My Revision Notes: WJEC/Eduqas AS/A-Level Year 1 Biology
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Language
English
ISBN
9781398355347
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Title Page
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Contents
Countdown to my exams
Exam breakdown
Unit 1 Basic biochemistry and cell organisation
1 Chemical elements and biological compounds
Water is essential to all life on Earth
Inorganic ions have a range of functions in living organisms
Monomer molecules join together to make polymers
Carbohydrates contain carbon, hydrogen and oxygen
Lipids are made up of the same elements as carbohydrates
Proteins are an incredibly varied class of biological molecules
2 Cell structure and organisation
There are many different types of eukaryote cell
Plant and animal cells have some organelles in common
Animal cells also contain lysosomes and centrioles
Plant cells have chloroplasts and a cell wall
Prokaryotes do not contain membrane-bound organelles
Viruses contain no cytoplasm so are not considered cells
Cells make up tissues in animals and plants
3 Cell membranes and transport
All matter entering cells passes through the plasma membrane
4 Biological reactions and enzymes
Enzymes are biological catalysts
Enzyme inhibitors can impede an enzyme’s activity
5 Nucleic acids and their functions
DNA and RNA are both nucleic acids
Protein synthesis is of vital importance in cells
6 Genetic information
In cell division a cell splits to form daughter cells
Meiosis has two stages – meiosis I and meiosis II
Unit 2 Biodiversity and physiology of body systems
7 Organisms are related through evolutionary history
Organisms are grouped according to their evolutionary relationships
Biodiversity refers to all species in a specific ecosystem
8 Adaptations for gas exchange
Aerobic respiration involves oxygen absorption
Insects have a tracheal system
Larger animals have specialised respiratory surfaces
Leaves are adapted for photosynthesis and gas exchange
9 Adaptations for transport
Different animal groups have a range of vascular systems
Mammals have a number of different blood vessels
Oxygen is transported in the blood as oxyhaemoglobin
Plants have vascular tissue for transport
Angiosperms adapt to environmental conditions
Translocation is the transport of the products of photosynthesis
10 Adaptations for nutrition
Organisms use a range of adaptations for nutrition
Multicellular organisms have a range of gut adaptations
Digestion of food requires enzymes and varying conditions
Organisms have dentition and guts adapted to their diet
Parasites derive nutrients from a host organism
Glossary
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