science unit 2

a compound and a molecule

Chemical combination of two or more atoms from different elements

DNA is different from RNA in that

RNA contains an additional oxygen atom on the ribose sugar.

when a substance dissociates into OH- ions they are classified as

bases

a ________ reaction occurs when ionic or covalent bonds are broken and elements ions or simpler molecules are formed

decomposition

starch being broken down into sugar in the body is a ________ reaction

decomposition

the breakdown of a polysaccharide into monosaccharides is an example of

decomposition

the subatomic units which govern potential chemical reactions among elements are

electrons

All the subatomic particles participate in chemical reactions.

false

Starch is a monosaccharide.

false

a hydrogen bond is completed by the transfer of its sole electron to another element

false

carbohydrates always contain protein

false

the four organic molecules found in orginisms are carbohydrates proteins nucleic acids and amino acids

false

ionic bonds usually hold _______ compounds together

inorganic

water found in animal and human cells is most often found in the _______ phase of matter and oxygen is found in the ______ phase of matter

liquid and gas

in bonding of any type the _______ level electrons are involved

outer

________ helps the cell membrane to conserve internal fluids

phospholipids

Catalysts and enzymes are known to ________ a chemical reaction

speed up

When fats decompose in an organism, energy is released.

true

carbon is ideally suited to form covalent bonds

true

organic compounds form polymers

true

organic compounds usually contain many atoms

true