Your “Do Now” 4/11

• Grab a paper from up front

• Read through the first part

• Answer the first 2 questions

• Be ready to share

Agenda 4/11

• Turn in Circle Map & Exploring Energy & Matter paper (1st Day)

• Notes #2

• Revisit intro

• Practice problems

Ch 8 Notes #2 Macromolecules

Learning Target

2) I can explain the importance of carbohydrates, lipids, proteins, and nucleic acids and what foods we eat to get them

The parts of living things

• Life on earth is carbon based because all living things have carbon in them.

Some key vocab termsSome key vocab terms

Monomer Monomer

Polymer Polymer

MacromoleculeMacromolecule

CarbohydratesCarbohydrates

ProteinsProteins

LipidsLipids

Monomer: one small molecule

Analogy: one LEGO brick

Polymer: several monomers joined together

Analogy: chain of LEGOs

Some analogiesSome analogiesEXAMPLE of POLYMER

MONOMER

A TRAIN ?

A NECKLACE ?

MacromoleculeA large molecule made of many

smaller parts

What do these words mean?

1. Proteins2. Lipids (fats)3. Carbohydrates4. Nucleic acids (DNA/RNA)

Three out of the 4 types of biochemical macromolecules

can be found on food nutrition labels…

Look at the label to the left. 3 of the 4 macromolecules can

be found in foods.

1____________________

2____________________

3____________________

(0 grams in this product)

(13 grams in this product)

(9 grams in this product)

The 4th type is not found on food labels

•Two types: DNA and RNA

•Nucleic acids made up of nucleotides (sugar, phosphate, base)

•Cells make nucleic acids using foods we eat

NUCLEIC ACIDS

Getting energy from foodOur digestive system breaks foods down to

1) Make energy and molecules that store energy

2) Making molecules that can be used by our body

Look at the foods in your cup!

• Our first macromolecules are proteins

• Which foods do you think are high in proteins?

PROTEINSImportance of proteins:

1.Provide structure for body parts

2.A source of energy

3.Part of the cell membrane

4.Oxygen transport (hemoglobin)

5.Enzymes: special type of protein that helps speed-up reactions.

Muscles, ligaments,

tendons, and bones

PROTEINS

Hair, Skin, and NailsPROTEINS

PROTEINS

Proteins are made of chains of Proteins are made of chains of amino acidsamino acids (polypeptides)(polypeptides)

 

If you didn’t have enzymes in your stomach to speed up digestion, the food would rot in

your stomach because it would take so long!

PROTEINS

Foods that are high in proteinsChicken /

turkey

Nuts Eggs

Red meat Fish

Dairy

Beans

LIPIDS (fats)

1. Supply long-term energy (stored in body for later use)

2. Make up part of the cell membrane (let things in & out of cell)

3. Provide insulation (keep organisms warm)

LIPIDS

•Lipids are made of two parts: Lipids are made of two parts: fatty acids fatty acids and and glycerolglycerol

LIPIDS from foods

• Take another look in your cup

• Carbohydrates are up next

• Which foods do you think have a lot of “carbs”

CARBOHYDRATES1. Main source of short-term energy for our

bodies

2. Carbohydrates are made of units of sugar

3. Found in almost everything you eat

4. More readily useable than lipids and proteins

5. Get into blood stream quickly

Glucose, sucrose (table sugar)

Simple CARBOHYDRATES

Simple Carbs.

Complex CarbohydratesExample: Example: Starch (not broken Starch (not broken down as easily)down as easily)

Complex CARBS-- Food examples

• Body stores extra carbs in the body as fats (glycogen)

Energy from foods is measured in Calories.

Example: If you drink a glass of skim milk, you will get a gain of 90 Calories of energy for your body.

Which type will be highest in calories?

A. Proteins

B. Carbs

C. Lipids

PROTEINS: 1 gram protein = 4 Calories.

Energy Gained From Carbohydrates

CARBS: 1g carbohydrates = 4 Calories.

LIPIDS

1 g = 9 Calories.

Notice if you eat 1 gram of fat, you are gaining more than twice the amount of

Calories than from a gram of carbohydrate or protein!

Food is a mix of all three

ENERGY So…So…

BIG 4 MACROMOLECULES

Number of Calories it provides

Carbohydrates 4

Proteins 4

Lipids 9

Nucleic Acids 0

Practice

LIPIDS…Some interesting info

•Fruits produce a waxy coating to keep from drying out.

• The cells in a tulip make a wax which helps coat the leaves.

•Ear wax traps dust, sand, and other foreign particles from going deeper into the ear and causing damage.

•Beeswax- a structural material to hold honey in the hive

LIPIPS…Some interesting info

There are many different types of There are many different types of steroids. They are all lipids. Their steroids. They are all lipids. Their functions vary. Some common functions vary. Some common steroids are:steroids are:

SEX STEROIDSSEX STEROIDS ANABOLIC ANABOLIC STERIODSSTERIODS

Like testosterone Like testosterone and estrogenand estrogen

They increase They increase musclemuscle