Scientific Method

The Metric System

Matter & Water

Macromolecules & Enzymes Cells

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Question 1 - 10

• You should always be aware of and follow these in a lab.

Answer 1 – 10

• What are lab safety rules?

Question 1 - 20

• A hypothesis is a proposed scientific explanation based on prior knowledge. A well tested explanation that unifies a broad range of observations is this.

Answer 1 – 20

• What is a theory?

Question 1 - 30

• Scientists are always observing a doing this. It is the first step of the scientific method.

Answer 1 – 30

• What is asking questions?

Question 1 - 40

• This type of variable refers to what is observed or measured in an experiment. It changes in response to the manipulated variable.

Answer 1 – 40

• What is the responding variable?

Question 1 - 50

• In an experiment, this is the variable that you purposefully change. In our rabbit example, it would be the rabbit who was given the ice pack.

Answer 1 – 50

• What is the manipulated variable?

Question 2 - 10

• This is the common measurement system used by scientists. It is based on a scale that moves by multiples of 10.

Answer 2 – 10

• What is the metric system?

Question 2 - 20

• This is the metric unit of measurement for mass. We use a triple beam balance to measure these.

Answer 2 – 20

• What is a gram?

Question 2 - 30

• 71.0 kiloliters is equal to this many decaliters?

Answer 2 – 30

• What is 7,100 decaliters?

Question 2 - 40

• This unit of the metric system is used to measure the size of very small objects, such as the length of a cell. It is 1/1000 of a milimeter.

Answer 2 – 40

• What is a mircrometer (nm)?

Question 2 - 50

• These are the seven prefixes of the metric system. They are represented by KHDUDCM.

Answer 2 – 50

• What are kilo-, hecto-, deca-, base unit, deci-, centi-, mili-?

Question 3 - 10

• All atoms will have the same number of these two subatomic particles. Their positive and negative charges cancel each other out, making the atom neutral.

Answer 3 – 10

• What are protons and electrons?

Question 3 - 20

• These produces a higher number of H+ ions when in a solution. They range from 1-6 on the pH scale.

Answer 3 – 20

• What is an acid?

Question 3 - 30

• This is the attraction between a H atom and an electronegative atom, such as O. It is the bond that holds water molecules together.

Answer 3 – 30

• What are hydrogen bonds?

Question 3 - 40

• Weak acids and bases are found towards the middle of the pH scale, closest to this number. It is the pH of pure water.

Answer 3 – 40

• What is 7?

Question 3 - 50

• Our bodies need to maintain a specific range of pH all over, except here, which is much more acidic.

Answer 3 – 50

• What is the stomach?

Question 4 - 10

• Enzymes speed up chemical reactions, making them biological ones of these.

Answer 4 – 10

• What are catalysts?

Question 4 - 20

• This macromolecule is made up of a glycerol molecule and three fatty acids chains. It helps make up part of the cell membrane.

Answer 4 – 20

• What are lipids?

Question 4 - 30

• These macromolecules give us our main source of energy, even if it is only for a short period of time.

Answer 4 – 30

• What are carbohydrates?

Question 4 - 40

• Enzyme function can be effected by drastic changes in these two internal conditions.

Answer 4 – 40

• What are temperature and pH?

Question 4 - 50

• An amino acid structure contains an amino group, a carboxyl group and this, which is different for each amino acid.

Answer 4 – 50

• What is the R-group sidechain?

Question 5 - 10

• These are the two inventors of the microscope. Without them, we would have never discovered the cell.

Answer 5 – 10

• Who are Robert Hooke and Anton van Leeuwenhoek?

Question 5 - 20

• This type of microscope uses a very fine probe to view the surface of a specimen. You can see live organisms with it.

Answer 5 – 20

• What is a scanning probe microscope?

Question 5 - 30

• In plant cells, this is the outermost layer, which provides structure, support and protection.

Answer 5 – 30

• What is the cell wall?

Question 5 - 40

• These are three structures of the cell responsible for making and sending proteins where they need to go.

Answer 5 – 40

• What are the ribosomes, endoplasmic reticulum and golgi apparatus?

Question 5 - 50

• This is one characteristic of all cells. In eukaryotic cells it is found in the nucleus. In prokaryotic cells it is free floating.

Answer 5 – 50

• What is DNA?