Download AQA AS Biology Student Unit Guide : Unit 1 Biology and by Martin Rowland, Steve Potter PDF

By Martin Rowland, Steve Potter

Excellent for revision, those publications clarify the unit necessities, summarise the content material and contain specimen questions with graded answers.
Martin Rowland has taught and tested A-level Biology for over 30 years and is presently a Chair of Examiners in Biology. he's co-author of the winning titles AQA Biology for AS and AQA Biology for A2, released via Hodder schooling.

Show description

Read Online or Download AQA AS Biology Student Unit Guide : Unit 1 Biology and Disease PDF

Similar diseases books

Hepatitis - A Medical Dictionary, Bibliography, and Annotated Research Guide to Internet References

It is a 3-in-1 reference ebook. It supplies a whole scientific dictionary masking enormous quantities of phrases and expressions when it comes to hepatitis. It additionally offers huge lists of bibliographic citations. ultimately, it presents info to clients on how you can replace their wisdom utilizing quite a few net assets.

Massage and the Original Swedish Movements

Leopold is overjoyed to post this vintage ebook as a part of our vast vintage Library assortment. some of the books in our assortment were out of print for many years, and as a result haven't been available to most of the people. the purpose of our publishing application is to facilitate swift entry to this immense reservoir of literature, and our view is this is an important literary paintings, which merits to be introduced again into print after many a long time.

Lipid Peroxidation

The aim of this ebook is to pay attention to fresh advancements on lipid peroxidation. The articles amassed during this e-book are contributions by means of invited researchers with a long-standing adventure in numerous learn parts. we are hoping that the fabric awarded this is comprehensible to a wide viewers, not just scientists but additionally individuals with common historical past in lots of various organic sciences.

Biochemical Aspects of Nervous Diseases

Inside of fresh years uncomplicated wisdom about the chemistry, and the metabolic procedures happening within the mind, spinal wire, peripheral nerves and muscular tissues has elevated in a notable demeanour. consequently a few vitally important books were released either in the United States and in Europe during which a few, no less than, of this knowledge has turn into to be had in an simply readable shape to an ever expanding staff of laboratory and medical employees.

Extra info for AQA AS Biology Student Unit Guide : Unit 1 Biology and Disease

Sample text

For the process of simple diffusion, the relationship between the above points is expressed in the formula: rate of diffusion ∝ ●● surface area × difference in concentration thickness of exchange surface (diffusion distance) For facilitated diffusion, this formula is modified to: number of transport proteins × difference in concentration rate of diffusion ∝ thickness of exchange surface (diffusion distance) Key facts you must know and understand Figure 33 shows the location of some transport proteins and outlines the mechanism of the uptake of sodium ions and of glucose.

B It is important to write that these arteries carry blood to heart muscle. c This is wrong — smoking is not directly linked to high cholesterol levels. d,e These factors and their explanations are correct and score 2 marks. Unit 1: Biology and Disease 59 Questions & Answers Student B (a) (i) Coronary artery a (ii) They carry blood rich in oxygen to the cardiac muscle b so that it can release energy c for contraction d. (b) Stress can lead to higher blood pressure. Hypertension (sustained high blood pressure) can increase atherosclerosis.

Some bacteria have a ‘capsule’ outside the cell wall. Lipopolysaccharide capsule Peptidoglycan cell wall Main DNA molecule Flagellum Plasma membrane Plasmids Figure 34 The cholera bacterium (Vibrio cholerae) The cholera bacterium (Vibrio cholerae) causes disease in the following way. ●● It is transmitted in polluted water. ●● In the small intestine, the bacterium anchors itself to the epithelial cells, multiplies and produces a toxin. ●● The toxin affects transport proteins in the plasma membrane of the epithelial cells.

Download PDF sample

Rated 4.64 of 5 – based on 33 votes