1
NAS 2 TCC Study Guide 2026 | Complete Questions
and Correct Answers (Verified Answers) | Updated
Version
What is the purpose of the scientific method? - (ANSWER)The scientific method
is an organized way to study the natural world and find out how it works.
What are the steps of the scientific method? - (ANSWER)Ask a Question.
Do Background Research.
Construct a Hypothesis.
Test Your Hypothesis by Doing an Experiment.
Analyze Your Data and Draw a Conclusion.
Communicate Your Results.
Distinguish between independent and dependent variables - (ANSWER)An
independent variable is the variable that is changed or controlled in a scientific
experiment to test the effects on the dependent variable.
A dependent variable is the variable being tested and measured in a scientific
experiment.
, 2
Distinguish between control and experimental groups - (ANSWER)An
experimental group is the group in an experiment that receives the variable being
tested. One variable is tested at a time. The experimental group is compared to a
control group, which does not receive the test variable.
Distinguish between hypothesis and theory. - (ANSWER)A hypothesis is an
attempt to explain phenomena. It is a proposal, a guess used to understand
and/or predict something. A theory is the result of testing a hypothesis and
developing an explanation that is assumed to be true about something.
Define Anatomy and Physiology - (ANSWER)Anatomy is the study of the structure
and relationship between body parts.
Physiology is the study of the function of body parts and the body as a whole.
Identify the six levels of organization (chemical, tissue, etc.) - (ANSWER)1)
Chemical Level
2) Cellular level
3)Tissue level
4)Organ level
5)Organ system level
, 3
6) Organismal level
Identify the requirements for life: - (ANSWER)1. Reproduction 2.
Response/reaction to environment 3. Metabolism 4. Growth.
Identify survival needs: - (ANSWER)survival needs (5): nutrients, oxygen, water,
stable body temperature, and atmospheric pressure
What is homeostasis? - (ANSWER)The tendency of an organism or a cell to
regulate its internal conditions, usually by a system of feedback controls, so as to
stabilize health and functioning, regardless of the outside changing conditions.
What are the basic mechanisms of homeostasis? - (ANSWER)- Homeostatic
control mechanisms have at least three interdependent components: receptor,
control center, and effector.
- The receptor senses environmental stimuli, sending the information to the
control center.
- The control center, generally the brain, signals an effector (e.g. muscles) to
respond to the stimuli.
- Positive feedback enhances or accelerates output created by an activated
stimulus.
NAS 2 TCC Study Guide 2026 | Complete Questions
and Correct Answers (Verified Answers) | Updated
Version
What is the purpose of the scientific method? - (ANSWER)The scientific method
is an organized way to study the natural world and find out how it works.
What are the steps of the scientific method? - (ANSWER)Ask a Question.
Do Background Research.
Construct a Hypothesis.
Test Your Hypothesis by Doing an Experiment.
Analyze Your Data and Draw a Conclusion.
Communicate Your Results.
Distinguish between independent and dependent variables - (ANSWER)An
independent variable is the variable that is changed or controlled in a scientific
experiment to test the effects on the dependent variable.
A dependent variable is the variable being tested and measured in a scientific
experiment.
, 2
Distinguish between control and experimental groups - (ANSWER)An
experimental group is the group in an experiment that receives the variable being
tested. One variable is tested at a time. The experimental group is compared to a
control group, which does not receive the test variable.
Distinguish between hypothesis and theory. - (ANSWER)A hypothesis is an
attempt to explain phenomena. It is a proposal, a guess used to understand
and/or predict something. A theory is the result of testing a hypothesis and
developing an explanation that is assumed to be true about something.
Define Anatomy and Physiology - (ANSWER)Anatomy is the study of the structure
and relationship between body parts.
Physiology is the study of the function of body parts and the body as a whole.
Identify the six levels of organization (chemical, tissue, etc.) - (ANSWER)1)
Chemical Level
2) Cellular level
3)Tissue level
4)Organ level
5)Organ system level
, 3
6) Organismal level
Identify the requirements for life: - (ANSWER)1. Reproduction 2.
Response/reaction to environment 3. Metabolism 4. Growth.
Identify survival needs: - (ANSWER)survival needs (5): nutrients, oxygen, water,
stable body temperature, and atmospheric pressure
What is homeostasis? - (ANSWER)The tendency of an organism or a cell to
regulate its internal conditions, usually by a system of feedback controls, so as to
stabilize health and functioning, regardless of the outside changing conditions.
What are the basic mechanisms of homeostasis? - (ANSWER)- Homeostatic
control mechanisms have at least three interdependent components: receptor,
control center, and effector.
- The receptor senses environmental stimuli, sending the information to the
control center.
- The control center, generally the brain, signals an effector (e.g. muscles) to
respond to the stimuli.
- Positive feedback enhances or accelerates output created by an activated
stimulus.
