waves involving the vibration of particles perpendicular to the direction of energy transfer
maximum distance a particle moves away from its undisturbed position
number of vibrations in one second, or the number of wavelengths passing in one second
the highness or lowness of a sound as determined by its frequency
distance between two neighbouring crests or troughs of a wave.
Region in which the particles are father apart than when not disturbed by a wave.
region in which the particles are closer than when not disturbed by a wave
Speed of sound
330m/s (in dry air)
Speed of light
in air300000000 m/s
describes quantities that can have any value and change continuously over time
describes quantities that can have only particular values and are reprisented by numbers
scientificaly accepted belief that all living things are composed of cells produced from pre-existing cells
small structures in a cell with a special function
cells that do not have a nucleus or other membrane bound organelles e.g bacteria
cells that have a nucleus with a membrane around it
the chemical substance found in all living things that encodes the genetic information of an organism. composed of building blocks called nucleotides, which are linked together in a chain.
refers to a trait that requires only one allele to be present for its expression in a heterozygote
describes a gene that is present in an organism but may not be evident in its phenotype.
non sex chromosomes
pair of chromosomes containing information for sexual chatacteristics
information inherited from the parents and contained in the DNA
sum of the physical and mental characteristics of an organism at a particular time. depends on both the genotype and the environment
having the same two alleles for a characteristic
different forms of a gene for a particular characteristic.
having two diferent alleles for a characteristic
describes organisms that for many generations have offspring identical to the parent in a particular characteristic.
process of sorting chromosomes into matched pairs
type of inheritance in which the heterozygote shows the expression of both alleles in its phenotype
type of inheritance in which the heterozygote shows the expression of the two alleles in its phenotype in a blending of its characteristics
changes to DNA sequence, at the gene or chromosomal level
liquid mixture in which the solute is dissolved
atoms or groups of atoms that have lost or gained electrons
positively charged particles found in the nucleus of an atom
particles with no electrical charge that are found in the nucleus of an atom
negatively charged, very light particles in an atom. Electrons move around the nucleus of the atom
chemicals that react with a base to produce a salt and a water. Edible acids taste sour.
chemicals that react with an acid to produce a salt and water. Edible bases taste bitter