LESSON #1What is so extraordinary about the organization of living organisms?

Prof. Beatriz Duro SEK Ciudalcampo International School

THE SIZE OF LIFEMeasuring skills

Prof. Beatriz Duro SEK Ciudalcampo International School

Levels of biological organizat

ion

Before the 1800s

How large are things really? Microscopic objects are

meassured in: μm = 10-3 mm Nm = 10-6 mm

(1000 μm =1mm) Not visible with a naked

eye. Eye resolution is 0,2 mm

If two objects are separated by a smaller distance, we will see them as one.

Exercise 1: If an object meassures 1 mm, how many micrometers does it meassure? And how many nanometers?

Exercise 2: Calculating sizes

Paramecium caudatum magnified 300 times

3.6 cm

What is the size of the paramecium? Could we see it with our naked eye?

Average sizeChoosing samples to measure Using a scale

100 µm

Homework worksheet 1