HW # 51- Revise your Essay.

Warm up

- What do lipids do for your body? What are the types of lipids?

Week 16, Day Two

Warm up Response

-Lipids are energy rich organic compounds made of carbon, hydrogen and oxygen

-They contain more energy than carbohydrates

-Cells store lipids for later use.

-Lipids also make up most of the cell membrane.

Homework Response/CheckD

Goals for Today

• Quick discussion on Carbs, Lipids, Proteins, etc.

• Work on Essay Revision (Introduction)• Complete Chemical Compounds in Cells (and review)• Begin Study Guide

Element

• Substance that cannot be broken down into simpler substances. Example: carbon.

The most common elements in living things are:

• Carbon•Oxygen•Hydrogen•Nitrogen

Atom

• The smallest unit of an element

Compound

• A compound is two or more elements that are chemically combined.The smallest unit of a compound is a molecule.

An example of a compound is water.

Compounds

Organic and Inorganic Compounds

• Inorganic compounds do not contain carbon. • Examples: water (H2O) & table salt (NaCl).

• Organic compounds contain carbon and hydrogen and are associated with living things.

• Examples: (next slide)

Four most important groups of organic compounds found in living things are:

• Carbohydrates• Lipids• Proteins• Nucleic Acids

Carbohydrates• Energy-rich compound made of

carbon, hydrogen, and oxygen• Supply energy for cell processes;

short-term energy source• Most important source of energy for

body• Sugars-fruits, starch-pasta, and

cellulose-found in cell walls of plants

Proteins• Made of elements carbon, oxygen, hydrogen, nitrogen, and sulfur

• Regulate cell processes and build cell structure• s• Made up of smaller molecules linked together chemically called amino acids • Enzymes speed up chemical reactions

Lipids• Energy-rich compounds made of carbon,

hydrogen, and oxygen

• Store large amounts of energy long term; form boundaries around cells

• Fats, oils, waxes, and cholesterol

Nucleic Acids• Made of the elements carbon, oxygen, hydrogen, nitrogen, and phosphorus

2 kinds of nucleic acids • DNA - Carries hereditary information (chromatin in nucleus)• RNA - used to make proteins (cytoplasm & nucleus)

Makes up about 2/3 of your body Most chemical reactions in cells

require water Helps cells keep their size and shape Helps keep temperature of cells from

changing rapidly

Water and Living Things