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Cell Exam 2

exam 2

QuestionAnswer
The turnover number for an enzyme is derived directly from the value of the Km. False
Transerve movement of lipids in a membrane is much more common and rapid than lateral movement of lipids in a membrane. False
Even though the exact amount of proteins and the exact amount of lipids w/in a membrane can vary, the ratio of protein to lipid is always the same. False
The ABO blood grouping molecules are glycolipids. True
Sphingomyelin is a type of sterol. False
Most glycolipids are sphingosine based, not glyceral based. True
Sterols (like cholesterol), are found in the membranes of most prokaryotic cells. False
The Na+/K+ pump is an example of a P-type ATPase True
Some G-proteins are trimeric, some G-proteins are pentameric False
The membrane of the TGN is a thicker membrane than the CGN True
Growth factors are more likely to interact with G-protein receptors rather than kinase receptors False
Phospholipid synthesis occurs on the cytoplasmic side of the SER membrane bilayer True
The RER is more tube-like, the SER is more sac-like False
Lipid anchored proteins are difficult to remove from a membrane and would require detergents or oganic solvents to so do True
Animal fats are more highly saturated than plant fats True
The size limit for molecules that could potentially move across a membrane by simple diffusion is around 1000 daltons, i.e. anything less than 1000 daltons can pass through by simple diffusion (nonpolar and not charged) False
The marker enzyme for the SER? Glucose-6-phosphate
In the G-protein receptor mechanism, what has to be bound to the G-protein to turn it "off"? GDP
An activated G protein can turn on this enzyme resulting in higher levels of cAMP w/in the cell Adenylyl cyclose
cAMP is a 2nd messenger that commonly functions by activating this enzyme protein kinase A
In N-linked glycosylation, sugar is added to amine group of the amino acid __? Asparagine
The term that applies to both the layers/folds of he RER and the layers/folds of the Golgi cisternae
This 2nd messenger causes the release of calcium ion from intracellular stores insitol trisphosphate
These vesicles are involved witht the transport of proteins from one layer of the Golgi complex to the next shuttle vesicles
What is the targeting signal for hydrolytic enzymes destined for lysosomes? mannose-6-phosphate
This term refers to the general directional flow of materials and vesicles from the RER to the Golgi and out of the cell Anterograde
__ endosomes are the immediate precursors to lysosomes. Late
The type of enocytosis where solid structure >0.5um are taken into the cell Phagocytosis
The SER contains enzymes that are __ toxic substances increasing thier solubility making it more probable that the toxic substance will then get secreted in the urine. Hydroxylate
this type of lysosome is specialized in digesting internal self cellular components Autophagic
Requires an integral membrane protein Active Transport Facilitated Diffusion
Doubling the concentration of the molecule to be transported will double the rate of transport (linear relationship) Simple Diffusion
Osmosis Simple Diffusion
GLUT1 Facilitated Diffusion
Sodium entering an intestinal cell from the intestinal lumen Facilitated Diffusion
Requires Energy Active transport
Glucose entering an intestinal cell from the intestinal lumen Facilitated Diffusion
Movement from a high concentration to low concentration Simple Diffusion Facilitated Diffusion
The Na+/K+ pump Active Transport
Ions will not enter or leave a cell by this mechanism Simple Diffusion
Created by: jd56138
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