Flashcards
Biology Unit 1 Keywords
Cards in this deck (40)
- 1HealthyBeing free from diseases or infections
- 2FitMeasure of how well you can perform physical tasks
- 3PathogensMicro-organisms that cause disease
- 4Active ImmunityImmune system makes its own antibodies and is usually permanent
- 5Passive ImmunityUsing antibodies made by another organism and is often temporary
- 6Benign TumourGrows until there is no more room and the cells stay where they are. Usually harmless
- 7Malignant TumourGrows and can spread to other cells in the body. Often dangerous and fatal
- 8PlaceboSugar coated pill which looks like the real drug but does nothing
- 9Double Blind TrialNeither scientist nor patient know whether the drug being given is genuine or a placebo
- 10DepressantsDecrease brain activity, slowing down responses of the nervous system
- 11StimulantsIncrease brain activity and make you feel more alert
- 12PainkillersReduce the number of painful stimuli at the nerve endings near an injury
- 13Performance EnhancersHelp to build muscle and make people train harder
- 14HallucinogensDistort perception by altering pathways the brain sends messages down
- 15RetinaLight Sensitive part of the eye covered in receptors called rods and cones
- 16Long-SightednessLens is wrong shape and doesn't bend the light enough. Images of near objects brought into focus behind retina
- 17Short-SightednessLens is wrong shape and bends the light too much. Distant objects brought into focus in front of the retina
- 18Binocular VisionTwo eyes working together to allow you to judge depth
- 19SynapseConnection between two neurones
- 20HomeostasisMaintaining a constant internal environment
- 21Type 1 DiabetesPancreas produces little or no insulin. Insulin must be injected and diet controlled.
- 22Type 2 DiabetesBody becomes resistant to insulin, causing blood sugar to rise to a dangerous level. Diet must be controlled to treat this
- 23AuxinsPlant hormones which control growth at tips of shoots and roots
- 24PhototropicGrow towards light
- 25GeotropicGrow towards gravity
- 26GeneSequence of nucleotides forming a short length of a chromosome
- 27Chromosomes23 pairs of nucleic acid and proteins found in the nucleus which carry genetic information
- 28DNADeoxyribonucleic acid. Self-replicating material found within a chromosome and is the carrier of genetic information
- 29GametesSperm cells and egg cells
- 30MutationsChanges to the genetic code, creating new characteristics and more variation
- 31AllelesDifferent versions of the same gene
- 32HomozygousTwo identical alleles for a particular gene
- 33HeterozygousTwo different alleles for a particular gene
- 34GenotypeThe genetic makeup of a person (the alleles one carries for a particular gene)
- 35PhenotypeThe characteristics produced by an allele that a person displays physically
- 36Dominant AlleleThe characteristic that appears visible is caused by a dominant allele
- 37Recessive AlleleThe characteristic that can only appear if there is no presence of a dominant allele
- 38KwashiorkorForm of malnutrition caused by lack of protein. Most common symptom is a swollen stomach
- 39ParasiteOrganism which lives off another at the other's expense
- 40VectorsCarry disease without being infected by it themselves
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- AS - Level Biology Flashcards on Biology Unit 1 Keywords, created by Zainab Riaz on 14/05/2015.
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