Quiz 3 Flashcards
Which of these is true for lipid molecules that move from one leaflet to another?
The process requires energy and the flippase enzyme.
The rate of diffusion of a molecule across a membrane will be inversely proportional to:
Thickness of the membrane.
By which process do oxygen molecules cross membranes?
Diffusion across the lipid bilayer.
If there is a rise in sodium concentration outside of a cell with open chloride channels, in what direction are the chloride ions and water expected to move across the plasma membrane?
Both chloride ions and water will move out of the cell.
The inhibition of the enzyme phosphofructo kinase-1 by citrate is an example of
uses an organic molecule as a final electron acceptor.
What is the purpose of CoA?
To form an unstable molecule Acetyl-CoA that readily donates its 2C-acetyl group to oxaloacetate.
Which of these produces carbon dioxide?
_____________ is a small vesicle that is derived from fragmented ER produced when cells are homogenized.
The Sec61 complex forms _____________ within the ER membrane.
Precursor proteins destined for this organelle retain their targeting signal after transport across the organelle’s two membranes:
Posttranslational glycosylation of proteins is inhibited specifically by:
Perioxisomal matrix proteins
undergo post-translational import into perioxisomes
Transmembrane proteins of which of these organelles is synthesized on cytosolic ribosomes:
The _________ protein forms general import pore which is a large passive channel through the outer mitochondrial membrane.