Online Homework 6-Carbohydrates-BIOL-107
Online Homework 6-Carbohydrates
Question 1
Is the molecule C20H40O2 a carbohydrate or a lipid?
lipid
carbohydrate
carbohydrate
Question 2
How many carbons do hexose sugars contain?
4
6
6
5
7
3
Question 3
Why do carbohydrates dissolve in water?
They contain several polar covalent bonds
They are held together with ionic bonds
They don’t. Carbohydrates are hydrophobic.
Question 4
Match
This is the sugar component of deoxyribonucleic acid, the hereditary molecule.
This is the monosaccharide that is combined with glucose to become lactose, milk sugar.
This is a monosaccharide made by plants; when combined with glucose, sucrose results.
This is the polysaccharide found in the cell walls of plants. It cannot be digested by mammals, but bacteria living in the rumens of cows, sheep, goats, etc, break it down for them.
This disaccharide is formed when starches are digested by enzymes
The monosaccharide found in the blood and most useful to cells for immediate energy. The brain needs this to function.
The monosaccharide found in ribonucleic acid, RNA.
The disaccharide found in milk; some people lack the enzyme to digest this.
The polysaccharide that stores energy in plants; it is commonly found in pasta and bread (from wheat seeds), and potatoes.
Question 5
Which of these are monosaccharides? (choose all that apply)
glycogen
chitin
deoxyribose
galactose
cellulose
glucose
Question 6
Are ribose and deoxyribose isomers?
yes
no
no
Question 7
Which of these are disaccharides? (choose all that apply)
starch
chitin
maltose
lactose
cellulose
Question 8
Which of these are polysaccharides? (choose all that apply)
fructose
galactose
deoxyribose
cellulose
chitin
Question 9
In which part of your body will you likely store glycogen?
liver and muscles
brain and blood
fat tissue
small and large intestine
kidneys and hair
Question 10
Which of the following have chitin shells?
clams
turkeys
earthworms
grasshoppers
lobsters
shrimp
scallops
Question 11
Cows, sheep, goats, deer, etc., are cud chewers; they can derive nutritional value from high cellulose foods while we cannot. Why?
Those animals contain special enzymes that perform the necessary dehydration synthesis reactions in their digestive tracts to turn the cellulose into the necessary protein so they can provide meat.
Those animals (ruminants) have bacteria living within their digestive system that use hydrolysis reactions to digests cellulose to glucose for them.
Question 12
Starch is broken into individual glucose molecules using a reaction called ____________________.
dehydration synthesis
hydrolysis
hydrolysis
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