Final Exam- BIOS 251 Questions with Complete
Solutions
Components of the homeostatic control loop Correct Answer-receptor, control center,
effector
Negative feedback Correct Answer--works to oppose change
-brings condition back to a set point
Positive feedback Correct Answer--works to enhance change
-brings condition further away from a set point
Tonicity Correct Answer-relates to how the solution influences the shape of body cells
Hypotonic solution Correct Answer-RBC undergoes hemolysis (swelling)
Hypertonic solution Correct Answer-RBC undergoes crenation (shrinking)
Osmosis Correct Answer--concentration of solutes per liter
-water moves from high concentration of water to low concentration of water
, Final Exam- BIOS 251 Questions with Complete
Solutions
Factors that influence diffusion across a cell membrane Correct Answer--steepness of
concentration gradient
-temperature
-mass of diffusing substance
-surface area
-diffusion distance
Passive processes that move substances across the cell membrane Correct Answer--Simple
diffusion
-Facilitated diffusion
Osmosis processes that move substances across the cell membrane Correct Answer--Active
processes
-Active transport
-Vesicular transport
, Final Exam- BIOS 251 Questions with Complete
Solutions
Primary active transport Correct Answer-energy derived from ATP changes the shape of a
transporter protein which pumps a substance across a plasma membrane against its
concentration gradient
Secondary active transport Correct Answer--energy stored (in a hydrogen or sodium
concentration gradient) is used to drive other substances against their own concentration
gradients
-substance is being transported "against its will"
Types of active transport in vesicles Correct Answer--endocytosis
-phagocytosis
-pinocytosis
-exocytosis
-transocytosis
Endocytosis Correct Answer-cell takes up specific ligands that bind to cell surface receptors
into a vesicle
Solutions
Components of the homeostatic control loop Correct Answer-receptor, control center,
effector
Negative feedback Correct Answer--works to oppose change
-brings condition back to a set point
Positive feedback Correct Answer--works to enhance change
-brings condition further away from a set point
Tonicity Correct Answer-relates to how the solution influences the shape of body cells
Hypotonic solution Correct Answer-RBC undergoes hemolysis (swelling)
Hypertonic solution Correct Answer-RBC undergoes crenation (shrinking)
Osmosis Correct Answer--concentration of solutes per liter
-water moves from high concentration of water to low concentration of water
, Final Exam- BIOS 251 Questions with Complete
Solutions
Factors that influence diffusion across a cell membrane Correct Answer--steepness of
concentration gradient
-temperature
-mass of diffusing substance
-surface area
-diffusion distance
Passive processes that move substances across the cell membrane Correct Answer--Simple
diffusion
-Facilitated diffusion
Osmosis processes that move substances across the cell membrane Correct Answer--Active
processes
-Active transport
-Vesicular transport
, Final Exam- BIOS 251 Questions with Complete
Solutions
Primary active transport Correct Answer-energy derived from ATP changes the shape of a
transporter protein which pumps a substance across a plasma membrane against its
concentration gradient
Secondary active transport Correct Answer--energy stored (in a hydrogen or sodium
concentration gradient) is used to drive other substances against their own concentration
gradients
-substance is being transported "against its will"
Types of active transport in vesicles Correct Answer--endocytosis
-phagocytosis
-pinocytosis
-exocytosis
-transocytosis
Endocytosis Correct Answer-cell takes up specific ligands that bind to cell surface receptors
into a vesicle
