A2 Biology Revision

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Can you name the Keywords from the textbook definition?

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DescriptionKey Word
Filamentous protein which is involved in contraction within cells. Especially Muscle cells.
A condition in which the alleles of a particular gene are different
The number of times an allele occurs within the gene pool
An animal that maintains its body temperature by physiological mechanisms
Widening of the Internal diameter of blood vessels
A technique used to separate DNA fragments of different lengths by placing them on Agar Gel and passing a voltage across them
Process of making many copies of a specific sequence of DNA or part of a gene
A cell which has a membrane bound nucleus that contains chromosomes as well as other membranous organelles eg. ribosome.
A junction between neurones in which they do not touch but have a narrow gap, the synaptic cleft, over which a neurotransmitter can pass
A gap in the myelin sheath that surrounds the axon of a neurone
The breaking down of large molecules into smaller ones by the addition of water molecules
A hormone produced by beta cells in the islets of langerhans in the pancreas, which decreases blood glucose levels by increasing the rate of conversion of glucose to glycogen
A length of DNA on a chromosome normally coding for a particular polypeptide
The conversion of glycogen to glucose
A nerve cell adapted to conduct action potentials
Series of aerobic biochemical reactions in the matrix of the mitochondria of more eukaryotic cells by which energy is obtained through the oxidation of acetylcoenzyme A
A fatty substance that surrounds axons and dendrites in certain neurones
Protein channels across a cell surface membrane that uses ATP to move sodium ions out of a cell in exchange for potassium ions which move in
Undifferentiated dividing cells that occur in embryos and in adult animal tissues that require constant replacement eg. bone marrow
The range and variety of living organisms within a particular area
A carrier. The term may refer to something such as a plasmid which carries DNA into a cell
Mutated versions of proto-oncogenes that result in increased cell division. Normally resulting in a tumour
A detectable alteration in the internal or external environment of an organism that produces some change in that organism
The place where an organism normally lives, which is characterised by physical conditions and the species of other organisms present
Selection that operates towards one extreme in a range of variation.
A synapse that occurs between a Neurone and a Muscle
A sequence of 3 adjacent nucleotides in mRNA that codes for one amino acid
A variable which limits the rate of a chemical reaction
The thick filamentous protein found in skeletal muscle
DescriptionKey Word
Region of the brain adjoining the pituitary gland that acts as a control for the autonomic nervous system and regulates body temperature and fluid balance
Stage of photosynthesis which does not require light energy but does need the products of the LDR
A biochemical pathway that forms part of the light independent reaction of photosynthesis, during with CO2 is reduced to form carbohydrate
A gene that maintains normal rates of cell division and so prevents the development of tumours
Stage of photosynthesis in which the light energy is required to produce ATP and reduced NADP
The maintenance of a more or less constant internal environment
Consequence of an increase in nutrients in fresh water lakes and rivers, often leads to a decrease in biodiversity
Period during which the membrane of the axon of a neurone cannot be depolarised and no new action potential can be initiated
Refers to experiments which are carried out within living bodies
The conversion of glucose to glycogen
An animal that uses the environment to regulate its body temperature
Change that Occurs in the electrical charge across the membrane of an axon when it is stimulated and a nerve impulse passes
A process, usually branched, extending from the cell body of a neurone, which conducts impulses towards the cell body
The process linking glycolysis with the krebs cycle in which H and CO2 are removed from pyruvate to produce acetyl coenzyme A in the matrix of the mitochondria
A plant adapted to living in dry conditions
The conversion of non-carbohydrate molecules to glucose
A hormone produced by alpha cells of the islets of Langerhans in the pancreas that increases blood glucose levels by initiating the breakdown of glycogen
Refers to experiments carried out outside the living bodies
Portions of DNA within a gene that do not code for a polypeptide. Removed from the pre-messenger RNA after transcription
A more or less self-contained functional unit in ecology made up of all the interacting biotic and abiotic factors in a specific area
A group of enzymes that cut DNA molecules at a recognition sequence
Narrowing of the internal diameter of blood vessels
One form of a gene.
The first part of cellular respiration in which glucose is broken down anaerobically in the cytoplasm into 2 molecules of pyruvate
Any microorganism which causes disease
Part of the nervous system, controlling the muscles and glands, that is not under voluntary control
An enzyme that acts on a specific region of the DNA molecule to break down hydrogen bonds between the bases causing the 2 strands to separate and expose the nucleotide bases
Formation of messenger RNA molecules from the DNA that makes up a particular gene. It is the 1st stage of protein synthesis
A mechanism by which genetic diseases, may be cured by masking the effect of the defective gene by inserting a functioning gene

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