midterm

Question 1

What is a towel used for in the hand washing process? Select all that apply

Answer 1

to dry your hands just after throughly scrubbing and rinsing them

to turn off the faucet

Question 2

Infectious agents in the laboratory are classified into four __ levels based on their ease of transmission and ability to cause disease.

Answer 2

Bio-safety

Question 3

When should the lab bench be cleaned and disinfected? Check all that apply.

Answer 3

prior to the lab activity

after the completion of the lab activities

Question 4

Scientific results that have undergone tests are (select all that apply)

Answer 4

systematic

reproducible

Question 5

Suppose your hypothesis is “braking distance grows linearly with speed”. What is the independent variable?

Answer 5

speed

Question 6

Suppose your hypothesis is “The braking distance grows linearly with speed”. Which factor will you vary in order to test the hypothesis?

Answer 6

speed

Question 7

Which topics belong in a scientific paper? Select all that apply.

Answer 7

introduction, procedures, results

Question 8

14 millimeters corresponds to __ centimeters.

Answer 8

1.4

Question 9

58.6 centimeters corresponds to __ millimeters.

Answer 9

586

Question 10

Approximately how many quarts of soda are in a 2 liter bottle?

Answer 10

2

Question 11

1 cup corresponds to approximately __ mL.

Answer 11

240

Question 12

What parts of the microscope move? Select all that apply.

Answer 12

focus knob, stage, nose piece

Question 13

Due to their small size, all plant and animal cells must be visualized using electron microscopy.

Answer 13

false

Question 14

Which of the following structures is present in animal cells but not plant cells?

Answer 14

centrioles

Question 15

__ is used to detect the presence of starch.

Answer 15

Iodine

Question 16

In addition to storing carbon and energy, what else are lipids used for in cells?

Answer 16

constructing membranes

Question 17

A positive reaction for the presence of protein using the Biuret test would be __ in color.

Answer 17

Purple

Question 18

In the starch composition experiment, the enzyme pancreatic __ was used to hydrolyse starch to glucose.

Answer 18

AMYLASE

Question 19

Which of the following is the major difference between proteins, polypeptides and peptides?

Answer 19

length

Question 20

A positive reaction for the iodine test for starch is indicated by a(n) __ color.

Answer 20

black

Question 21

Phospholipids have a similar structure to fats except they contain a __ group in place of the thrid fatty acid.

Answer 21

phosphates

Question 22

Plants store glucose as __.

Answer 22

starch

Question 23

Which of the following colors indicates a positive reaction for the presence of reducing sugar using Benedict’s test?

Answer 23

red

Question 24

In the enzyme experiment, how was the temperature of the catalase reaction controlled?

Answer 24

catalase samples are either heated or cooled

Question 25

An enzyme reduces the energy necessary to start a chemical reaction. This means that the rate of the reaction will __.

Answer 25

increase

Question 26

Increasing the concentration of hydrogen peroxide will increase the reaction rate of catalase if which of the following is true?

Answer 26

the concentration of substrate is limiting the rate

Question 27

Which of the following unexpected results could occur if you used the catalase before it had a chance to reach your experimental temperature?

Answer 27

in the experiment with the cooled enzyme, you would get a higher bubble column that expected in the experiment with the over heated enzyme, you would get a higher bubble column than expected

Question 28

An enzyme at its optimum pH will produce a column of bubbles that is higher than when it is not at its optimum pH because it is less active.

Answer 28

false

Question 29

In the enzyme experiment, what will happen if the test tubes are left an hour instead of 20 seconds? Select all that apply.

Answer 29

the bubbles will no longer be formed the bubbles will burst the tubes will all have the same height bubbles

Question 30

During which of the following lab activities is it most important to tie back long hair?

Answer 30

bunsun burner

Question 31

What do you do during an analysis phase? Select all that apply.

Answer 31

graph the results make calculations based on the raw measurements judge whether the hypothesis is supported by the results

Question 32

The hypothesis is "the braking distance grows linearly with speed". What should be on the x axis on the graph?

Answer 32

speed

Question 33

The hypothesis is "the braking distance grows linearly with speed". What should be on the y axis on the graph?

Answer 33

braking distance

Question 34

How many cubic centimeters is 1 milliliter?

Answer 34

1

Question 35

What are the advantages of using a wet mount? Select all that apply.

Answer 35

The specimen can be viewed as living cells the motility of a specimen can be viewed under the microscope

Question 36

In the chemical composition experiment, the negative control tube contained __.

Answer 36

water

Question 37

Which of the following are functions of proteins? Select all that apply.

Answer 37

they can be for signaling they act as catalysts they can play a role in the immune system they can be structural

Question 38

Hydrogen peroxide is broken down to produce water and oxygen with the help of the enzyme catalase. Which of the following can be measured to determine the enzymatic activity? Select all that apply.

Answer 38

how much water is produced how much hydrogen peroxide is used how much oxygen is produced

Question 39

An enzyme at its optimum pH will produce a column of bubbles that is higher than when it is not at its optimum pH because it is less active.

Answer 39

false

Question 40

Increasing the concentration of hydrogen peroxide will increase the reaction rate of catalase if which of the following is true?

Answer 40

the concentration of substrate is limiting the rate

Question 41

Information about hazards posed by chemicals used in the lab can consistently be found

Answer 41

on the Material Safety Data Sheet

Question 42

You decide to test your pillbugs' preference for an acidic environment versus a non-acidic environment. On one side of the chamber you place filter paper moistened with water. What is the appropriate to place on the other side to test this variable?

Answer 42

filter paper moistened with vinegar

Question 43

Which of the following are phases in LearnSmart Labs' 4-phase model of the scientific method? Select all that apply

Answer 43

hypothesis, experiment

Question 44

Which of the following determines the quality and clarity of the microscope image? Select all that apply.

Answer 44

resolving power contrast magnification

Question 45

The functions of lipids include which of the following? Select all that apply.

Answer 45

construction of membranes storage of energy

Question 46

During the formation of a peptide bond, a molecule of water is removed by a dehydration reaction.

Answer 46

true