Aim: How are living things similar, chemically?

DO NOW:1. What kind of chemical molecules can we find

in our bodies?2. What does your diet consist of?

Chemical Composition

• All living things are made up of 4 main elements: carbon (C)

hydrogen (H) oxygen (O) nitrogen (N)

• Other elements are also present in small amounts

Organic Molecules

• Contain both carbon and hydrogen• Proteins, lipids (fats, oils & waxes),

carbohydrates, nucleic acids• Ex. Glucose (simple sugar) C6H12O6

Lipids

Nucleic Acids

Inorganic Molecules

• Do not have carbon & hydrogen together but can have any element combined with other elements

• Salts, minerals, water (H2O)

• Oxygen (O2) , carbon dioxide (CO2)

Water

Other Similarities

• Made of cells: basic units of structure & function

• Carry on life processes

Levels of Organization in Living Things

• Cells Tissues Organs Organ Systems Organism

BrainPop Video

• https://www.brainpop.com/science/matterandchemistry/bodychemistry/

Review Questions

• 1. What group of organic compounds does DNA belong to?

• 2. Which organic compounds make up the most mass in a typical body cell?

• 3. Describe two types of chemical reactions that take place in your bodies, all the time.

• 4. Why is water, an inorganic compound, so important to your cells?

Homework

• Complete vocabulary handout based on video• You can use your textbook for help or the

internet