Bio Lab Exam

Question 1

What is a discrete random variable?

Answer 1

Whole number or integer

Question 2

What is a continuous random variable?

Answer 2

Any possible number

Question 3

What is a quantitive measurement?

Answer 3

Described by numbers

Question 4

What is a qualititave measurment?

Answer 4

Described without using numbers

Question 5

What is Accuracy?

Answer 5

How close a set of measurements is to a known or true value

Question 6

What is Precision?

Answer 6

How close the measurements in a data set are to each other.

Question 7

How to calculate Percent error?

Answer 7

|experimental value- True value|
True value x 100

Question 8

What is a solution?

Answer 8

The mixture

Question 9

What is a solute?

Answer 9

A substance dissolved

Question 10

What is the solvent?

Answer 10

The liquid

Question 11

What is an aqueous solution?

Answer 11

Any solution where water is the solvent

Question 12

What is the Concentration of a solution?

Answer 12

The amount of solute per volume of solution

Question 13

What does Molarity represent?

Answer 13

The number of moles of solute per liter of solution

Question 14

What is the Formula Weight?

Answer 14

The number of grams are equivalent to one mole of the solute

Question 15

How to calculate dry solute needed?

Answer 15

g= grams/moles x moles/liters x liters

Question 16

If you have a formula weight of 158.04 g/mol, how many grams of KMnO4 would you need to make 1 L of a 2M solution?

Answer 16

316.08 grams

Question 17

If you have a formula weight of 158.04g/mol, how many grams of KMnO4 would you need to make 350 mL of a 0.75M of a solution?

Answer 17

41.49 grams

Question 18

What is a dilution?

Answer 18

Made of an existing solution to create one with a lower concentration of solute

Question 19

What are the two kinds of dilution methods?

Answer 19

Parrallel and Serial

Question 20

How to calculate a parallel dilution?

Answer 20

starting concentration x volume of starting = concentration desired x volume desired (C1V1=C2V2)

Question 21

How do you know to use a serial dilution or a parallel dilution?

Answer 21

Use a serial dilution if you are making several dilutions that share a common dilution factor, or if a single desired dillution has a much smaller concentration than the starting solution

Question 22

What is an Independent variable?

Answer 22

Things that are altered in an expierement

Question 23

What is the Dependent variable?

Answer 23

What is measured in the expierement

Question 24

Is a low PH acidic or basic?

Answer 24

Acidic

Question 25

Is a high PH acidic or basic?

Answer 25

Basic

Question 26

[H+] = 1 x 10^-3 M is what pH?

Answer 26

3

Question 27

What are the 4 things all cells have?

Answer 27

DNA, Plasma membrane, Cytosol, Ribosomes

Question 28

What is a Heterotroph?

Answer 28

Cannot make their own food, must consume food from the outside world

Question 29

What is an Autotroph?

Answer 29

Can make their own food

Question 30

What are the 3 Domains?

Answer 30

Eukarya, Bacteria, Archaea

Question 31

What are the 4 types of Eukaryotic organisms in domain Eukarya?

Answer 31

Protists, Plants, Fungi, Animals

Question 32

What is Diffusion?

Answer 32

The net movement of atoms or molecules as the result of constant random motion

Question 33

What is the Concentration Gradient?

Answer 33

Moving from high concentration to a low concentration

Question 34

What are the 3 things that effect diffusion rate?

Answer 34

Size, Temperature, The medium through which the diffusion is occuring

Question 35

How does size effect diffusion?

Answer 35

Small atoms and molecules diffuse faster than larger ones

Question 36

How does temperature effect diffusion?

Answer 36

Heat increases diffusion rate

Question 37

How does the medium effect diffusion?

Answer 37

Gas moves the fastest, Liquid moves next fastest, Sold moves the slowest

Question 38

What is Osmosis?

Answer 38

The diffusion of water across the membrane

Question 39

What is simple diffusion?

Answer 39

Diffusion that doesn't need assisstance

Question 40

What can go through simple diffusion?

Answer 40

Gases and small lipids (Small nonpolar molecules)

Question 41

What has a hard time passing through the membrane?

Answer 41

Ions, Small polar molecules, and Large molecules

Question 42

What does isotopic mean?

Answer 42

the same on both sides

Question 43

What does Hypertonic mean?

Answer 43

The outside of the cell has a higher concentration than the inside of the cell

Question 44

What does Hypotonic mean?

Answer 44

The outside of the cell has a lower concentration than the inside of the cell

Question 45

What is movement?

Answer 45

all directions all the time