1.If a membrane transport protein sends compound A out of the cell while bringin
ID: 78023 • Letter: 1
Question
1.If a membrane transport protein sends compound A out of the cell while bringing compound B into the cell with the hydrolysis of ATP, this transporter would be
A. a secondary active transporter.
B. an active symporter.
C. a passive symporter.
D. an active antiporter.
2. Which of these signal transduction components is a second messenger?
A. glucagon
B. G-protein coupled receptor
C. cAMP
D. protein kinase A
E. receptor tyrosine kinase
3. Because hemoglobin is tetrameric
A. it binds oxygen more tightly than myoglobin.
B. it’s oxygen binding curve is a rectangular hyperbola.
C. it cannot be regulated by allosteric control.
D. it can bind oxygen cooperatively.
E. None of the above.
4. Which statement is false concerning the fate of glucose-6-phosphate in a muscle cell?
A. G-6-P can be incorporated into glycogen.
B. G-6-P can enter the pentose phosphate pathway.
C. G-6-P can be converted to glucose.
D. G-6-P can enter glycolysis.
5. The net effect of the eight steps of the citric acid cycle is to
A. completely oxidize an acetyl group to carbon dioxide.
B. convert pyruvate to acetyl CoA.
C. produce a citrate molecule
D. produce 2 ATP for every pass through the cycle.
E. More than one of the above
Explanation / Answer
1. D. an active antiporter.
Antiporter is an integral membrane protein involved in transport of two or more different molecules or ions across a membrane in opposite directions.
2. C. cAMP.
Examples of second messenger molecules include cyclic AMP, cyclic GMP, inositol trisphosphate, diacylglycerol, and calcium.
3. D. it can bind oxygen cooperatively.
4.D. G-6-P can enter glycolysis.
5. A. completely oxidize an acetyl group to carbon dioxide.
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