OCR B7 Key Words with Definition

All the keywords from the pages in the OCR textbook with definitions from the back of the textbook for unit b7

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B7 KEY WORDS
Organic Contains Carbon
Photosynthesis The process in green plants which uses energy from sunlight to
convert carbon dioxide and water into the sugar glucose
Autotroph An organism which produces its own organic compounds
Heterotroph An organism which must eat other organisms for its source of organic
compounds
Carbohydrate A natural chemical made of carbon, hydrogen and oxygen. The
hydrogen and oxygen are present in the proportions as water. An example is
glucose C6H12O6. Carbohydrates includes sugars, starch, and cellulose
Chloroplast An organelle found in some plants where photosynthesis takes place
Chlorophyll A green pigment found in chloroplasts
Proteins Chemicals in living things that are polymers made by joining together
amino acids
Cellulose The fibre that makes up most of the fibre in food. The human body
cannot digest cellulose
Starch A type of carbohydrate found in bread, potatoes and rice. Plants produce
starch to store the energy food they make by photosynthesis. Starch molecules
are a long chain of glucose molecules
Polymers A material made up of very long molecules. The molecules are long
chains of smaller molecules
Respiration A series of chemical reactions in the cells which release energy for the
cell to use
Nitrate Ions An ion is an electrically charged atom or group of atoms. The nitrate
ion has a negative charge, NO3-
Osmotic Balance If a cells contains too high a level of dissolved chemicals it will
gain too much water by osmosis. If a cells' level of chemicals is too low, it will lose
too much water by osmosis. When the cell has the correct level of dissolved
chemicals, it is osmotically balanced
Yield The crop of a yield is the amount of crop that can be grown per area of land

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Limiting Factor The factor which prevents the rate of photosynthesis from
increasing at a particular time. This may be light intensity, temperature, carbon
dioxide concentration, or water availability
Compensation Point Respiration uses glucose in a plant, photosynthesis
produces glucose in a plant. When respiration and photosynthesis are taking
place in a plant at the same rate, there is no net gain or loss of glucose.…read more

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Sickle-Cell Anaemia A disease in which a large number of red blood cells are sickle
shaped and cannot carry oxygen properly
Haemoglobin The protein molecule in red blood cells. Haemoglobin binds to
oxygen and carries it around the body.…read more

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Autoradiography Gene probes are often made using radioactive DNA bases. The
radioactivity blackens X-ray film, which shows whether the probe has bound to
the DNA sample
Plasma The clear straw-coloured fluid part of the blood
Circulatory System The heart and blood vessels.…read more

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Co-dominant Some genes have two alleles which are neither dominant nor
recessive. If a person has a copy of both these alleles, they will both be expressed
and show up in that person. These alleles are co-dominant
Atrium (plural of atria) One of the upper chambers of the heart. The two atria
pump blood to the ventricles
Ventricle One of the lower chambers of the heart. The right ventricle pumps blood
to the lungs.…read more

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ATP (Adenosine triphosphate) is a chemical used by living things to store and
transfer energy during chemical reactions
Vertebrate An animal with a spinal column (backbone)
Skeletal-Muscular System All the bones and muscles which work together to
move the body
Skeleton The bones that form the framework for the body. The skeleton supports
and protects the internal organs, and provides a system of levers to allow the
body to move.…read more

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