Biology Unit 2

Catalyst and enzymes

speed up chemical reactions,. These are not consumed in the reaction

DNA is different from RNA in its function and also in structure

DNA contains deoxyribose and sugar RNA contains ribose

The breakdown of polysaccharide into monosaccharides

is an example of decomposition

oxygen

is found in the gas phrase of matter

Carbon

is ideally suited to form covalent bonds

A hydrogen bond

is not complete by the transfer of its sole electron to another element

A compound consist of

2 or more distinct atoms

A molecule may consist of

2 similar elements chemically bonded

An example of a decomposition reaction

is starch being broken down into sugar in the body

Carbohydrates are

a quick source of energy

Four major divisions of biological organic substances

are carbohydrates, lipids, proteins, and nucleic acids. (polymers)

phospholipids help

cell walls to conserve internal fluids

Carbohydrates do not always

contain protein

All the subatomic particles

do not participate in a chemical reaction

Valence level

electrons are involved in any type of bonding

When = fats decompose in an organism,

energy is released

Organic compounds

form polymers

water

found in animals and human cells is most often found in the liquid phase of matter

Starch is not a

monosaccharide

Most carbohydrates are

monosaccharides

A Decomposition reaction

occurs when ionic or covalent bonds are broken and elements =, ions, or simpler molecules are formed

Covalent bonds

usually hold organic compounds together