BIO 253 Exam 1 UPDATED ACTUAL Exam
Questions and CORRECT Answers
In primary and secondary active transport, at least one substance will move against its -
CORRECT ANSWER - concentration gradient
The location of the binding sites on the Na-K pump dictates the _ of solute movement -
CORRECT ANSWER - direction
By which two modes of transport does glucose cross the cell membrane? - CORRECT
ANSWER - SAT and facilitated diffusion
Which transport processes can be saturated? - CORRECT ANSWER - anything with a
protein
Where is the Na/K ATPase found in the intestines? - CORRECT ANSWER - Basolateral
membrane
If a cell were to become depleted of its ATP, which type of membrane transport would be most
directly and immediately affected? - CORRECT ANSWER - PAT
As solute concentration of a solution increases, water concentration ___ and osmotic pressure
___ - CORRECT ANSWER - decreases, increases
Extracellular fluid becomes hypotonic and brain cells swell - CORRECT ANSWER -
water toxicity
Multi-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous
system - CORRECT ANSWER - lacks, dense
, In which muscle types does myosin have ATPase activity? - CORRECT ANSWER -
smooth, cardiac, skeletal
Which muscle fiber type experiences slow-wave potentials - CORRECT ANSWER -
smooth
Single-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous
system - CORRECT ANSWER - has, light
Contraction in smooth muscle is terminated when - CORRECT ANSWER - a phosphatase
dephosphorylates myosin
A molecule common to skeletal AND smooth muscle crossbridge cycling - CORRECT
ANSWER - actin
An overlap of cardiac action potential prevents - CORRECT ANSWER - summation
Why do we want to prevent summation? - CORRECT ANSWER - so the heart can fill
with blood
Three ways in which cardiac muscle is similar to smooth muscle - CORRECT ANSWER -
gap junctions, pacemaker cells, innervated by autonomic neurons
Contraction in smooth muscle is initiated when - CORRECT ANSWER - calcium binds to
calmodulin
In smooth muscle, actin and myosin generate force through the - CORRECT ANSWER -
crossbridge cycle
In smooth muscle, thick and thin filaments are arranged _ - CORRECT ANSWER -
obliquely
Questions and CORRECT Answers
In primary and secondary active transport, at least one substance will move against its -
CORRECT ANSWER - concentration gradient
The location of the binding sites on the Na-K pump dictates the _ of solute movement -
CORRECT ANSWER - direction
By which two modes of transport does glucose cross the cell membrane? - CORRECT
ANSWER - SAT and facilitated diffusion
Which transport processes can be saturated? - CORRECT ANSWER - anything with a
protein
Where is the Na/K ATPase found in the intestines? - CORRECT ANSWER - Basolateral
membrane
If a cell were to become depleted of its ATP, which type of membrane transport would be most
directly and immediately affected? - CORRECT ANSWER - PAT
As solute concentration of a solution increases, water concentration ___ and osmotic pressure
___ - CORRECT ANSWER - decreases, increases
Extracellular fluid becomes hypotonic and brain cells swell - CORRECT ANSWER -
water toxicity
Multi-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous
system - CORRECT ANSWER - lacks, dense
, In which muscle types does myosin have ATPase activity? - CORRECT ANSWER -
smooth, cardiac, skeletal
Which muscle fiber type experiences slow-wave potentials - CORRECT ANSWER -
smooth
Single-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous
system - CORRECT ANSWER - has, light
Contraction in smooth muscle is terminated when - CORRECT ANSWER - a phosphatase
dephosphorylates myosin
A molecule common to skeletal AND smooth muscle crossbridge cycling - CORRECT
ANSWER - actin
An overlap of cardiac action potential prevents - CORRECT ANSWER - summation
Why do we want to prevent summation? - CORRECT ANSWER - so the heart can fill
with blood
Three ways in which cardiac muscle is similar to smooth muscle - CORRECT ANSWER -
gap junctions, pacemaker cells, innervated by autonomic neurons
Contraction in smooth muscle is initiated when - CORRECT ANSWER - calcium binds to
calmodulin
In smooth muscle, actin and myosin generate force through the - CORRECT ANSWER -
crossbridge cycle
In smooth muscle, thick and thin filaments are arranged _ - CORRECT ANSWER -
obliquely
