BSC 215 Exam 1 (UA Hodges) Questions
and All Solved Solutions 2026 Updated.
What are the 7 characteristics of life? - Answer 1. Homeostasis
2. Organization
3. Metabolism
4. Growth
5. Adaptation
6. Response to Stimuli
7. Reproduction
What are the major structural levels of organization of the body? - Answer 1. Chemical level
2. Cellular level
3. Tissue level
4. Organ level
5. Organ System level
6. Organism level
Describe the principle of Homeostasis - Answer -Stimulus: imbalance is created (room temp
decreases)
-Receptor: body detects the imbalance (thermostat detects the decrease in temp)
-Control Center: acts on the imbalance (thermostat acts on interpretation)
-Effector: imbalance is acted on (heater is turned on to warm the room)
What is the stimulus? - Answer The act of an imbalance/abnormal state
Negative Feedback - Answer Decrease/Increase in regulated variable that results in
Increase/Decrease variable, reduce output (until return to normal)
Positive Feedback - Answer Increases and reinforces initial stimulus; Increase in variable that
results in feedback that increases the variable
Example of Negative Feedback - Answer -Body Temperature
-Blood Glucose
-Blood Pressure
, Example of Positive Feedback - Answer -Childbirth
-Blood Clotting
Gradient - Answer More of something is more present in one area than another
Atomic mass - Answer Protons + Neutrons
Low Penetrance radioactive isotopes - Answer a (= 2 protons, + 2 neutrons) & b (electrons)
particles
High Penetrance radioactive isotopes - Answer y rays
Suspension - Answer Mixture containing two substances that are unevenly distributed and will
settle out as two separate substance
Colloids - Answer Two or more substances that are small and evenly distributed
Soulution - Answer Soulte + Solvent
Solvent - Answer (Water) What the solute dissolves in
Soute - Answer (salt) Substance being dissolved
Octet Rule - Answer Atom is most stable with 8 electrons in valence shell
Duet Rule - Answer (Atoms with 5 or fewer electrons) atom is most stable when valence shell
holds 2 electrons
Ions - Answer Unequal number of protons and electrons
Ionic bonds - Answer Transfer of electrons from a metal to a nonmetal
Non-polar covalent bonds (Strongest) - Answer Equal sharing of electrons between two
nonmetals
and All Solved Solutions 2026 Updated.
What are the 7 characteristics of life? - Answer 1. Homeostasis
2. Organization
3. Metabolism
4. Growth
5. Adaptation
6. Response to Stimuli
7. Reproduction
What are the major structural levels of organization of the body? - Answer 1. Chemical level
2. Cellular level
3. Tissue level
4. Organ level
5. Organ System level
6. Organism level
Describe the principle of Homeostasis - Answer -Stimulus: imbalance is created (room temp
decreases)
-Receptor: body detects the imbalance (thermostat detects the decrease in temp)
-Control Center: acts on the imbalance (thermostat acts on interpretation)
-Effector: imbalance is acted on (heater is turned on to warm the room)
What is the stimulus? - Answer The act of an imbalance/abnormal state
Negative Feedback - Answer Decrease/Increase in regulated variable that results in
Increase/Decrease variable, reduce output (until return to normal)
Positive Feedback - Answer Increases and reinforces initial stimulus; Increase in variable that
results in feedback that increases the variable
Example of Negative Feedback - Answer -Body Temperature
-Blood Glucose
-Blood Pressure
, Example of Positive Feedback - Answer -Childbirth
-Blood Clotting
Gradient - Answer More of something is more present in one area than another
Atomic mass - Answer Protons + Neutrons
Low Penetrance radioactive isotopes - Answer a (= 2 protons, + 2 neutrons) & b (electrons)
particles
High Penetrance radioactive isotopes - Answer y rays
Suspension - Answer Mixture containing two substances that are unevenly distributed and will
settle out as two separate substance
Colloids - Answer Two or more substances that are small and evenly distributed
Soulution - Answer Soulte + Solvent
Solvent - Answer (Water) What the solute dissolves in
Soute - Answer (salt) Substance being dissolved
Octet Rule - Answer Atom is most stable with 8 electrons in valence shell
Duet Rule - Answer (Atoms with 5 or fewer electrons) atom is most stable when valence shell
holds 2 electrons
Ions - Answer Unequal number of protons and electrons
Ionic bonds - Answer Transfer of electrons from a metal to a nonmetal
Non-polar covalent bonds (Strongest) - Answer Equal sharing of electrons between two
nonmetals
