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The four organic molecules found in all living systems
are carbohydrates, nucleic acids, lipids, and ________.
The chemical and physical processes that are involved
in energy and molecular transformations in living organisms are collectively
Organisms made up of one cell are said to be ________.
A group of similar organisms capable of interbreeding
and producing fertile offspring is a
The ability to stand upright and walk on two legs is
Humans can grasp objects between their thumbs and
fingers because the thumb is ________.
A group of tissues working together for a common
purpose is known as a(n) ________.
Factors that are varied during an experimental
procedure are called ________.
A(n) ________ is a tentative statement about the
natural world that can lead to a testable deduction.
The process by which an individual makes a
generalization after examining specific cases is ________ reasoning.
The first step of the scientific method is ________.
A properly designed controlled experiment should
include both an ________ group and a ________ group.
) Data obtained from scientific experiments can best
be displayed in a ________, which can be used to explain the results of an
experiment as well.
) Information that takes the form of a testimonial is
considered to be ________, not scientific.
The application of scientific knowledge to improve the
condition of humans is known as
The pure form of matter that cannot be broken down
into a simpler form is a(n) ________.
Atoms bond to one another to form a stable association
Atoms react with one another and form chemical bonds
in order to ________.
fill the outermost shell of electrons
Molecules that are polar and attracted to water are
________; molecules that are nonpolar and therefore not attracted to water are
A substance that helps to maintain a stable pH is a(n)
) Large organic molecules that are composed of
thousands of smaller molecules bonded to one another are known as ________.
The process by which cells break down organic
macromolecules into their subunits is ________.
) In order for a cell to produce a fat, it must have
one molecule of ________ and three ________.
glycerol, fatty acids
The structure of a cell membrane includes a modified
form of lipid called a ________.
Cells that have a membrane-bound organelles and
cytoplasm are classified as ________ cells.
Many cells use tiny projections of their plasma
membrane called ________ to increase the surface area relative to cell volume.
Plasma membranes become less fluid when ________ is
Because the plasma membrane regulates the transport of
molecules into and out of the cell by allowing only certain substances to pass,
it is said to be ________.
The net diffusion of water across a plasma membrane is
known as ________.
The movement of large molecules or large quantities of
molecules into a cell is accomplished through ________; movement of these
molecules out of the cell is accomplished through ________.
Plasma membrane proteins that can receive and transmit
information across the membrane are known as ________ proteins.
The primary function of the ________ is to remove
certain unwanted ions from the cell in exchange for molecules that the cell
Molecules pass in and out of the nucleus through
openings in the nuclear membrane called
The ________ is surrounded by an outer membrane which
encloses an inner membrane that is highly folded; this organelle is associated
with the breakdown of chemical bonds in food.
Microtubules and microfilaments compose the ________,
which forms an internal network of support for the cell.
Chemical reactions that take place in living organisms
are collectively known as the organism's ________.
Anabolic reactions result in the ________
(building/breakdown) of large molecules and therefore ________
Cellular respiration occurs in the ________
(organelle) of the cell.
The only way that cells can produce ATP in the absence
of oxygen is through the process of
Specialized epithelial tissues that produce and
secrete a product are known as ________.
Glands that secrete their product into a duct are
classified as ________ glands.
Epithelial tissues are classified according to the
number of cell layers making up the tissue and ________.
Spot desmosomes are actually ________ junctions which
allow for slight flexibility in an epithelium.
Connective tissue is unique because the cells secrete
an ________ that can be a semi-liquid
The protein fibers of a fibrous connective tissue
matrix are embedded in a ________ that is made up of water, polysaccharides,
Connective tissue cells that produce collagen,
elastic, and reticular fibers are the ________.
Cells in cartilage that produce the ground substance are the ________.
Skeletal muscle attaches to ________, which attaches
the muscle to bone.
Cardiac muscle is located only in the ________.
Nervous tissue is composed of two types of cells:
________ that conduct impulses and ________ that surround and protect these
neurons, glial cells
A group of
two or more tissues that function as a unit is a(n) ________.
The presence of a suntan is due to increased activity
of ________ in response to increased levels of ultraviolet radiation
A gland located in the dermis of the skin that helps
to regulate body temperature is the ________ gland.
The ability of living organisms to maintain a constant
internal environment despite changes in the external environment is ________.