Which is NOT a characteristic of all life?
Random cell structure
The process of maintaining a constant internal environment is called
A controlled experiment is one in which
Variables are allowed only in the control group
Only one independent variable is allowed in the experimental group
All the variables are controlled
Dependent variables are introduced in the control group
A control group differs from an experimental group
In the number of test organisms used
By the independent variable
In several ways
In no way
Which of the following is NOT a science?
Information from experiments is considered valid if
The same results are obtained each time the experiment is performed
The results were predicted by the hypothesis
The same results are obtained by several scientists
All of these statements are true
According to the concept of “What Makes Something Alive?” ____ is a responsive process.
___________ are the fundamentalstructural units of all living things.
Why is NaHCO3 considered a base in the following reaction?
NaHCO3 + HCl → NaCl + CO2 + H2O
It contains hydrogen ions
It is a hydrogen ion acceptor
It donates hydroxide ions in this reaction
It results in the formation of CO2
When electrons in a covalent bond are shared equally, the molecule is said to be
Unable to form hydrogen bonds
If a particular atom has 27 electrons, 27 protons, and 31 neutrons, its mass number would be
A difference between an acid and a base is that
Acids are harmful and bases are not
Acids release hydroxide ions and bases release hydrogen ions
Acids have a high pH value and bases have a low pH value
Acids have a low pH value and bases have a high pH value
The atomic number for carbon is 6. The isotope 14C has ____ neutrons.
A particle in the atom that has neither a negative nor a positive electrical charge is the
Which of the following is an acid?
Kinetic energy is BEST defined as
The energy of position
The energy of electrical charge
The energy of motion
Which of these is a component of ribosomes?
A nucleotide is composed of the following molecules arranged in this order:
Three amino acids covalently bonded in a series.
Three fatty acids individually bonded to three different places on glycerol.
A base bonded to a sugar bonded to a phosphate.
mRNA bonded to tRNA bonded to an amino acid.
Which of the following has the highest protein content?
A complex carbohydrate consists of repeated units of
Which of the following is a function of proteins?
Contain information for the cell.
Serve as a subunit in the structure of fat.
Reduce the weight of an individual.
Speed up certain chemical reactions.
When four polypeptides are joined together by covalent bonds, they form a new, biologically active molecule that displays ____________ structure.
A nucleotide contains
Glycerol and fatty acids.
A base, sugar, and phosphate group.
An acid, base, and salt.
____ is a sugar.
Carbohydrates are a source of