disease. Did you get something along the lines of 590 ish? The eggs are collected from the mother and fertilised by sperm from the father. Apple or, google Play. Models allow us to suggest relationships between organisms. Neither the doctors nor the patients know who has received a placebo and who has received the drug until the trial is complete. Suggested ideas for practical work to develop skills and understanding include the following: investigate the optimum conditions for the growth of cuttings, of, eg Mexican hat plants, spider plants, African violets investigate the best technique for growing new plants from tissue cultures (eg cauliflower). Examples include stimulants that boost bodily functions such printable as heart rate; and anabolic steroids which stimulate muscle growth. 1 Adaptations a) To survive and reproduce, organisms require a supply of materials from their surroundings and from the other living organisms there. These resulted in women suffering significant side effects birth-control pills now contain a much lower dose of oestrogen, or are progesterone only progesterone-only pills lead to fewer side effects giving FSH and LH in a fertility drug to a woman whose own level of FSH. They also help us to control conditions inside our bodies. D) In genetic engineering, genes from the chromosomes of humans and other organisms can be cut out using enzymes and transferred to cells of other organisms. The drug was then banned. B bacteria and viruses may reproduce rapidly inside the body and may produce poisons (toxins) that make us feel ill. J) Mutations of pathogens produce new strains. I) Many strains of bacteria, including mrsa, have developed resistance to antibiotics as a result of natural selection.

Aqa gcse biology unit 1 higher tier past papers 2018

B1, such changes may be caused by living or nonliving factors such as a change in a competitor. But do summary not kill the pathogens. Knowledge and understanding to, and slimming products, to prevent further resistance arising it is important to avoid overuse printable of antibiotics. Changes in the environment may affect the distribution and behaviour of organisms.

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Aqa gcse biology unit 1 higher tier past papers 2018

Are medicines that help to cure bacterial disease by killing infectious bacteria inside the body. There is no mixing of genetic information and so no genetic variation in the offspring. An unbalanced diet may also lead to deficiency diseases or conditions reviews such as Type 2 diabetes. Knowledge and understanding to, b1, cultures should be incubated at a maximum temperature of. N In school and college laboratories, some drugs are addictive 4, interpret pyramids of biomass and construct them from appropriate information. Giving oral contraceptives that contain hormones to inhibit FSH production so that no eggs mature oral contraceptives may contain oestrogen and progesterone to inhibit egg maturation the first birthcontrol pills contained large amountsof oestrogen. Some of these drugs are banned by law and some are legally available on prescription. Thalidomide has been used successfully in the treatment of leprosy and other diseases. E The uses of hormones in controlling fertility include.