-
Which of these is part of the cell membrane?
--Phospholipids
-
How do fat soluble molecules normally get into the cell?
--They dissolve in the fat layers of the membrane and enter the cell by diffusion
-
The phospholipids are unusual molecules because?
- -They have hydrophilic regions.
- -They have hydrophobic regions
-
Which statement best describes the �Fluid Mosaic Model� of the structures of the cell membrane?
--a double layer of lipid molecules with protein molecules suspended in the layer
-
The movement of chloride ions from an area where chloride is concentrated to an area where chloride is less concentrated is what?
--diffusion
-
If a cell has a solute concentration of 0.07% which of the solutions would be hypotonic in the cell?
--0.01% solute
-
Which of the following is necessary in order for osmosis to occur?
--A semi-permeable membrane
-
What is an example of a passive transport mechanism?
-
In an isotonic solution there will be?
--no net movement of water
-
The sodium potassium pump (which carries sodium out of a cell and potassium into cells) is an example of?
--active transport
-
The process of a cell engulfing a solid object is:
--phagoctosis
-
What is likely to happen when a plant cell is place in pure water?
--it becomes turgid
-
When a cell bursts due to osmosis, it is in a solution that is:
--Hypotonic
-
Why do plant cells behave differently then animal cells when places in a hypotonic solution?
--Plants have a cell wall
-
ADP + inorganic phosphate ?
--ATP
-
The net yield of ATP in glycolysis (ATP/glucose) in the presence of arsenate (AsO4 2- ) instead of phosphate is?
-- (-2)
-
The regulation of the glycolytic pathway involves?
- --feedback by ATP
- --Allosteric inhibition by ATP
- --Allosteric stimulation by ADP
-
Phosphoructosekinase, the major flux-controlling enzyme of glycolysis is allosterically inhibited by __________ and activated by ______________.
--ATP & ADP
-
In eukaryotic cell, the enzymes of glycolsis are located in the
--cytosol
-
The glycolytic pathway (Glucose? pyruvate ) is found?
--In all living organisms
-
The facilitated diffusion of glucose into erythrocytes uses a mechanism called?
--symport
-
The active transport of NA+ and K+ by the membrane Na+-K+ pump uses energy from?
--ATP hydrolysis to ADP and Pi
-
What molecule cannot move directly through the membrane by simple diffusion?
--H2O
-
Pyruvate, then end product of glycolysis, enters the citric acid cycle after is have en converted to?
--Acetyl CoA
-
Most of the ATP made during cellular respiration is generated by?
--Oxidative phosphorylation
-
Which is not a substrate for hexokinase?
--galactose
-
What is not a potential end product of fermentation?
- a)ethanol
- b)pyruvate
- c) lactate
- d) Acetaldehyde
- e) B& d
-
Phosphoructosekinase (PFK-1) is allosterically regulated. Which of the following is not a regulatory effect?
--Protons activated by PFK-1
-
The effects f fructose-1, 6-bisphosphate on pyruvate kinase is an example of?
--activation by phospohrylation
-
Electrons stripped from glucose during the glycolysis and the Krebs cycle is transported to the electron transport chain by?
--NADH
-
What is given off as a by-product of cellular respiration during the conversion of pyruvic acid (a 3 carbon molecule) into acetyl-coA (a two carbon molecule?)
--CO2
-
At the end of the electron transport chain, the final acceptor of electrons is______, which produces a molecule of ______?
--O2/CO2
-
Which of the following molecules serves as an intermediate electron carrier in the process of respiration?
-
In the first few steps o f glycolysis, two ATP molecules are actually �used up� instead of produced. Why do you think that this energy must be added to the glucose molecule first before the ultimate harvest of 36 ATP molecules can be attained?
--Glucose is a stable molecule. A certain amount of �activation� energy must be added before the molecule will release all of its stored energy.
-
During alcoholic fermentation, molecule of glucose will be converted in:
--2 ethanol+ 2CO2 + 2NAD+
-
Glycolysis takes place in the?
--cytosol
-
The process of cellular respiration can be written as a chemical equation. Which is the correct equation?
--C6H12O6 + 6O2 + ADP ? 6 CO2 + 6H2O + ATP
-
What is a correct statement about transport across a membrane? The movement of:
--glucose across cell membrane involves binding with a carrier protein in the membrane.
-
Regarding the sodium, potassium pump:
- --energy from ATP is directly used to move the sodium and potassium
- --More sodium ions are pumped into the cell and potassium ions are pumped out.
-
The enzyme that catalyses the conversion of succinate to fumarate is?
--fumarate hydrase
-
When isocitrate (6 carbons) is converted to alpha-ketogluterate, the subproduct (s) of the reaction is/are:
--A molecule of CO2 and a molecule of NADH are produced
-
The Krebs cycle is also known as the TCA cycle because:
--Citrate contains three carboxylic acid groups.
-
The electron transport system consists of five kinds of carriers. Chemically speaking they are:
--all proteins except Q�which is a lipid.
-
The enzyme pyruvate dehydrogenase is negatively regulated (inhibited) by:
-
The enzyme hexokinase is inhibited by:
--Glucose-6-phosphate.
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