48) 48) Select the statement that best describes the mechanism of the Na+/glacos
ID: 213631 • Letter: 4
Question
48) 48) Select the statement that best describes the mechanism of the Na+/glacose t and A) Na+ moves with its gradient to drive the transport of glacose against its gradient. Both Na glucose are moving into the cell. moves with its gradient to drive the transport of Na+ against its gradient. Both Na and Both Na C) Nat moves it moves with its gradient to drive the transport of glucose against its gradient. D) Nat moves into the cell with its gradient to drive the transport of glucose out of the cell agaimst its E) Glucose moves into the cell with its gradient to drive the transport of Nat out of the glucose are moving out of the cell. gradient gradient 49) B) False 49) True or False: Enzymes speed up the rate of a reaction by increasing the AG of the reaction. A) True 50) phosphorylation and dephosphorylation of lamin proteins. When lamins are phosphorylated, the consequent conformation change weakens the binding between the proteins, causing the structures to fall apart. Dephosphorylation at the end of mitosis causes lamins to reassemble. 50) Disassembly and reassembly of the nuclear lamina during cell division is controlled by the B) phosphatases D) both B and C Which types of proteins are involved in the reassembly of lamins? C) kinasesExplanation / Answer
48. Na+ moves with its gradient to drive the transport of glucose against its gradient. Both Na+ and glucose moves into the cell.
The sodium driven-glucose symporter uses the potential free energy stored in the sodium electrochemical gradient ie low sodium concentration inside the epithelial cells which is established by Sodium-potassium pump. Therefore, the sodium influx from the lumen to the epithelial cell is coupled with glucose transport.
49. FALSE.
When delta G increases, reaction needs energy to happen and when delta G decreases, reaction occurs spontaneously. Therefore enzymes do not increase delta G.
50. B. Phosphatases.
After chromosome segregation, dephosphorylation of nuclear lamins by a phosphatase promotes reassembly of the nuclear envelope.
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