# 01.4 Tools and Procedures DCS

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### Tools & Procedures:

Tools & Procedures

### Tools & Procedures:

Tools & Procedures What is the most dangerous thing in a science lab ? You are.

### A Common Measurement System:

A Common Measurement System What measurement system do most scientists use?

### A Common Measurement System:

A Common Measurement System Most scientists use the metric system when collecting data and performing experiments. Because the metric system is based on multiples of 10, it is easy to use.

### Common Measurement System:

Common Measurement System In Science, we use the metric system – base 10 system How big is this pillbug? Length is measured in: meters centimeters millimeters

### Common Measurement System:

A single measurement system is commonly used in science because: it allows scientists to easily replicate one another’s experiments. basic units of mass, length, and volume are unrelated to one another. more kinds of measurements can be made. computers can store large amounts of scientific data. Common Measurement System

### Volume (liters, ml) :

Volume (liters, ml) -how much space something takes up -usually a measure of liquids - use a beaker or graduated cylinder

### Mass - grams or kg:

Mass - grams or kg

### Temperature (celsius):

Temperature (celsius)

### A Common Measurement System:

A Common Measurement System 1 meter (m) = 100 centimeters (cm) 1 meter = 1000 millimeters (mm) 1000 meters = 1 kilometer (km) 1 kilogram (kg) = 1000 grams (g) 1 gram = 1000 milligrams (mg) 1000 kilograms = 1 metric ton (t) 0 0 C = freezing point of water 100 0 C = boiling point of water 1 liter (L) = 1000 milliliters (mL) 1 liter = 1000 cubic centimeters (cm 3 )

### Microscopes:

Microscopes Microscopes Microscopes are devices that produce magnified images of structures that are too small to see with the unaided eye.

Light Microscope

### Microscopes:

Copyright Pearson Prentice Hall Microscopes Light Microscopes The most commonly used microscope is the light microscope. Light microscopes produce clear images of objects at a magnification of about 1000 times .

### Microscopes:

Microscopes Compound light microscopes allow light to pass through the specimen and use two lenses to form an image.

### Slide15:

- Transmission Electron Microscope (flat) *both SEM and TEM can only image dead specimens

### Microscopes:

Copyright Pearson Prentice Hall Microscopes Electron Microscopes To study even smaller objects, scientists use electron microscopes .

### What is this?:

What is this? A Banana

### What is this?:

What is this? Toilet Paper

### What is this?:

What is this? Snowflake

### What is this?:

What is this? A CD Groove

### What is this?:

What is this? The head of an ant

### What is this?:

What is this? Velcro

### What is this?:

What is this? Used Dental Floss

### What is this?:

What is this? Needle and thread

### What is this?:

What is this? Mascara Brush

### What is this?:

What is this? A Fingerprint

### What is this?:

What is this? A Red Blood Cell on a pin tip

### What is this?:

What is this? Ear Drum

### What is this?:

What is this? A Bloodclot

### Laboratory Techniques:

Copyright Pearson Prentice Hall Laboratory Techniques Laboratory Techniques Cell Cultures A single cell is able to reproduce so that a group of cells, called a cell culture , develops from the single original cell.

### Cell Cultures:

Cell Cultures - single cell grown on nutrients will divide and form millions of cells

### Laboratory Techniques:

Copyright Pearson Prentice Hall Laboratory Techniques Cell Fractionation Biologists often use a technique known as cell fractionation to separate the different cell parts.

### Cell Fractionation:

Cell Fractionation - cells broken and parts are separated

### 1-4:

Copyright Pearson Prentice Hall 1-4 Compared to a light microscope, an electron microscope is used to observe larger objects with less detail. larger objects with more detail. smaller objects with more detail. smaller objects with less detail.

### 1-4:

Copyright Pearson Prentice Hall 1-4 A device that separates cell parts is a: centrifuge. cell culture. light microscope. electron microscope.

### 1-4:

Copyright Pearson Prentice Hall 1-4 A technique in which cells are grown in a nutrient solution is known as staining. cell fractionation. cell culturing. cell fertilizing.

### Slide37:

Check for Understanding: 1. What tool would you use to measure volume? ______________________ 2. What UNIT would the mass of a person be measured in? ____________________ 3. What type of electron microscope takes very thin images? _______________ What type takes 3D images? ____________ 5. What UNIT should you use to measure the length of a finger?