All the following are lesser elements in our bodies except
A)potassium.
B)sulfur
.C)nitrogen
.D)chlorine.
nitrogen
Valence electrons
A)determine chemical bonding properties
B)are electrons of the outermost shell
C)have a maximum number of eight
D)All of the above.
all of the above
The transfer of electrons from one atom to another is called
A)ionization.
If an atom undergoes ionization to lose two electrons, what is its new charge?
postive 2
Molecules that freely dissolve in water are said to be
hydrophillic
When counting items we commonly refer to twelve of something as "a dozen." What is the term used to describe Avogadro's number of 6.023 X 10 to the 23rd?
a mole
A catalyst would
reduce the reaction time
What type of reaction is represented in the following chemical equation? AB ---> A + B
A)decomposition reaction
ATP is commonly used as a(n) ________________.
A)enzyme.
B)protein.
C)nucleic acid.
D)energy currency molecule for the cell.
D)energy currency molecule for the cell.
The removal of a phosphate group would yield
A)a large amount of energy.
B)biological inactivity of the molecule.
C)GDP.
D)None of the above.
A)a large amount of energy.
Which of the following is true about a triglyceride molecule?
A)It contains a glycerol molecule.
B)It contains three fatty acids.
C)It has a neutral pH.
D)All of the above.
D)All of the above.
Which of the following conjugated carbohydrates are attached to cell surfaces?
A)glycogen and amylose
B)glycolipids and glycoproteins
C)cellulose and starch
D)All of the above.
B)glycolipids and glycoproteins
Which of the forms of ionizing radiation from a source outside the body is the most dangerous?
A)alpha particle
B)beta particle
C)gamma ray
D)neutron particle
C)gamma ray
Which of the following is incorrect?
A)Isotopes have identical chemical behaviors.
B)Isotopes have different physical properties.
C)Isotopes have the same atomic weights but different atomic numbers.
D)Unstable isotopes decay and release radiation.
C)Isotopes have the same atomic weights but different atomic numbers.
The amount of an electrolyte that would neutralize one mole of H+ or OH- is always called
one equivalent (Eq).
Chemical solutions that resist changes in pH are called _____________.
buffers
For the reaction: CO2 + H2O → H2CO3 → HCO3 - + H+, what would result if an acid is added?
A)A shift to the left side of the equation would occur producing more CO2 + H2O.
B)It would remain at equilibrium.
C)A shift to the right side of the equation would occur producing more HCO3 -.
D)More H2CO3 would remain.
A)A shift to the left side of the equation would occur producing more CO2 + H2O.
When a nicotinamide molecule picks up an extra electron, it becomes
reduced
The joining of two glucose molecules, with the subsequent removal of water to form maltose is an example of a(n) __________ reaction.
dehydration synthesis
Which of these carbohydrates is impossible for humans to digest?
A)cellulose
B)amylose
C)glycogen
D)galactose
A)cellulose
What is the primary function of eicosanoids?
chemical signaling between cells