BIOLOGY 160 EXAM 1 QUESTIONS
WITH COMPLETE ANSWERS
Matter cycles within... - ANSWER-living systems.
All organisms grow and develop. Growth is just an increase in size. In development...
- ANSWER-structure and function change in an orderly way as an organism passes
through its life cycle
An individual's pattern of development is partly determined by genetic instructions.
DNA.... - ANSWER-the molecule of inheritance, encodes proteins and other
molecules that build cells and make them work.
Reproduction occurs when an individual organism passes on its genetic information
to... - ANSWER-a newly independent organism, or offspring.
Evolution - ANSWER-A scientific theory explaining how and why genetic changes
occur in populations or higher-level groups over generations of time.
The two fundamental tenets of evolution are... - ANSWER-shared ancestry and
natural selection.
Scientific Method - ANSWER-observation, question, hypothesis, scientific
experiment, and conclusion
Independent Variable - ANSWER-A cause or factor; a variable that is thought to
cause another variable to change. In an experiment, an independent variable is
deliberately changed in one group at the beginning of the study.
Dependent Variable - ANSWER-An effect; a variable that is thought to change as a
result or consequence of some other variable. In an experiment, a dependent
variable is used to describe the result, or outcome.
Other variables must be kept as similar as possible between the study groups and
are called... - ANSWER-control variables
Calories is a measure of... - ANSWER-energy
Everyday objects are mostly mixtures of.... - ANSWER-molecules, which in turn are
made up of atoms.
The changes in the atomic composition of a substance that occur as a result of the
attraction or repulsion of two or more atoms is called a chemical reaction. -
ANSWER-A chemical reactions produce one or more products resulting from a
chemical change that transforms a set of molecules.
All atoms have a nucleus, made up of... - ANSWER-protons (+) and neutrons(+-),
and are surrounded by electrons(-).
, Atoms come in different types, called... - ANSWER-elements. Also, atoms are the
smallest unit of elements.
Count the number of protons in the atom's nucleus, and that will tell you what kind of
element that atom is.. - ANSWER-The number of protons in an atom is denoted by
the atomic number displayed for each element in the periodic table
major elements - ANSWER-carbon (C), hydrogen (H), nitrogen (N), oxygen (O),
phosphorus (P), and sulfur (S). These elements represent more than 95% of the
mass of a cell.
Protons and neutrons reside in the nucleus (center) of the atom and have a mass
of... - ANSWER-one atomic mass unit (amu) each
Electrons are found outside of the nucleus, in zones that are called "shells." -
ANSWER-Electrons have almost no mass.
The atomic mass is the sum of.... - ANSWER-the number of protons and the number
of neutrons.
Enzyme - ANSWER-A protein that speeds up the rate of chemical reactions that
support life.
Cells typically keep their internal pH (acidity) within a narrow range. This is important
because.... - ANSWER-changes in pH can cause molecules like enzymes to change
their shapes.
Homeostasis - ANSWER-The tendency of organisms and cells to maintain stable
internal conditions. The term comes from the Greek words homeo (same, alike) and
stasis (standing).
Ultimately, if homeostasis is not restored, an organism will.... - ANSWER-die.
Humans maintain a blood pH between 7.35 and 7.45. In order to maintain
homeostasis, how will your body respond if your blood pH drops to 7.0? - ANSWER-
If you blood pH is 7.0, your body will raise your pH.
Matter is made of... - ANSWER-atoms.
Any matter an organism needs but cannot make for itself is considered a _____ for
that organism - ANSWER-Nutrient
Both nutrients and wastes are made of atoms; they occupy space and have.... -
ANSWER-mass
The atoms retain their ____ through the processes of life, even though they can be
combined with other atoms in different ways. - ANSWER-Identity
WITH COMPLETE ANSWERS
Matter cycles within... - ANSWER-living systems.
All organisms grow and develop. Growth is just an increase in size. In development...
- ANSWER-structure and function change in an orderly way as an organism passes
through its life cycle
An individual's pattern of development is partly determined by genetic instructions.
DNA.... - ANSWER-the molecule of inheritance, encodes proteins and other
molecules that build cells and make them work.
Reproduction occurs when an individual organism passes on its genetic information
to... - ANSWER-a newly independent organism, or offspring.
Evolution - ANSWER-A scientific theory explaining how and why genetic changes
occur in populations or higher-level groups over generations of time.
The two fundamental tenets of evolution are... - ANSWER-shared ancestry and
natural selection.
Scientific Method - ANSWER-observation, question, hypothesis, scientific
experiment, and conclusion
Independent Variable - ANSWER-A cause or factor; a variable that is thought to
cause another variable to change. In an experiment, an independent variable is
deliberately changed in one group at the beginning of the study.
Dependent Variable - ANSWER-An effect; a variable that is thought to change as a
result or consequence of some other variable. In an experiment, a dependent
variable is used to describe the result, or outcome.
Other variables must be kept as similar as possible between the study groups and
are called... - ANSWER-control variables
Calories is a measure of... - ANSWER-energy
Everyday objects are mostly mixtures of.... - ANSWER-molecules, which in turn are
made up of atoms.
The changes in the atomic composition of a substance that occur as a result of the
attraction or repulsion of two or more atoms is called a chemical reaction. -
ANSWER-A chemical reactions produce one or more products resulting from a
chemical change that transforms a set of molecules.
All atoms have a nucleus, made up of... - ANSWER-protons (+) and neutrons(+-),
and are surrounded by electrons(-).
, Atoms come in different types, called... - ANSWER-elements. Also, atoms are the
smallest unit of elements.
Count the number of protons in the atom's nucleus, and that will tell you what kind of
element that atom is.. - ANSWER-The number of protons in an atom is denoted by
the atomic number displayed for each element in the periodic table
major elements - ANSWER-carbon (C), hydrogen (H), nitrogen (N), oxygen (O),
phosphorus (P), and sulfur (S). These elements represent more than 95% of the
mass of a cell.
Protons and neutrons reside in the nucleus (center) of the atom and have a mass
of... - ANSWER-one atomic mass unit (amu) each
Electrons are found outside of the nucleus, in zones that are called "shells." -
ANSWER-Electrons have almost no mass.
The atomic mass is the sum of.... - ANSWER-the number of protons and the number
of neutrons.
Enzyme - ANSWER-A protein that speeds up the rate of chemical reactions that
support life.
Cells typically keep their internal pH (acidity) within a narrow range. This is important
because.... - ANSWER-changes in pH can cause molecules like enzymes to change
their shapes.
Homeostasis - ANSWER-The tendency of organisms and cells to maintain stable
internal conditions. The term comes from the Greek words homeo (same, alike) and
stasis (standing).
Ultimately, if homeostasis is not restored, an organism will.... - ANSWER-die.
Humans maintain a blood pH between 7.35 and 7.45. In order to maintain
homeostasis, how will your body respond if your blood pH drops to 7.0? - ANSWER-
If you blood pH is 7.0, your body will raise your pH.
Matter is made of... - ANSWER-atoms.
Any matter an organism needs but cannot make for itself is considered a _____ for
that organism - ANSWER-Nutrient
Both nutrients and wastes are made of atoms; they occupy space and have.... -
ANSWER-mass
The atoms retain their ____ through the processes of life, even though they can be
combined with other atoms in different ways. - ANSWER-Identity
