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Science 1

TermDefinition
Eyepiece A lens through which the eye views the image formed by the objective.
Light Microscope A microscope that uses light to view close ups of a specimen.
Micrometre A unit of measurement equivalent to one thousandth of a millimetre or one millionth of a metre.
Nanometre A unit of measurement equivalent to one billionth of a metre.
Nucleus The part of the cell containing genetic material and bound by the nuclear membrane.
Objective A lens that receives rays from the specimen and forms an image in the focal plane of an eyepiece.
Organelle A specialised part of a cell that has a specific function.
Specimen A sample to be examined or observed.
Small Molecule a small molecule is a low molecular weight organic compound that may regulate a biological process, with a size on the order of 1 nm. Most drugs are small molecules
Virus An infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.
Bacterium A member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some which can cause disease.
Magnification The action of magnifying something or the process of being magnified.
Electron A negatively charged particle.
Pathogens Disease causing micro-organisms.
Prokaryotic Without a nucleus.
Resolution The ability to clearly distinguish between two separate but adjacent structures.
Scanning Electron Microscope A microscope in which the specimen is examined using a moving electron beam from which the electrons are reflected to form a magnified three dimensional image.
Transmission electron Microscope A microscope that passes beams of electrons rather than light through the specimen to view it at very high magnification.
Vacuum An area of which there is reduced number of air particles.
Active Agent A chemical within the substance that does the work
Asexually Without sex; involves only one parent.
Binary Fission Splitting of one cell into two equally sized daughter cells.
Capsule A membrane enclosing the cytoplasm of the cell.
Cell Membrane A membrane enclosing the cytoplasm of the cell.
Cell Wall The outer structure of bacteria and plant cells.
Chromosome The unit of heredity, made of DNA and proteins.
Cytoplasm A jelly-like substance in which organelles are located within a cell.
DNA Deoxyribonucleic acid, the genetic material found inside cells.
Flagellum A tail-like structure used for movement.
Pili Hair-like extensions found on some bacteria and used for reproduction
Sexual Reproduction The exchange of genetic material from two parents.
Created by: gunthel
 

 



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