BIO 181 Exam# 1 (Chapters 1, 2, 3, 4 and Labs 1, 2, 3)
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Describe the six characteristics of all living organisms. ✔Correct Answer--Cellular Organization:
made up of cells
Ordered Complexity: very complex
Sensitivity: responds to environment
Growth, Development, and Reproduction:
Energy Utilization: make energy and convert to usable
Homeostasis: maintain internal factors at a steady rate
Evolutionary Adaption: changes based on environment
Define hypothesis. Describe two traits that a good hypothesis has. ✔Correct Answer--A hypothesis
is a possible explanation for an observation. Hypothesis must be able to be tested and allow
predictions to be made.
What is the difference between a test experiment and a control experiment? Why is a control
experiment so important? ✔Correct Answer--A test experiment has a variable that changed and
the control experiment is the same experiment with nothing changed. The control experiment is
necessary because it is needed to show that the variable is the reason for the result.
When does a hypothesis become a theory? ✔Correct Answer--A hypothesis becomes a theory
when it has been tested multiple times over a long period of time that yields the same results
throughout.
Describe the three components that make up the structure of an atom. Make sure that you discuss
the location and charge of the components. ✔Correct Answer--The three component that make up
an atom are protons, electrons, and neutrons. Protons are located in the nucleus and have a positive
charge. Neutrons are also located in the nucleus and are neutral in charge. Both the protons and the
neutrons have a mass of approximately 1 Dalton. Electrons are located in the orbitals and have a
negative charge. The electrons have no mass.
What is the difference between mass and weight? ✔Correct Answer--Mass is the amount of a
substance and Weight is the force gravity exerts upon substance.
Define the terms oxidation and reduction. ✔Correct Answer--Oxidation is the loss of an electron
and Reduction is the gaining of an electron. These happen in chemical reactions.
Sodium has 11 electrons. How many electrons are in its valence electron shell. Does this satisfy the
octet rule? If not, what can sodium do to satisfy the octet rule? ✔Correct Answer--Sodium has 1
electron in its valence electron shell. This does not satisfy the octet rule. To satisfy the octet rule
sodium can lose an electron and become a ion (Na+).
Why is water considered a polar molecule? Make sure that you use the work electronegativity in
your answer. ✔Correct Answer--Water is a polar molecule because oxygen has a higher
electronegativity than Hydrogen which means that the electrons are pulled more to oxygen and away
with all Correct & 100% Verified Answers| Latest
Update |Already Graded A+
Describe the six characteristics of all living organisms. ✔Correct Answer--Cellular Organization:
made up of cells
Ordered Complexity: very complex
Sensitivity: responds to environment
Growth, Development, and Reproduction:
Energy Utilization: make energy and convert to usable
Homeostasis: maintain internal factors at a steady rate
Evolutionary Adaption: changes based on environment
Define hypothesis. Describe two traits that a good hypothesis has. ✔Correct Answer--A hypothesis
is a possible explanation for an observation. Hypothesis must be able to be tested and allow
predictions to be made.
What is the difference between a test experiment and a control experiment? Why is a control
experiment so important? ✔Correct Answer--A test experiment has a variable that changed and
the control experiment is the same experiment with nothing changed. The control experiment is
necessary because it is needed to show that the variable is the reason for the result.
When does a hypothesis become a theory? ✔Correct Answer--A hypothesis becomes a theory
when it has been tested multiple times over a long period of time that yields the same results
throughout.
Describe the three components that make up the structure of an atom. Make sure that you discuss
the location and charge of the components. ✔Correct Answer--The three component that make up
an atom are protons, electrons, and neutrons. Protons are located in the nucleus and have a positive
charge. Neutrons are also located in the nucleus and are neutral in charge. Both the protons and the
neutrons have a mass of approximately 1 Dalton. Electrons are located in the orbitals and have a
negative charge. The electrons have no mass.
What is the difference between mass and weight? ✔Correct Answer--Mass is the amount of a
substance and Weight is the force gravity exerts upon substance.
Define the terms oxidation and reduction. ✔Correct Answer--Oxidation is the loss of an electron
and Reduction is the gaining of an electron. These happen in chemical reactions.
Sodium has 11 electrons. How many electrons are in its valence electron shell. Does this satisfy the
octet rule? If not, what can sodium do to satisfy the octet rule? ✔Correct Answer--Sodium has 1
electron in its valence electron shell. This does not satisfy the octet rule. To satisfy the octet rule
sodium can lose an electron and become a ion (Na+).
Why is water considered a polar molecule? Make sure that you use the work electronegativity in
your answer. ✔Correct Answer--Water is a polar molecule because oxygen has a higher
electronegativity than Hydrogen which means that the electrons are pulled more to oxygen and away
