MASTERING BIO 253 EXAMS: A+ GRADED GUIDE WITH
LATEST QUESTIONS AND ANSWERS.
In primary and secondary active transport, at least one substance will move against its
concentration gradient
The location of the binding sites on the Na-K pump dictates the _ of solute movement
direction
By which two modes of transport does glucose cross the cell membrane?
SAT and facilitated diffusion
Which transport processes can be saturated?
anything with a protein
Where is the Na/K ATPase found in the intestines?
Basolateral membrane
If a cell were to become depleted of its ATP, which type of membrane transport would be most
directly and immediately affected?
PAT
As solute concentration of a solution increases, water concentration ___ and osmotic pressure ___
decreases, increases
Extracellular fluid becomes hypotonic and brain cells swell
water toxicity
Multi-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous system
lacks, dense
In which muscle types does myosin have ATPase activity?
smooth, cardiac, skeletal
Which muscle fiber type experiences slow-wave potentials
smooth
Single-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous system
has, light
Contraction in smooth muscle is terminated when
a phosphatase dephosphorylates myosin
, A molecule common to skeletal AND smooth muscle crossbridge cycling
actin
An overlap of cardiac action potential prevents
summation
Why do we want to prevent summation?
so the heart can fill with blood
Three ways in which cardiac muscle is similar to smooth muscle
gap junctions, pacemaker cells, innervated by autonomic neurons
Contraction in smooth muscle is initiated when
calcium binds to calmodulin
In smooth muscle, actin and myosin generate force through the
crossbridge cycle
In smooth muscle, thick and thin filaments are arranged _
obliquely
Smooth muscles have _ sarcoplasmic reticulum than skeletal muscles
less
The second messenger DAG is
membrane bound
Ligands that bind to target cell receptors but don't initiate response
antagonists
Fastest acting membrane-bound receptors
channel-linked
Slow ligand-gated channels are regulated by
g proteins
G proteins are enzymes that allow for an ___ ___ within a target cell
amplified response
What happens once adenylate cyclase is activated
it uses ATP to form cAMP
You can inhibit cAMP by activating
LATEST QUESTIONS AND ANSWERS.
In primary and secondary active transport, at least one substance will move against its
concentration gradient
The location of the binding sites on the Na-K pump dictates the _ of solute movement
direction
By which two modes of transport does glucose cross the cell membrane?
SAT and facilitated diffusion
Which transport processes can be saturated?
anything with a protein
Where is the Na/K ATPase found in the intestines?
Basolateral membrane
If a cell were to become depleted of its ATP, which type of membrane transport would be most
directly and immediately affected?
PAT
As solute concentration of a solution increases, water concentration ___ and osmotic pressure ___
decreases, increases
Extracellular fluid becomes hypotonic and brain cells swell
water toxicity
Multi-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous system
lacks, dense
In which muscle types does myosin have ATPase activity?
smooth, cardiac, skeletal
Which muscle fiber type experiences slow-wave potentials
smooth
Single-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous system
has, light
Contraction in smooth muscle is terminated when
a phosphatase dephosphorylates myosin
, A molecule common to skeletal AND smooth muscle crossbridge cycling
actin
An overlap of cardiac action potential prevents
summation
Why do we want to prevent summation?
so the heart can fill with blood
Three ways in which cardiac muscle is similar to smooth muscle
gap junctions, pacemaker cells, innervated by autonomic neurons
Contraction in smooth muscle is initiated when
calcium binds to calmodulin
In smooth muscle, actin and myosin generate force through the
crossbridge cycle
In smooth muscle, thick and thin filaments are arranged _
obliquely
Smooth muscles have _ sarcoplasmic reticulum than skeletal muscles
less
The second messenger DAG is
membrane bound
Ligands that bind to target cell receptors but don't initiate response
antagonists
Fastest acting membrane-bound receptors
channel-linked
Slow ligand-gated channels are regulated by
g proteins
G proteins are enzymes that allow for an ___ ___ within a target cell
amplified response
What happens once adenylate cyclase is activated
it uses ATP to form cAMP
You can inhibit cAMP by activating
