Chemistry of Life Test
An enzyme is
a biological catalyst
Which statement correctly relates to DNA and RNA?
RNA reads and translates the DNA code
Phospholipids
help the cell membrane to conserve internal fluids
Ionic bonds usually hold ______ compounds together
inorganic
What is necessary for reactants to combine chemically?
input of energy
A decomposition reaction occurs when
ionic or covalent bonds are broken and elements, ions, or simpler molecules are formed
cholesterol
lipid
DNA contains _____ sugar
deoxyribose
Genetic codes contain
complex information; detailed instructions
Starch is made up of
units of C6H12O6
When salts are dissolved in water
the components separate into ions
T/F A molecule may consist of 2 similar elements chemically bonded
True
T/F Carbon is ideally suited to form covalent bonds
True
T/F Organic compounds form polymers
True
T/F Organic compounds usually contain many atoms
True
When fats decompose in an organism, energy is released
True
In the process of ionic bonding
outer energy level electrons are gained and lost
RNA contains ____ sugar
ribose
Electrons of a neutral atom always equal
the number of protons
A chemical reaction in your body in which bonds are broken is associated with:
the release of energy
An atom that has 12 protons in its nucleus has an atomic number of
12
T/F A hydrogen bond is completed by the transfer of its sole electron to another element
False
T/F All the subatomic particles participate in chemical reactions
False
T/F Carbohydrates always contain protein
False
T/F Starch is a monosaccharide
False
T/F The 4 organic molecules found in organisms are carbohydrates, proteins, nucleic acids and amino acids
False
Decomposition reaction
Starch being broken down into sugar
electrons
The subatomic particles/units which govern chemical reactions among elements
T/F A compound consists of 2 or more distinct atoms
True
proteins
antibodies, certain hormones, hemoglobin
When a substance dissociates into OH- ions, they are classified as _____
bases
Why can carbon bond to many elements simultaneously?
because it is capable of forming multiple covalent bonds
Decomposition example
breakdown of a polysaccharide into monosaccharides
sugar
carbohydrate
AB--A+B
decomposition reaction
Water found in animal and human cells is most often found in the _______ phase of matter
liquid
DNA
nucleic acid
In bonding of any type, the _____ level electrons are involved
outer
Oxygen is found in the ______ phase of matter
oxygen
hemoglobin
protein
Carbohydrates
quick source of energy; most are monosaccharides
Catalysts and enzymes are known to _____ a chemical reaction
speed up
Which processes are involved in metabolism?
synthesis, growth, repair, decomposition, energy release, reversible reactions, equilibrium, exchange reactions, control of PH
