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bio lab > midterm > Flashcards

midterm Flashcards

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Biology 101 flashcards
1
Q

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

A

to dry your hands just after throughly scrubbing and rinsing them

to turn off the faucet

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2
Q

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

A

Bio-safety

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3
Q

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

A

prior to the lab activity

after the completion of the lab activities

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4
Q

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

A

systematic

reproducible

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5
Q

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

A

speed

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6
Q

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

A

speed

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7
Q

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

A

introduction, procedures, results

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8
Q

14 millimeters corresponds to __ centimeters.

A

1.4

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9
Q

58.6 centimeters corresponds to __ millimeters.

A

586

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10
Q

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

A

2

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11
Q

1 cup corresponds to approximately __ mL.

A

240

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12
Q

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

A

focus knob, stage, nose piece

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13
Q

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

A

false

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14
Q

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

A

centrioles

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15
Q

__ is used to detect the presence of starch.

A

Iodine

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16
Q

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

A

constructing membranes

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17
Q

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

A

Purple

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18
Q

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

A

AMYLASE

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19
Q

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

A

length

20
Q

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

A

black

21
Q

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

A

phosphates

22
Q

Plants store glucose as __.

A

starch

23
Q

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

A

red

24
Q

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

A

catalase samples are either heated or cooled

25
Q

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

A

increase

26
Q

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

A

the concentration of substrate is limiting the rate

27
Q

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

A

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

28
Q

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.

A

false

29
Q

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

A

the bubbles will no longer be formed

the bubbles will burst

the tubes will all have the same height bubbles

30
Q

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

A

bunsun burner

31
Q

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

A

graph the results

make calculations based on the raw measurements

judge whether the hypothesis is supported by the results

32
Q

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

A

speed

33
Q

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

A

braking distance

34
Q

How many cubic centimeters is 1 milliliter?

A

1

35
Q

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

A

The specimen can be viewed as living cells

the motility of a specimen can be viewed under the microscope

36
Q

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

A

water

37
Q

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

A

they can be for signaling

they act as catalysts

they can play a role in the immune system

they can be structural

38
Q

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.

A

how much water is produced

how much hydrogen peroxide is used

how much oxygen is produced

39
Q

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.

A

false

40
Q

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

A

the concentration of substrate is limiting the rate

41
Q

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

A

on the Material Safety Data Sheet

42
Q

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?

A

filter paper moistened with vinegar

43
Q

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

A

hypothesis, experiment

44
Q

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

A

resolving power
contrast
magnification

45
Q

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

A

construction of membranes

storage of energy

46
Q

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

A

true

bio lab (2 decks)

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