Download Biology at a Glance, 3rd Edition by Judy Dodds PDF

By Judy Dodds

This booklet offers in a transparent visible manner the biology fabric wanted for the technological know-how and extra technology GCSE, and for the separate Biology GCSE. It additionally serves as an introductory consultant for AS Biology. it really is illustrated all through with photographs and circulate charts, with questions about each subject, web learn actions and a thesaurus of phrases to remember.

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G. yeast, mushroom, mould Invertebrates (no backbone) Non-flowering plants Moss Insects Ferns Animals (nervous system) Worms Spiders Snails Jellyfish Starfish Pine trees (evergreens) Flowering plants Grass Tulip Bluebell Daffodil Rose Apple tree Oak tree Daisy Questions: 1. What feature do animals share? 2. Why is a mushroom classified as a fungus? 3. List three vertebrates. 4. What structure do bacteria lack? 5. Which group of vertebrates has hair? g. g. g. g. g. cat, humans 45 ECOLOGY FOOD CHAINS AND FOOD WEBS Food web Food chain Energy from sun This is more realistic than a food chain.

Waste product Nitrifying bacteria (change ammonia to nitrates). Ammonia (NH3) Root nodules Nitrogen-fixing bacteria here have a mutualistic relationship with the plant as they both benefit from the relationship. Bacteria in nitrogen cycle Type What they do Saprobiotic (decay) Feed on dead material and release ammonia Nitrifying Convert ammonia to nitrates Denitrifying Convert nitrates to nitrogen gas Nitrogen fixing Convert nitrogen gas to nitrates Questions: 1. Why do plants and animals need nitrogen?

How to produce a genetic fingerprint Collect a source of DNA (blood, skin, hair). Increase the quantity of DNA, if necessary, by the polymerase chain reaction. Small fragments move quickly through gel Skin cells Extract the DNA. (Positive) Cut the DNA into smaller fragments using a restriction enzyme. Negative Gel electrophoresis separates DNA fragments according to size DNA DNA fragment move to positive end Large fragments move slowly DNA fragments at start Make DNA fragments radioactive and therefore visible as black lines (Negative) A genetic fingerprint Genetic fingerprinting was invented by Alex Jeffreys in 1984 at Leicester University.

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