Online Homework 6-Carbohydrates-BIOL-107

Online Homework 6-Carbohydrates-BIOL-107

Online Homework 6-Carbohydrates

Question 1
Is the molecule C20H40O2 a carbohydrate or a lipid?

lipid
carbohydrate

Question 2
How many carbons do hexose sugars contain?

4
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
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

Online Homework 6-Carbohydrates-BIOL-107

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