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