Which of the following scenarios likely describes an uniporter? This transporter

Question

Which of the following scenarios likely describes an uniporter? This transporter moves both protons and lactose into bacterial cells. This transporter allows K+ ions to flow down their concentration gradient when the voltage of the membrane changes. This transporter is responsible for maintaining high [Na+] outside the cell and high [K+] inside the cell This transporter allows water to flow into or out of cells with the direction of flow depending only on the direction of the osmotic gradient across the membrane. This transporter moves ATP into the cytosol and ADP into the mitochondrial matrix.

Explanation / Answer

1) A uniporter is an integral membrane protein that is involved in facilitated diffusion.Uniporter carrier proteins binding to one molecule of a substrate at a time and transporting it with its concentration gradient.

2) Property of Ras

- it is a single subunit protein having relatively small G protein. it has intrinsic GTPase activity and can bind either GDP or GTP. Ras activation leads to activation of Protein Kinase C.

Property of Beta-adrenergic Gs

- it is a heterotrimeric protein which has intrinsic GTPase activity and can bind either GDP or GTP. its activation leads to activation of adenylyl cyclase enzyme.

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