Biology Flashcards
What are the 3 main points of cell theory?
-all living things or organisms are composed of cells, organisms may be unicellular or multicellular
-cells are the fundamental unity to life. They contain genetic information that determines the functions: metabolism, which allows them to carry out the functions, and they are capable of reproduction.
-all cells are produced from other cells through cell division, a concept referred to as biogenesis
What is biogenesis?
The beginning of life
What is spontaneous generation or abiogenesis?
Living organisms arose from non living entities
What did Louis Pasteur prove wrong with his experimental method ?
Spontaneous generation or abiogenesis
What are organelles?
Non living, specialized function which contributed to the overall functioning of the cell
What are cells?
The basic unit of life, become specialized to form different tissues, un specialized cells refer to as stem cells
What are tissues?
They work together to form organs
What are organs?
Similar functions that work together
What are organ systems?
Made up of organs with similar functions working together
What contribution did Hans and Zachariah janssen have?
Involved eye piece, objective lens, could magnify objects to approximately 20x there original size
What contribution did Robert Hooke have?
3 lenses system, shining a beam of light to illuminate organism, coining the term “cell” to describe that he saw under microscope
What contribution did Antoni van leeuwenhoek have ?
Simple design with higher magnification, first observations of moving, living single felled organisms called these “animalcules” today known as bacteria & protozoan
What is oil immersion?
Put oil on a slide, pense goes into oil so your looking through the oil to see the specimen
define fluorescence:
imaging technique used to show molecules on the membrane of cells in more detail. can be used to ‘label’ cancerous cells in order to distinguish them from healthy cells
define dark field microscopy:
a method of diffracting light to better illuminate transparent organisms without stain.
