Chemistry Of Life Quiz 4
This quiz will help you assess your understanding of the concepts and vocabulary in the MCPS biology unit: chemistry of life.
- 1.A drop of iodine is placed in a test tube containing a sample of an unknown solution. The solution turns blue-black. This indicates that the unknown contains _________.
- A.
Glucose
- B.
Lipid
- C.
Starch
- D.
Protein
- 2.Several drops of iodine is placed in a test tube containing pure water. We would expect that the color of the water would become __________.
- A.
Blue-black
- B.
Yellow-brown
- C.
Green
- 3.Mr. Kissal has a bottle containing a clear, colorless, odorless liquid. He says he thinks it is pure water. You remove a small sample, place it into a test tube, and add several drops of iodine. The color of the liquid in the test tube becomes blue black. What will you tell Mr. Kissal?
- A.
The water is not pure. It definitely has some starch in it.
- B.
Water is a starch.
- C.
The water is pure and contains no contaminants of any kind.
- 4.Mr. Kissal has a bottle containing a clear, colorless, odorless liquid. He says he thinks it is pure water. You remove a small sample, place it into a test tube, and add several drops of iodine. The color of the liquid in the test tube becomes brown-yellow. What will you tell Mr. Kissal?
- A.
The water is not pure. It definitely has some starch in it.
- B.
The water is pure with no contaminants of any kind.
- C.
The water does not contain starch, but it may contain other contaminants that have not been tested for.
- 5.Ms. Puckett placed a thin slice of potato on a microscope slide. She adds one drop of iodine. Under the microscope, Ms. P. should expect to see _______________.
- A.
Cells that are mostly white in color because potatoes are mostly white.
- B.
Cells that are very yellow in color because the iodine stained them and iodine is yellow-brown in color.
- C.
Cells that have large areas of blue-black color because a potato contains the carbohydrate polymer known as starch.
- 6.A piece of potato is rubbed on a small sheet of brown paper. What would you expect to see?
- A.
A stained area that allows light to shine through the paper.
- B.
A stained area that does NOT allow light to pass through the paper.
- C.
No change at all on the paper.
- 7.Which of the following is NOT considered to be a carbohydrate?
- A.
Table sugar
- B.
Cellulose
- C.
Butter
- D.
Fructose
- 8.Water is used as a control in experiments to test for the presence of various organic compounds. The reason for this is that ________________.
- A.
Water is inexpensive and therefore it is easy to use
- B.
Water is an excellent solvent and soak up all of the chemicals that are used.
- C.
Water is NOT an organic molecule and therefore it is good to use for comparison.
- 9.When you are performing tests for organic compounds, you should use _____________ for eye protection.
- A.
Your hands shielding your eyes
- B.
Glasses if you wear them
- C.
Goggles
- D.
No special equipment
- 10.DNA and RNA are examples of __________.
- A.
Polysaccharides
- B.
Amino acids
- C.
Proteins
- D.
Nucleic acids
- 11.A drop of vegetable oil is placed on a small piece of brown paper. You would expect to see which of the following?
- A.
A small drop that does not soak into the paper because oil molecules are very cohesive with high surface tension.
- B.
A wet spot that does not allow light to pass through.
- C.
A spot that is translucent, i.e. it allows light to shine through it.
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