NAU BIO 344 Posner Final Exam Questions and Answers with complete solution
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NAU BIO 344 Posner
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NAU BIO 344 Posner
Reactions that add a phosphate to specific sites on proteins in an ATP dependent
manner are important in cell signaling. The type of enzyme that catalyzes this reaction
is: - ️️a protein kinase
What secondary structure found in proteins is often used to enable it to cross a
membrane? - ️�...
NAU BIO 344 Posner Final Exam
Reactions that add a phosphate to specific sites on proteins in an ATP dependent
manner are important in cell signaling. The type of enzyme that catalyzes this reaction
is: - ✔️✔️a protein kinase
What secondary structure found in proteins is often used to enable it to cross a
membrane? - ✔️✔️alpha helices
An inhibitory acetylcholine receptor would - ✔️✔️be a K+ channel
The nonpolar part of a phospholipids consists of - ✔️✔️fatty acid chains
Which of the following is true concerning passive transport and active transport: -
✔️✔️passive transport transfers molecules down an electrochemical gradient while
active transport transfers molecules against an electrochemical gradient
An example of an amphiphilic phosphoglyceride is: - ✔️✔️phosphatidlyserine
In a depolarized membrane, repolarization of the neural membrane would occur as a
result of: - ✔️✔️opening of K+ channels
How does an action potential travel down an axon? - ✔️✔️voltage gated Na+ channels
go from closed to open to inactivated in an orchestrated sequential manner
In a polarized cell, a barrier is created by a specific type of intercellular junction that
maintains the separation of membrane proteins and between the apical and the basal
sides of the cell. This barrier is called a: - ✔️✔️tight junction
In the presynaptic nerve cell, opening of voltage gated Ca+2 channels at the nerve
terminal leads to: - ✔️✔️exocytosis of the contents of secretory vesicles into the
synaptic cleft
The Na+-K+ pump requires ______ molecule(s) of ATP to transport ______ Na+ ions
out of the cell and _______ K+ ions into the cell. - ✔️✔️1, 3, 2
Phospholipase C and Phospholipase A1 differs differ - ✔️✔️in the specific site where
they cleave phospholipids
Which of the following are used to transport K+ ions against their electrochemical
gradient? - ✔️✔️the sodium potassium pump
, Phosphatidylinositol 3-Kinase (also known as PI3K) is a lipid kinase. The 3 is letting you
know that: - ✔️✔️it catalyzes the addition of a phosphate to the 3 position of the inositol
ring.
A glycolipid that is part of the plasma membrane will be found: - ✔️✔️only on the side
of the bilayer that faces away from the cell (towards the extracellular fluid)
When transporting a negatively charged ion through a ligand gated ion channel across
the plasma membrane, which of the following is True? - ✔️✔️the direction of transport
is determined by both the concentration gradient and the membrane potential
Both lipid and protein molecules can diffuse in the plane of a membrane. This is referred
to as: - ✔️✔️Lateral diffusion
The forces that hold together the lipids in the membranes that surround organelles are: -
✔️✔️Non-Covalent interactions
A prokaryotic organism is isolated from a hydrothermal vent in Yellowstone national
park where despite the fact that the temperature is extremely high, it has been thriving.
In the plasma membrane of such an organism, which of the following concerning its
phospholipid composition will help it adapt to the high temperature of its environment? -
✔️✔️a predominance of long chain saturated fatty acids
The reason that an action potentials cannot move backward is: - ✔️✔️voltage gated
sodium ion channels cannot go directly from the inactive state to open
The sodium potassium pump is a - ✔️✔️P-type ATPase
The plasma membrane of an animal cell will contain which of the following: -
✔️✔️proteins
Which of the following causes a kink (or bend) in the fatty acid chains in a lipid molecule
- ✔️✔️double bonds
The reaction that converts PI 4,5 bisphosphate (PI(4,5)P2) to PI 3,4,5 trisphosphate
(PI(3,4,5)P3) in an ATP dependent manner is an important reaction in cell signaling.
The enzyme that catalyzes this reaction is: - ✔️✔️PI 3-kinase
An example of an ABC transporter is: - ✔️✔️MDR (multi-drug resistance protein)
Opening of a voltage gated potassium ion (K+) channel - ✔️✔️shifts the membrane
potential toward a more negative value
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