Four types of organic molecules
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Four Types of Organic Molecules. Made by cells Contains carbon. Importance of Carbon. Although cells are 70-95% water, the rest of composed mainly of carbon compounds. Proteins, carbohydrates, DNA, and other molecules are compounds of carbon bonded to other elements.

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Four Types of Organic Molecules

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Four types of organic molecules

Four Types ofOrganic Molecules

Made by cells

Contains carbon

Importance of carbon

Importance of Carbon

  • Although cells are 70-95% water, the rest of composed mainly of carbon compounds.

  • Proteins, carbohydrates, DNA, and other molecules are compounds of carbon bonded to other elements.

  • Carbon often bonds to H, O, N, S, and P in organic compounds.

Properties of carbon

Properties of Carbon

  • Has four valence electrons; can form covalent bonds with four other atoms (tetravalence)

  • Carbon bonded to four atoms forms a tetrahedron-shaped molecule.

  • Carbon can form single, double, or triple bonds with other atoms.

Four types of organic molecules

  • Carbon chains form the backbone of most organic molecules.

  • Chains can be straight, branched, or arranged in closed rings.

  • Hydrocarbons contain carbon and hydrogen only, and are hydrophobic. H—C and C—C bonds are nonpolar.

  • Hydrocarbons make up fossil fuels, and parts of cellular organic molecules such as fats and phospholipids.

Four types of organic molecules

1. Carbohydrates- used as fuel and building material

2. Lipids-energy storage

3. Proteins-structure, movement, enzymes

4. Nucleic acids-store and transmit hereditary information.

All four are macromolecules because of their large size

The largest


are called polymers

Created by linking

smaller subunits

called monomers.

All four are macromolecules because of their large size.



  • Monomers are linked together to form polymers through dehydration reactions, which remove water

  • Monomers are linked together by covalent bonds



Short polymer



Longer polymer



  • Polymers are broken apart by hydrolysis, the addition of water

  • Breaks covalent bonds between monomers


Review q

Review Q:

Hydrolysis is involved in which of the following?

Formation of starch

Hydrogen bond formation between amino acids

Peptide bonds in proteins

The hydrophobic interactions in lipids

The digestion of maltose to glucose

1 carbohydrates


monosaccharides - one ring sugars

glucose, galactose and fructose

* A 6-carbon sugar

* Found in peas.

* A 5-carbon sugar

* A 6-carbon sugar

* the sugar that sweetens fruit

* The sugar in our blood



  • Disease characterized by high levels of blood glucose resulting from defects in insulin production

  • Monitored with blood glucose device.

Four types of organic molecules

disaccharides - two monosaccharides (2 ring sugar)

Glucose + fructose = Sucrose (table sugar)

Glucose + galactose = Lactose (milk sugar)

Glucose + glucose = Maltose (malt sugar)

Lactose intolerant

Lactose intolerant

If the enzyme lactase is not present, the body is unable to break down lactose. Allowing it to reach the large intestines. Normally, sugars do not reach the large intestine. This is what causes a stomach ache!

Four types of organic molecules

  • polysaccharides - long chains of repeating units of monosaccharides, these are energy storing molecules or structural molecules


    • starch (plants produce for a storage molecule.)

    • glycogen (storage molecule in muscle and liver cells.)


    • chitin (used by insects and crustaceans to build an


    • cellulose (plants produce for cell wall construction.)

      • indigestible because we lack enzymes to break it down.

Starch cellulose glycogen

Starch, Cellulose & Glycogen

All the sugars are oriented in the same direction

Branched or "forked"

Every other sugar molecule is "upside-down

Review q1

Review Q:

Polymers of carbohydrates are all synthesized from monomers by

the joining of disaccharides.


dehydration synthesis.

ionic bonding between monomers


2 protein made of a long chain of amino acids make up 50 of cellular dry weight

2.ProteinMade ofa long chain of amino acidsMake up 50% of cellular dry weight

Amino acids building blocks

Amino acids (building blocks)

  • Have an amino group and a carboxyl group

  • Also a chemical group symbolized by R





Four types of organic molecules

  • Dehydration reaction links the carboxyl group of one amino acid to the amino group of the next amino acid

    • The covalent linkage resulting is called a peptide bond










Amino acid

Amino acid

Proteins function as

Proteins function as…

  • Support

    • keratin for hair and nails & collagen for ligaments, tendons, skin

Proteins function as1

Proteins function as…

  • Enzymes to speed up reactions

  • Example: Amylase is an enzyme in saliva that breaks starch into glucose monomers.


Saliva Identification - Amylase

Proteins function as2

Proteins function as…

  • Transport across cell membranes

    • Hemoglobin

  • Defense from infection

    • Antibodies

  • Hormones

    • Insulin

Insulin is a hormone that helps your body use glucose.

Protein structure is key to their ability to function

Proteinstructure is key to their ability to function.

**A protein can be denatured, heat causes it to lose its shape, and its functionality..

Review q2

Review Q:

The linkage between the monomers of proteins are identified as

Peptide bonds

Glycosidic linkages

Ionic bonds

Covalent bonds

Ester linkages

Review q3

Review Q:

Which two functional groups are always found in amino acids?

A) Amine and sulfhydryl

B) Carbonyl and carboxyl

C) Carboxyl and amine

D) Alcohol and aldehyde

E) Ketone and amine

3 nucleic acids stores information

3.Nucleic AcidsStores information

Two types:


(deoxyribonucleic acid)


(ribonucleic acid)

Nucleotides are the building blocks of nucleic acids

Nucleotides are the building blocks of Nucleic acids.

4 lipids

Hydrophobic – Will not mix with water

Types of Lipids:

Phospholipids - form cell membranes

4. Lipids

The polar heads are towards the water, the nonpolar tails are on the inside of the cell.

Four types of organic molecules

  • Steroids cell messengers

    • examples: testosterone, estrogen

  • Waxesprotection & waterproofing

  • Four types of organic molecules

    • Triglycerides fats and oils

      • fats are made of chains of fatty acids

    Saturated unsaturated

    Saturated & Unsaturated

    Saturated - no double bonds

    solid at room temperature

    Unsaturated - have double bonds

    liquid at room temperature

    Review q4

    Review Q:

    Which macromolecule is the main component of cell membranes?






    Review q5

    Review Q:

    Which of the following macromolecules below could be structural parts of the cell, enzymes, or involved in cell movement or communication?

    Nucleic acids





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