Score: 0 / 0
Carbohydrates
Classification
-
Monosaccharides
are the simplest carbohydrates.
-
Disaccharides consist of two monosaccharides:
sucrose,
lactose, and
maltose.
-
Polysaccharides include
starch,
glycogen, and cellulose which cannot be
digested by humans.
Structure and Function
-
Aldoses
contain an aldehyde group, while
ketoses
contain a ketone group.
Dive deeper: Glucose and galactose are
aldoses, while fructose is a
ketose. Cellulose is not digestible because of its
β 1-4
glycosidic bonds, which humans lack the enzymes to break down.
α
linkages are found in starch and glycogen, making them digestible.
Reducing
sugars are monosaccharides (sugars that can donate electrons and have
immediate available energy) can be tested using
Benedict's reagent. Non-reducing sugars, such as sucrose, do not react with
Benedict's reagent
unless they are hydrolyzed into their constituent monosaccharides.
Practice Questions
Which of the following best describes non-reducing sugars? Type the letter of the answer: C
a. They can donate electrons to Benedict's reagent.
b. They are monosaccharides that can be hydrolyzed.
c. They do not react with Benedict's reagent unless hydrolyzed.
d. They are polysaccharides that can be tested with iodine.
Which type of glycosidic bond is indigestible by humans? Type the letter of the answer: A
a. β 1-4 glycosidic bond
b. α 1-4 glycosidic bond
c. α 1-6 glycosidic bond
d. β 1-6 glycosidic bond
Which sugar is matched with its correct classification? Type the letter of the answer: B
a. Fructose - Aldose
b. Glucose - Aldose
c. Galactose - Ketose
d. Sucrose - Aldose