Unit 1 (Lecture Quizzes) Flashcards
Which of the following molecules enters kidney cells via a specific transporter?
a) Cholesterol
b) Carbon dioxide gas
c) Ethanol
d) Oxygen
e) Water
e) Water
Of the following molecules, which would you predict diffuses most readily across membranes?
a) Water
b) Oxygen
c) Hydrogen ions
d) Serine
e) Glucose
b) Oxygen
The composition of lipids in the outer and inner monolayers of cell membrane lipid bilayers is
a) twice as concentrated in the inner monolayer as in the outer monolayer.
b) highly random for each monolayer.
c) the same for all cell plasma membranes but different from the composition in mitochondrial and chloroplast membranes.
d) asymmetrical; i.e., different in each monolayer.
e) identical in each monolayer.
d) asymmetrical; i.e., different in each monolayer.
Which of the following protein types would you predict is defective in kidney water balance disorders?
a) ATPase
b) Anion exchange protein
c) Aquaporin
d) Porin
e) GLUT
c) Aquaporin
One way in which ions are specifically transported into the cell is via
a) ABC transporters.
b) gated channels.
c) uniport transporters.
d) carrier permeasproteins.
e) simple diffusion.
b) gated channels.
Each of the following is a function of membranes except
a) defining cell and organelle boundaries
b) information storage.
c) sites for specific biochemical functions.
d) cell—cell communication.
e) regulation of transport.
b) information storage.
The most prominent lipids in animal cell membranes are
a) phytosterol
b) glycolipids
c) cerebrosides
d) phospholipids.
e) cholesterol
d) phospholipids.
Each of the following molecules move across membranes by simple diffusion except
a) carbon dioxide.
b) fatty acids.
c) water
d) glucose
e) oxygen
d) glucose
Where is triacyl glycerol synthesized?
a) In between the two layers of the ER membrane
b) In the mitochondria, in between the two membranes
c) in the cytoplasm
d) Everywhere
e) In the lumen of the smooth ER
a) In between the two layers of the ER membrane
GluT4 is the main glucose importer. Where do you think the binding site for glucose is?
a) In the extracellular portion
b) In the phospholipids
c) In the transmembrane region
d) In the mitochondrial side
e) In the hydrophobic side
a) In the extracellular portion
The breakdown of glucose to pyruvate by a cell is an example of what type of reaction?
a) Aerobic
b) Synthetic
c) Apoptotic
d) Catabolic
e) Anabolic
d) Catabolic
NAD+
a) is the reduced form of the B vitamin niacin.
b) releases a phosphate to become NADH.
c) is an electron source for biological oxidation reactions.
d) is a coenzyme acceptor of electrons and a hydrogen ion
e) is derived from vitamin E.
d) is a coenzyme acceptor of electrons and a hydrogen ion
Which of the following statements best describes the role of NAD+/NADH in glycolysis?
a) NADH is used to directly create the phosphoanhydride bonds in ATP.
b) NAD+ accepts electrons.
c) NADH accepts electrons during fermentation.
d) NADH is used primarily in substrate-level phosphorylation
e) All of the above are correct.
b) NAD+ accepts electrons.
Each of the following is a substrate for glycolysis except
a) galactose
b) mannose
c) lactose
d) fructose
e) All are substrates
e) All are substrates
Pyruvate is converted to acetyl CoA through the action of
a) acetyl-CoA Synthase
b) pyruvate dehydrogenase
c) aconitase
d) citrate synthase.
e) pyruvate decarboxylase
b) pyruvate dehydrogenase
