BIO 2301 Exam One UPDATED ACTUAL
Exam Questions and CORRECT Answers
homeostasis - CORRECT ANSWER - a state of equilibrium, as in an organism or cell,
maintained self-regulating process
4 components of homeostatic control mechanism? - CORRECT ANSWER - variable,
receptor, control center, effector
variable (homeostatic control center) - CORRECT ANSWER - some factor the body must
control
control center (homeostasis) - CORRECT ANSWER - contains set point and directs the
body's response
effector (homeostatic control center) - CORRECT ANSWER - carries out the response to
fix/effectively change the deviated variable
receptor (homeostatic control center) - CORRECT ANSWER - measures/detects changes
to the variable
negative feedback - CORRECT ANSWER - maintains homeostasis by responding to a
change (with receptor)
positive feedback - CORRECT ANSWER - normal responses; will respond to change in a
variable by causing a greater change in the same direction
negative feedback example: AC set to 70, but it is 100 outside, when air from outside gets in,
what does AC do? - CORRECT ANSWER - AC turns on to bring temperature back to 70
, is blood clotting negative or positive feedback? - CORRECT ANSWER - positive
is blood pressure is high, how does body return to homeostasis? - CORRECT ANSWER -
lower heart rate, which lowers BP
if blood glucose is low, how does body return to homeostasis? - CORRECT ANSWER -
release a hormone (glucagon) to raise blood glucose levels
if body temp. is high, how does body return to homeostasis? - CORRECT ANSWER -
shiver/vasoconstrict blood vessels to skin, raising body temp.
after eating something salty, blood sodium levels rise, how does the body return to homeostasis?
- CORRECT ANSWER - releases hormone (ANF) which causes kidneys to excrete
sodium
what does the cell membrane consist of? - CORRECT ANSWER - protein, phospholipids,
cholesterol, and carbs
polar molecules - CORRECT ANSWER - small charge
nonpolar molecules - CORRECT ANSWER - no charge
ampipathic - CORRECT ANSWER - molecules with nonpolar and polar regions
phospholipid - CORRECT ANSWER - polar head (hydrophilic), nonpolar tail
(hydrophobic)
2 types of proteins responsible for specialized functions of the membrane? - CORRECT
ANSWER - integral and peripheral
Exam Questions and CORRECT Answers
homeostasis - CORRECT ANSWER - a state of equilibrium, as in an organism or cell,
maintained self-regulating process
4 components of homeostatic control mechanism? - CORRECT ANSWER - variable,
receptor, control center, effector
variable (homeostatic control center) - CORRECT ANSWER - some factor the body must
control
control center (homeostasis) - CORRECT ANSWER - contains set point and directs the
body's response
effector (homeostatic control center) - CORRECT ANSWER - carries out the response to
fix/effectively change the deviated variable
receptor (homeostatic control center) - CORRECT ANSWER - measures/detects changes
to the variable
negative feedback - CORRECT ANSWER - maintains homeostasis by responding to a
change (with receptor)
positive feedback - CORRECT ANSWER - normal responses; will respond to change in a
variable by causing a greater change in the same direction
negative feedback example: AC set to 70, but it is 100 outside, when air from outside gets in,
what does AC do? - CORRECT ANSWER - AC turns on to bring temperature back to 70
, is blood clotting negative or positive feedback? - CORRECT ANSWER - positive
is blood pressure is high, how does body return to homeostasis? - CORRECT ANSWER -
lower heart rate, which lowers BP
if blood glucose is low, how does body return to homeostasis? - CORRECT ANSWER -
release a hormone (glucagon) to raise blood glucose levels
if body temp. is high, how does body return to homeostasis? - CORRECT ANSWER -
shiver/vasoconstrict blood vessels to skin, raising body temp.
after eating something salty, blood sodium levels rise, how does the body return to homeostasis?
- CORRECT ANSWER - releases hormone (ANF) which causes kidneys to excrete
sodium
what does the cell membrane consist of? - CORRECT ANSWER - protein, phospholipids,
cholesterol, and carbs
polar molecules - CORRECT ANSWER - small charge
nonpolar molecules - CORRECT ANSWER - no charge
ampipathic - CORRECT ANSWER - molecules with nonpolar and polar regions
phospholipid - CORRECT ANSWER - polar head (hydrophilic), nonpolar tail
(hydrophobic)
2 types of proteins responsible for specialized functions of the membrane? - CORRECT
ANSWER - integral and peripheral
