1.1 - Introduction to Cells - Key Terms

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International Baccalaureate Biology (1 - Cell Biology) Flashcards on 1.1 - Introduction to Cells - Key Terms, created by Ella-mentary on 01/15/2016.

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Question Answer
Cell Theory All organisms are composed of cells. The smallest unit of life is a cell. All cells come from pre-existing cells.
Differentiation The alteration of a cell's shape and function through gene expression.
Emergent Property A property of a system that does not appear in any of its component parts.
Growth An increase in physical size.
Homeostasis Process by which organisms maintain a relatively stable internal environment.
Magnification The ratio of image size to actual size. = (image size)/(specimen size)
Metabolism All of the chemical reactions that occur within an organism or within a cell.
Micrometre (µm) 1/1000 of a mm
Millimetre (mm) 1/1000 of a metre
Nanometre (nm) 1/1000 of a µm
Objective lens The part of the microscope that is nearest to the object/specimen.
Paramecium A single-celled organism. It moves using cilia and feeds using an oral groove. a96d02cb-c01f-4d5e-8e9e-eef949ece341.jpg (image/jpg)
Reductionism Biological reductionism is the idea that you can explain complex processes by looking at the simple component parts.
Scale bar A line on a microscope image which is labelled with the actual size of the line. From this the magnification can be calculated.
Stargardt's disease A degenerative eye disease that has been the target of stem cell research.
Stem cells Cells that divide and remain undifferentiated. Two types are totipotent and pluripotent.
Surface area:volume ratio A ratio that decreases as cells grow larger. Above a certain size, cells do not have a large enough surface area to support the exchange of gases or nutrients to support the volume of the cell.
System A level of organisation that includes organs, tissues, and cells.
Tissue A group of similar cells with a common function and structure.
Life processes Movement Growth Reproduction Sensitivity Excretion Nutrition Respiration Homeostasis
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