which of the following is an example of facilitated diffusion?\nglucose entering a cell with the help of the…

which of the following is an example of facilitated diffusion?\nglucose entering a cell with the help of the transport molecule insulin\noxygen passing through a cell membrane from a high concentration to a low concentration\nall of these\npotassium entering a cell via a special channel that requires energy

which of the following is an example of facilitated diffusion?\nglucose entering a cell with the help of the transport molecule insulin\noxygen passing through a cell membrane from a high concentration to a low concentration\nall of these\npotassium entering a cell via a special channel that requires energy

Answer

Brief Explanations:

Facilitated diffusion is a type of passive transport (no energy required) where molecules move across the cell membrane with the help of transport proteins.

  • Glucose entering a cell with the help of the transport molecule (insulin is a hormone that signals the presence of glucose, but the actual transport molecule for glucose in facilitated diffusion is a glucose transporter like GLUT - this option is incorrect as it misidentifies the transport molecule).
  • Oxygen passing through a cell membrane from a high concentration to a low concentration is simple diffusion (no transport protein needed).
  • Potassium entering a cell via a special channel that requires energy is active transport (as it requires energy).

Answer:

None of the options are correct. But if we assume the first option had the correct transport protein (e.g., GLUT instead of insulin), then "Glucose entering a cell with the help of the transport molecule [correct transporter]" would be an example of facilitated diffusion. However, based on the given options and standard definitions:

  • The first option has an error (insulin is not a transport molecule for glucose in facilitated diffusion).
  • The second option is simple diffusion.
  • The third option is incorrect as not all are correct.
  • The fourth option is active transport.

If we strictly follow the options and assume a mis - naming in the first option (taking it as a transport - protein - mediated glucose entry), then the first option (with the correction in mind) is an example of facilitated diffusion. But as per the given text in the options, there is an error in the first option's description. If we ignore the mis - naming of the transport molecule (assuming it's a general "transport molecule" meant for facilitated diffusion), then "Glucose entering a cell with the help of the transport molecule insulin" (with the understanding that it's a mis - label for a transport protein) is the closest to facilitated diffusion among the given options.