One Substance Has No Membrane Transporters to Move It but Can

question 53

Multiple Choice

One substance has no membrane transporters to move it but can diffuse freely through open leak channels if there is a concentration gradient.Initially, this substance's concentrations in the filtrate and extracellular fluid are equal.Later, however, the active transport of Na⁺ and other solutes creates a gradient by removing water from the lumen of the tubule where it is located.What substance is this?

• A) glucose
• B) calcium
• C) urea
• D) glucose and calcium
• E) glucose, calcium, and urea

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Definitions:

Put Option

A financial agreement granting the holder the option, but no requirement, to sell a certain quantity of an underlying asset at a predetermined price during a defined period.

Forward Contract

An individualized agreement for the purchase or sale of an asset at an agreed-upon price on a specific future date between two parties.

Swap Contract

Swap Contract is a financial agreement to exchange cash flows or other financial instruments between two parties at specified future dates.

Interest Rate Floor

A derivative contract that provides a minimum interest rate protection to investors, ensuring rates do not fall below a specified level.