Cell Biology Lecture 2

• All living organisms are composed of cells.
• The cell is the basic unit of life.
• ells arise by division of pre-existing cells.

A special type of fluorescence microscope that allows you to see objects in 3 dimensions.

Experiment set up to ensure that only one variable is tested when performing an experiment to test a hypothesis.

• Forming and testing a hypothesis
• “Scientific Method”
• Deductive reasoning (“If… then…” logic)
• Deductive: General to Specific

A light microscope that uses light with a shorter wavelength than visible light (UV) to excite dyes that then emit light (fluorescence) at a longer wavelength.

A possible explanation for an observation that is testable by experiment.

• Making observations /measurements (data) - quantitative - qualitative - must be repeatable
• Inductive: Specific to General

An optical instrument with lenses that refract (bend) visible light to magnify images of specimens.

Appearing to make objects look larger such that very small objects such as cells can be seen by the human eye.

In conducting an experiment you are testing a specific prediction arising from your hypothesis.

A measure of the ability of a lens to discriminate between two objects.

A microscope that uses an electron beam to scan the surface of a sample to study details of its topography.

A broad explanation supported by many observations or experiments

A microscope that passes an electron beam through very thin sections, primarily used to study the internal ultrastructure of cells.