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The study of Biology lecture 1.3

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Page 1: The study of Biology lecture 1.3. Science as a process Uses an organized approach to learn how the natural world works. Uses an organized approach to

The study of Biologylecture 1.3

Page 2: The study of Biology lecture 1.3. Science as a process Uses an organized approach to learn how the natural world works. Uses an organized approach to

Science as a process Uses an organized approach to learn how

the natural world works. Principle: (a) events have natural causes (b) Uniformity: the laws of nature act the

same everywhere

fertilizationWhere stars are born

Page 3: The study of Biology lecture 1.3. Science as a process Uses an organized approach to learn how the natural world works. Uses an organized approach to
Page 4: The study of Biology lecture 1.3. Science as a process Uses an organized approach to learn how the natural world works. Uses an organized approach to

Owl experiment Question: do owls hunt by hearing? Hypothesis: an if…….then statement Prediction: what will happen if the H. is true? Experiment: independent variable: light/dark Dependent variable.: distance from owl’s

strike to mouse Analyze data: owls hunt by sound in the dark,

by sight in the light Communicate results: paper, internet, peer

review

Page 5: The study of Biology lecture 1.3. Science as a process Uses an organized approach to learn how the natural world works. Uses an organized approach to

Compound light microscope

To see cells, small organisms

Eyepiece: X10Objective lenses: X 10-

X60Stage: supports the slideLight: illuminates from

below

Page 6: The study of Biology lecture 1.3. Science as a process Uses an organized approach to learn how the natural world works. Uses an organized approach to

Magnification Increases in the

object’s apparent size Multiply eyepiece X

lens 10X 60 = 600X

Resolution

Clarity of image, ability to show detail

Breast cancer cellsOnion membrane

Page 7: The study of Biology lecture 1.3. Science as a process Uses an organized approach to learn how the natural world works. Uses an organized approach to

Electron microscopesShoots a beam of electrons at a sample

Creates black & white images (colored later)

SEM: gives 3D pictures of surfaces of cells, viruses @ 100,000X magnification

TEM: scans slices of specimens

200,000 X magnification

Hydrothermal worms: FEI scannerPlant cell

Page 8: The study of Biology lecture 1.3. Science as a process Uses an organized approach to learn how the natural world works. Uses an organized approach to

Metric system

Measurement system used by all scientists

Based on powers of 10

Page 9: The study of Biology lecture 1.3. Science as a process Uses an organized approach to learn how the natural world works. Uses an organized approach to

Conformed Dimensions of Data Quality – An Organized Approach to Data Quality Measurement

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