What Makes a Semipermeable Membrane Selective for One Chemical Species

question 51

Multiple Choice

What makes a semipermeable membrane selective for one chemical species but not another?

• A)The pores in the membrane select by size,they are big enough for water only.
• B)The material is hydrophilic and therefore only allows water through.
• C)The material is hydrophobic and therefore only allows water through.
• D)The material chemically reacts with everything but water.
• E)none of the above

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Definitions:

DNA Binding Sites

Specific sequences in the DNA to which proteins such as transcription factors can bind, influencing the regulation of genes.

Activators

Molecules that increase the activity of enzymes or other proteins, often playing critical roles in metabolic and signaling pathways.

Silencers

Devices attached to or part of the barrel of firearms that reduce the noise, muzzle flash, and recoil when the gun is fired.

Transcription

The process of copying a segment of DNA into RNA, which can be used to produce proteins.