Multiple Choice - Choose the letter of the best answer.
1. Which of the following is not an organic molecule?
a. cellulose
b. sucrose
c. water
d. testosterone
2. Which of the following terms includes all the other terms on this list?
a. polysaccharide
b. carbohydrate
c. monosaccharide
d. glycogen
3. Which term is most appropriate to describe a molecule that dissolves easily in water?
a. hydrocarbon
b. hydrophobic
c. hydrophilic
d. organic
4. Cholesterol is an example of what kind of molecule?
a. protein
b. lipid
c. amino acid
d. carbohydrate
5. The 20 amino acids vary only in their
a. carboxyl goups.
b. side groups.
c. amino groups.
d. lipid groups.
6. A specific reactant an enzyme acts upon is called the
a. catalyst.
b. sucrase.
c. active site.
d. substrate.
7. An enzyme does which of the following?
a. adds heat to a reaction, speeding it up
b. lowers the activation energy of a reaction
c. cools a reaction, slowing it down
d. raises the activation energy of a reaction
Short Answer
8. Besides satisfying your hunger, why else might you consume a big bowl of pasta the night before a race?
Besides satisfying my hunger, I might consume a big bowl of pasta the night before a race so I could take in some carbohydrates for energy.
9. How are glucose, sucrose, and starch related?
Glucose, sucrose, and starch are related because they are all carbohydrate. Also, they are all in plant because starch is made up of glucose monomers. The sucrose are also in the plant sap and it nourishes all the parts of plant.
10. What are steroids? Describe two functions they have in cells.
Steroids are lipid molecule in which the carbon skeleton forms four fused rings. Ateroids circle around our body as chemical signals. They also make the women and men's hormone.
11. How are polypeptides related to proteins?
Polypeptides are related to proteins because proteins are created by one or more polypeptides.
12. How does denaturation affect the ability of a protein to function?
Denaturation affect the ability of a protein to function because the change in enviornment could cause the protein to unravel and lose its normal shape. When shape changes, the protein loses their ability to function.
Applying Concepts
Analyzing Information
14. Analyzing Diagrams The reaction below shows two amino acids joining together.
a. One product of this reaction is represented by a question mark. Which molecule is it?
The molecule that is represented by a question mark is H2O, water.
b. What is this kind of reaction called? Explain.
This kind of reaction is called the dehydration reaction. Amino acids has no element that is not stable. Which means they don't need to share an electron anymore. Though, able for the amino acids to bond together, they need to give up 2 hydrogen atoms and one oxygen atom. Then, the water is produced.
c. If an amino acid were added to this chain, at what two places could it attach?
If an amino acid were added to this chain, the two places that could be attached to will be the place where there is HO or H. So, for example, the far right hand sides of the Serine or far left hand side of Leucine.
15. Analyzing Graphs Use the graph to answer the questions below.
a. At which temperature does enzyme A perform best? Enzyme B?
At 37°C the enzyme A perform best and at 77°C the enzyme B perform best.
b. Knowing that one of these enzymes is found in humans and the other in thermophilic (heat-loving) bacteria, hypothesize which enzyme came from which organism.
The enzyme A is from humans and enzyme B is from thermophilic bacteria.
c. Propose a hypothesis that explains why the rate of the reaction catalyzed by enzyme A slows down at temperatures above 40°C.
If the rate of the reaction catalzed by enzyme A slows down at temperatures above 40°C, then the reaction is coming to the end.
No comments:
Post a Comment