BSC 1005: Review Sheet for Test 1
How science is actually done: theories, hypothesis, and applying the scientific method
Theories is a
general set of principles, supported by evidence that explains some aspect of nature.
Scientific method (you should know the order of the steps):
Formulating a hypothesis (you should know what a hypothesis is
: A tentative, testable
explanation for an observed phenomenon.
Experiments (need to know what a variable, a control group, and the experimental group are;
also that you need to replicate or test many individuals due to the inherent variability of living
Variable= an adjustable condition in an experiment. Control group= The group that stays
constant. Experimental group= The group that is being tested.
The definition of life (need to know 7 main traits of living things)
*Can assimilate (take in) and use
energy. *Can respond to their environment. *Can maintain a relatively constant internal environment.
*Possess an inherited information base, encoded in DNA, that allows them to function. *Can reproduce
through use of the information encoded in DNA. *Are composed of one or more cells. *Evolved from
other living things. *Are highly organized compared to inanimate objects.
and hierarchy of living things
(learn the order, from smallest (atoms) to largest (biosphere)):
Atom (hydrogen), Molecule (water),
Organelle (nucleus), cell (neuron), tissue (nervous tissue), organ (brain), organ system (nervous system),
organism (sea lion), population (colony), community (giant kelp forest), ecosystem (southern California
coast), biosphere (earth).
The role of evolution as the chief unifying principle of biology:
Biology’s chief unifying principle is
evolution, which can be defined as the gradual modification of populations of living things over time,
with this modification sometimes resulting in the development of new species. Evolution provides the
means for making sense of the forms and processes seen in living things on Earth today.
Name the three subatomic particles.
Electrons, protons and neutrons
. Which contribute charge?
Electrons= are negatively charged. Protons= are positively charged. Neutrons= have no charge.
particles allow atoms to interact with each other?
Electrons interact with each other by combining with
What is an atom’s atomic number?
An elements atomic number is the number of protons in its nucleus.
What is an isotope?
The number of neutrons in an atom can vary independently of the number of protons.
Thus, a single element can exist in various forms, called isotopes, depending on the number of neutrons it
What is an ion?