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26 Cards in this Set

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unicellular
Some organisms are composed of only one cell. These organisms are called ___ organisms.
multicellular
Most of the living things that you see around you are ___ organisms. That is, they are composed of more than one cell.
differentiation
The cells of multicellular organisms undergo ___. That is, they become different from each other as they multiply and follow the various roles supplied for them by their genetic instructions.
sexual
In ___ reproduction, hereditary information form two parts of a single organism or from two organisms of the same species is combined.
asexual
___ reproduction is the production of offspring that does not involve the union of gametes.
natural selection
According to the theory of evolution by ___, organisms that have certain favorable traits are better able to successfully reproduce than organisms that lack these traits.
photosynthesis
Through the process of ___, plants and some types of unicellular organisms capture the energy from the sun and change it into a form of energy that can be used by living things.
cells
All living things are composed of ___.
metabolism
All living things use energy in a process called ___, which is the sum of all of the chemical processes that occur in the organism.
observation
___ typically employs one or more of the five senses to perceive objects or events.
sampling
Scientific ___ is the technique of using a small part to represent an entire population.
control group
A ___ is a group of individual that serves as a standard of comparison with another group individual to which it is identical excpet for one factor.
independent variable
The ___ is an experimentally manipulated variable.
dependent variable
The ___ is the responding variable is an experiment.
analyzing data
___ is the process of determining whether data are reliable and whether they support or do not support a hypothesis or prediction.
model
A ___ is essentially an explanation supported by data. It can be visual, verbal, or mathematical.
inference
A ___ is a conclusion made on the basis of facts or premises rather tahn on direct observations.
theory
A ___ is a broad and comprehensive statement of what is thought to be true.
light microscope
Biologists typically use the compound ___ to see small organisms and cells.
electron microscopes
To examine specimens even smaller than cells, such as cell parts or viruses, scientists may chose from several types of ___.
transmission electron microscope
The ___ transmits a beam of electrons through a very thinly sliced specimen.
scanning electron microscope
The ___ provides striking three-dimensional images.
stage
To be viewed with a compound light microscope, a specimen is mounted on a glass slide. The slide holding the specimen is placed over the opening in the ___ of the microscope.
objective lens
When using a compound light microscope, light passes through the specimen and through the ___, which is positioned directly above the specimen.
ocular lens
When using a compound light microscope, the objective lens enlarges the image of the specimen. This magnified image is projected up through the body tube to the ___ in the eyepiece, where it is magnified further.
nosepiece
Most light microscopes have a set of objective lenses with different powers of magnification. These lenses can be rotated into place by revolving the ___.