Organic Molecules
Please answer the remaining questions on the documents.
Benedict Region Test
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Glucose 0.05% |
Blue |
No sugar |
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Glucose 0.1% |
Green |
Traces of Reducing Sugar |
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Glucose 0.25 |
Brick Red |
Large Amounts |
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Glucose 0.5% |
Brick Red | ||
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Glucose 1% |
Orange |
Moderate Sugar |
Iodine Test
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Potato |
Blue/Black |
Contains Starch |
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Rice |
Blue/Black |
Contains Starch | ||
| Sugar |
Brown |
Doesn’t Contains Starch |
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Salt |
Lipid Test
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Bread |
Dry |
Contains No Fat |
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Nuts |
Translucent |
Contains Fat |
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Unidentifiable Liquid |
Lipids / Sudan III Test
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Egg |
Translucent Orange |
There are no Lipids |
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Vegetable Oil |
Opaque Orange |
There are Lipids |
Biuret Test
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#1 |
Purple |
Contains Protein |
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#2 |
Pink |
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#3 |
Purple |
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#4 |
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#5 |
Purple |
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#6 |
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#7 |
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#8 |
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#9 |
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#10 |
Procedure “Iodine Test” Question 5
Which substances contained starch?
Potatoes and rice
Check Your Understanding 1.3
How does Benedict’s solution react when a very high amount of reducing sugar is present in a sample?
a. Solution remains blue and no precipitate forms
b. Brick-red precipitate is formed
c. Yellow precipitate is formed
d. Yellowish-orange precipitate is formed
Procedure “Sudan Test” Question 5
Which substances interacted the most obviously with Sudan?
Procedure “Sudan Test” Question 5
Which substances did not react with Sudan?
Procedure “Biuret Test” Question 4
Which Substances were proteinaceous?
Check Your Understanding 3.1
What is a peptide bond?
Check Your Understanding 3.3
The Biuret test is used to detect the presence of a ______________. When more peptide bonds are present, the resulting color will be (darker/lighter).
Check Your Understanding 4.1
What real-world applications do you see in being able to determine an unknown substance?
Chapter Review Question 1
Define Monosaccharides, disaccharides, and polysaccharides, and provide two examples of each.
Chapter Review Question 2
What is a peptide bond? What kind of bond is it, and what monomeric units does it link together?
Chapter Review Question 3
Which of the following are true for lipids?
a.
Fats
, waxes, and phospholipids are examples
b. Lipids contain carbon, hydrogen, and oxygen in a 1:2:1 ratio
c. Lipid
s are insoluble in water and soluble in non-polar compounds such as ether.
d. All of the above
e. Both a and c.
Chapter Review Question 4
What is an essential amino acid? Name two found in humans?
Chapter Review Question 5
What is the difference between a reducing sugar and a starch?
Chapter Review Question 6
What region is used to test for the presence of each of the following, and what color does it turn when the compound is present?
a. Sugar
b. Starch
c. Lipid
d. protein
Chapter Review Question 7
The cuticle found on the surface of plant leaf is composed of waxes and a lipid known as cutin. Why is the cuticle important to the plant?
Chapter Review Question 8
What is a saturated fat? Give two examples.
Chapter Review Question 9
What is an unsaturated fat? Give two examples.
Chapter Review Question 10
Which of the two types of fat is the best choice for a healthy lifestyle and why?
Chapter Review Question 11
Match the following:
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Olive oil, canola oil, and soybean oil are examples |
Saturated fats |
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Plant cuticles and cerulean contain these |
triglycerides |
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These compounds are composed of alcohol bonded with a long-chain fatty acid. |
Fats |
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These are important for insulation and cushioning in the body |
Unsaturated fats |
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These are the most abundant lipids in living organisms |
Waxes and lipids |
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Butter, lard, coconut oil, and palm kernel oil are examples. |
Waxes |