Midterm

Question 1

In which situation is it most important that long hair be tied back in the lab?

Answer 1

When working with a bunsen burner

Question 2

Where should glass slides, pipettes, and capillary tubes be disposed?

Answer 2

Sharps Container

Question 3

Which of the following units is the greatest?

• Meter
• Centimeter
• Decimeter
• Millimeter

Answer 3

Meter

Question 4

Normal room temperature is 77 degrees Fahrenheit. What is normal room temperature in Celsius?

Answer 4

25

Question 5

To convert a larger unit of measure to a smaller one you would ________ a factor.

Answer 5

multiply by

Question 6

Select the unit of weight that is the heaviest.

• 1 kilogram
• 1 gram
• 1 pound

Answer 6

1 kilogram

Question 7

1.000,000 millimeters is equal to ________ kilometers.

Answer 7

1

Question 8

How many yards does 1 meter roughly correspond to?

Answer 8

1

Question 9

How many grams are in 1000 milligrams?

Answer 9

1

Question 10

In the metric system what is the meaning of “milli”?

Answer 10

1/10

Question 11

How many centimeters are in a meter?

Answer 11

100

Question 12

The meniscus is

Answer 12

the lowest margin of water level.

Question 13

The lenses of a bright field microscope are responsible of the _______ of the object you are viewing.

Answer 13

magnification

Question 14

The mechanical stage lower knob causes the stage to move

Answer 14

right to left.

Question 15

Biuret reagent contains ________ ions which react with peptide bonds under the alkaline collisions of the reagent and produce the color change associated with the presence of protein.

Answer 15

copper

Question 16

Which of the following reagents is best suited for the detection of starch?

Answer 16

Benidict’s

Question 17

Starch is a(n):

• disaccharide
• monosaccharide
• polysaccharide

Answer 17

polysaccharide

Question 18

Which of the following tests requires heating prior to observing the results?

Answer 18

Benedict’s test

Question 19

The positive control for the iodine test was the _________

Answer 19

starch solution.

Question 20

Which reagent is used to detect the presence of protein?

Answer 20

Biuret reagent

Question 21

Which reagent is used to detect the of starch?

Answer 21

Iodine Solution

Question 22

Which of the following reagents is best suited for the detection of sugar?

Answer 22

Benedict’s

Question 23

Which of the following reagents is best suited for the detection of proteins?

Answer 23

Biuret

Question 24

The Benedict’s test indicates a positive result when the solution turns

yellow

green

All choices are correct

red.

Answer 24

All choices are correct

Question 25

Which reagent is sued to detect the presence of simple sugars?

Answer 25

Benedict’s

Question 26

Imagine that you are observing an enzyme-catalyzed reaction in lab. Every time you add more enzyme, the reaction rate increases proportionally until the reaction rate suddenly levels off. No other chemicals were added, and no modifications were made in the experimental setting. Why do you think the reaction rate stopped increasing?

Answer 26

The molecules of substrate were all bound to enzyme.

Question 27

Altering the three-dimensional structure of an enzyme might

Answer 27

prevent the substrate from binding the enzyme’s active site.

Question 28

In a catalase-controlled experiment, the negative control can be shown by

Answer 28

a mixture of hydrogen peroxide and water.

Question 29

The primary function of an enzyme or any biological catalyst is to

Answer 29

reduce the energy of activation and increase the rate of a reaction.

Question 30

How does the concentration of the substrate in an enzyme-controlled chemical reaction change over time?

Answer 30

The substrate concentration will decrease.