NAS 2 Final Exam Questions With Verified Answers

NAS 2 Final Exam Questions With Verified Answers Purpose of the Scientific Method - answerTo answer questions and solve problems Identify the Steps of the scientific method - answerObservation, Hypothesis, Predictions, Testing, Revise and Repeat, Report Results, Conclusion OHPTRRC - answerour happy pets tease red rubber chickens independent variable - answercontrolled by the investigator What is a dependent variable? - answerWhat you are measuring; not controlled by experimenter control group - answerstandard of comparison for experimental group experimental group - answerGroup that is being experimented on with variables homeostasis - answerthe process by which living things maintain a constant, stable internal environment. mechanisms for homeostasis - answerreceptor, control center, effector negative feedback - answerCells reverse direction to maintain homeostasis positive feedback - answercells maintain homeostasis by intensifying change in the same direction such as child birth or blood clotting Describe basic atomic structure - answerAtoms have a nucleus (with 2 subatomic particles), protons, neutrons and electrons ionic bonds - answercomplete transfer of electrons between two atoms covalent bonds - answerBonds that share a pair of electrons between two atoms hydrogen bonds - answerAttraction between a hydrogen atom and an electronegative atom Why is water essential for life? - answer67% of body weight, Covers 75% of the Earth's surface, essential for organism survival polar and non-polar covalent bonds - answerpolar bond doesn't share electrons equally and non-polar does