CHEM 2701/2703 – Final Take-Home Assignment

CHEM 2701/2703 – Final Take-Home Assignment (15% Final Evaluation)
Pre-Health Chemistry II – Durham College /45 marks
1) (10 marks) Using the information from the above reading, categorize the following as either:
(1) A source of energy
(2) An amino acid
(3) A stimulant
(4) A vitamin
(5) An artificial sweetener
(6) A preservative
(7) Related to metabolism
NB: Numbers can be used more than once or not at all
Biomolecules
of the products
sucrose citric acid taurine aspartame glutamine
Category #
from above
1. A source of
energy
7.Related
to
metabolism
3.A stimulant 5.An artificial
sweetener
2.An amino
acid
Biomolecules
of the products
potassium
sorbate
fructose caffeine sucralose folic acid
Category #
from above
6.A preservative 1.A source
of energy
3.A stimulant 5.An artificial
sweetener
7.Related to
metabolism
2: Lactose Intolerance (enzymes)
1. (5 marks) Number match the parts of an enzyme and substrate. More than one letter may
apply.
○ 1=enzyme A,C,E_____
○ 2=substrate _D, D____
○ 3=active site _A, E____
○ 4=enzyme-substrate complex __C,D___
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○ 5=product _F, G____
2. (2 marks) Instead of drinking lactose free milk someone might take lactase tablets. Do you think
this would work? Explain why/how?
Yes, the lactase tablets help to break down the lactose in milk therefore the people can take the milk
with lactose and then take lactase pills instead of the lactose free milk.
3. (2 marks) What is the difference between lactose and lactase? 2 differences needed for full marks.
Lactose is a carbohydrate polymer which has two smaller sugars while lactase is an enzymatic
protein. Also, lactose is a disaccharide sugar, which is made up of one molecule of galactose and one
molecule of glucose while lactase is able to generate two monosaccharide molecule.
4. (2 marks) Identify 2 factors that can affect enzyme activity.
The concentration of the enzymes, temperature and substrate concentration
3: Olestra (lipids)
1. (2 marks) Describe the structure of a triglyceride.
Triglyceride is made of a glycerol and 3-fatty acid chains.
2. Olestra is a synthetic fat that was discovered in the 1990's. It was popular at the time because it
had the taste and texture of a real fat but did not cause weight gain. Olestra is also known as olean.
Research olestra/olean at the following links:
● https://onlinelibrary.wiley.com/doi/pdf/10.1002/clc.4960190508
● https://en.wikipedia.org/wiki/Olestra
a) (1 mark) Why was olestra/olean banned?
Olestra/olean was banned due to its gaining up of weight due to the fake fat available, which includes
diarrhea, cramps, and leaky bowel syndrome
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