Pre Lab Questions: Lab 3

Question 1

The cells in your brain are about 40.654 micrometers in diameter.

What is their diameter in nanometers?

Answer

2 points

Question 2

Think about Benedict's, Biuret's and Iodine tests.

In each case, what is the dependent variable?

Answer

A. which mystery food you are testing

B. color change

C. no choice is correct

D. the indicator reagent

2 points

Question 3

Match each INDICATOR REAGENT to the molecule it tests for

Answer

Benedict's solution

Read Answer Items for Question 3

Buiret's solution

Read Answer Items for Question 3

Iodine solution

Read Answer Items for Question 3

Sudan V solution

Read Answer Items for Question 3

Answer

A. proteins

B. starch

C. reducing sugars

D. does not match

E. fats and oils

F. non-reducing sugars

2 points

Question 4

Which tests will require BOILING WATER?

Check all that apply

Answer

Sudan V

Iodine

Buiret's

Benedict's

2 points

Question 5

Any substance that would make the test come out negative can be used as a negative control.

Which would be an appropriate negative control for the Biruet test?

Check all that apply.

Answer

glucose

lard

water

starch

2 points

Question 6

Match each INDICATOR REAGENT to the color change you will see (if the test is positive)

Answer

Benedict's solution

Read Answer Items for Question 6

Buiret's solution

Read Answer Items for Question 6

Iodine solution

Read Answer Items for Question 6

Sudan V solution

Read Answer Items for Question 6

Answer

A. clear --------> red, green or yellow

B. clear --------> blue

C. orange-brown --------> red

D. none of these

E. blue --------> purple

F. orange-brown --------> blue-black

G. blue --------> red, green or yellow

2 points

Question 7

Which tests will require plastic tubes?

Check all that apply...