Biology I

Carbohydrates

Biology I

Carbohydrates:

OH

OH

H

H

HO

CH2OH

HH

H

OH

O

Energy molecules

Biology I

Carbohydrates

Building block molecules =

sugar sugar sugar sugar sugar sugar sugarsugar

sugar - sugar - sugar - sugar - sugar

sugars

Biology I

sucrose

Carbohydrates Function:

quick energy energy storage structure

cell wall in plants

Examples sugars starches cellulose (cell wall)

glucoseC6H12O6

starch

Biology I

Sugars = building blocks Names for sugars usually end in

glucose fructose sucrose maltose OH

OH

H

H

HO

CH2OH

HH

H

OH

O

glucoseC6H12O6

sucrose

fructose

maltose – choc malt yum

-ose

Biology I

Building carbohydrates Synthesis

|glucose

|glucose

1 sugar = monosaccharide

2 sugars = disaccharide

|maltose

mono = onesaccharide = sugar

di = two

Biology I

Building carbohydrates Synthesis

|fructose

|glucose

1 sugar = monosaccharide

|sucrose

(table sugar)

2 sugars = disaccharide

How sweetit is!

Biology I

BIG carbohydrates Polysaccharides

large carbohydrates starch

energy storage in plants potatoes

glycogen energy storage in animals

in liver & muscles cellulose

structure in plants cell walls

chitin structure in arthropods & fungi

exoskeleton

poly = many

Biology I

Building BIG carbohydratesglucose + glucose + glucose… =

starch(plant)

glycogen(animal)

energystorage

polysaccharide

Biology I

Digesting starch vs. cellulose

starcheasy todigest

starcheasy todigest

cellulosehard todigest

cellulosehard todigest

enzyme

enzyme

Biology I

Cellulose Cell walls in plants

herbivores can digest cellulose well most carnivores cannot digest cellulose

that’s why they eat meat to get their energy & nutrients

cellulose = roughage stays undigested keeps material

moving in your intestines

Biology I

Different Diets of HerbivoresCow

can digest cellulose well; no need to eat other sugars

Gorillacan’t digest cellulose well; must add another sugar source, like fruit to diet

Biology I

Helpful bacteria How can cows digest cellulose so well?

BACTERIA live in their stomachs & help digest cellulose-rich (grass) meals

Eeeew…Chewing

cud?

Biology I

Let’s build some

Carbohydrates!

EATX

Biology I

Activities building starch by bonding together

paper glucose molecules eat carrots, celery, cookies