Biology Lab exam 1

You are given an unknown substance and asked to test for the presence of simple sugars. Which of the following would be a good positive control for this experiment? A. 10% fructose solution B. Pure water

A. 10% fructose solution

Why is it important to have a control group within your experiment? A. All of the above B. To avoid false negatives C. To check for other factors that might play a role in the results D. To avoid false positives

A. All of the above

What solution will be a positive control for Benedict's test? A. Glucose solution B. starch solution C. vegetable oil D. Albumin

A. Glucose solution

Glucose is a: A. Simple sugar B. Complex sugar C. Disaccharide D. Polysaccharide

A. Simple sugar

In the process of dehydration synthesis (also known as condensation reaction), when two glucose molecules come together to form a bond between them ___________ is a by-product. A. O2 B. H2O C. No answer text provided. D. CO2

B. H2O

You are given an unknown substance and asked to test for the presence of simple sugars. Which of the following would be a good negative control for this experiment? A. 10% fructose solution B. Pure water

B. Pure water

What solution will be a positive control for the Iodine test? A. Glucose solution B. starch solution C. vegetable oil D. Albumin

B. Starch solution

10 drops of Benedict's solution was added to 10 drops of vegetable oil. After applying heat to the Benedict's solution and vegetable oil mixture (for 2 minutes), which of the following would be the expected result? A. The Benedict's solution will turn bright red, since a reaction will occur B.The Benedict's solution will remain light blue, since no reaction will occur C. The Benedict's solution will turn dark orange, since a reaction will occur D. No answer text provided.

B.The Benedict's solution will remain light blue, since no reaction will occur

A positive control is a test which will yield a positive result. We use positive controls in experiments to define and determine what a standard positive result should be. For instance, when testing an unknown sample for simple sugars (using the Benedict's test), we can use a known concentration of glucose as our positive control. Since we know that glucose is a simple sugar and will yield a positive result. A positive control also helps us prevents false negative results in our experiments. A negative control is a test which will yield a negative result. We use negative controls in experiments to define and determine what a standard negative result should be. For instance, when testing an unknown sample for simple sugars (using the Benedict's test), we can use pure water as our negative control. Since we know that pure water is just H2O and will yield a negative result. A negative control also helps us prevents false positive results in our experiments. Which of the following can be used as a positive control for the Biuret's test? A. Glucose solution B. Vegetable oil C. Albumin (which is high in proteins) D. Glycine (an amino acid) solution E. Starch solution

C. Albumin (which is high in proteins)

What solution will be a positive control for the Sudan IV test? A. Glucose solution B. starch solution C. vegetable oil D. Albumin

C. Vegetable oil

What solution will be a positive control for the Biuret's test? A. Glucose solution B. starch solution C. vegetable oil D. Albumin

D. Albumin

Proteins are polymers, made of individual monomers called __________. A. H2O B. Nucleic acids C. Glucose D. Amino acids

D. Amino acids

Honey is ~80% carbohydrates, predominantly in the form of fructose and glucose. Which of the following statements could be considered true for honey? A. Honey does not contain any simple sugars B. Honey would yield a negative result for the Benedict's test C. Honey could be used as a negative control for the Benedict's test D. Honey would yield a positive result for the Benedict's test

D. Honey would yield a positive result for the Benedict's test because honey has simple sugars

Which of the following could be used as a positive control for the Sudan IV test? A. H2O B. Vegetable oil C. 10% starch solution D. 10% maltose solution E. 1% of albumin solution F. 1% glycine solution

b. Vegetable oil