BIO 264 FINAL EXAM UPDATED Study Guide CORRECT ANSWERS

BIO 264 FINAL EXAM UPDATED Study
Guide CORRECT ANSWERS
QUESTIONS
- What is homeostasis? - CORRECT ANSWERS The
maintenance of a stable internal environment within a narrow range.


What are the components of a control system? - CORRECT
ANSWERS Variable, receptor, control center, set point,
effector.


Difference between negative and positive feedback? - CORRECT
ANSWERS Negative feedback reverses a change; positive
feedback amplifies a change


What are protons, neutrons, and electrons? - CORRECT ANSWERS
Protons (+ charge), neutrons (no charge), electrons (- charge).


What is atomic number? - CORRECT ANSWERS Number of
protons (and electrons if neutral).


What is mass number? - CORRECT ANSWERS Number of
protons + neutrons.


How do you calculate neutrons? - CORRECT ANSWERS
Mass number - atomic number.

, What is an isotope? - CORRECT ANSWERS Atoms with the
same number of protons but different numbers of neutrons.


What is an ion? - CORRECT ANSWERS A charged particle
where protons ≠ electrons


What is a cation? - CORRECT ANSWERS Positively charged
ion.


What is an anion? - CORRECT ANSWERS Negatively
charged ion


What is an ionic bond? - CORRECT ANSWERS Electrons are
transferred between atoms.


What is a covalent bond? - CORRECT ANSWERS Electrons
are shared between atoms.


What is a hydrogen bond? - CORRECT ANSWERS A weak
attraction between polar molecules


What determines bond type? - CORRECT ANSWERS
Number of electrons needed in the outer shell.


What does hydrophilic mean? - CORRECT ANSWERS
Water-loving; dissolves in water.