Question

biomolecules and cells review
a monomer is
a polymer is
which statements best compare a function of proteins and lipids in a human cell?
a proteins provide energy for cellular processes. lipids catalyze chemical reactions inside the cell.
b proteins catalyze chemical reactions inside the cell. lipids allow for the transport of certain molecules into and out of the cell.
c proteins allow for the transport of certain molecules into and out of the cell. lipids store genetic information for cells.
d proteins store genetic information for cells. lipids provide energy for cellular processes.
circle the correct answer to the left, and then write the justification below.

Explanation:

• Option A: Proteins do not primarily provide energy (carbohydrates are the main energy - providing biomolecules for quick energy, and lipids for long - term energy). Lipids do not catalyze chemical reactions; enzymes (which are proteins) do.
• Option B: Proteins (such as enzymes) can catalyze chemical reactions. Lipids (in the form of phospholipids in the cell membrane) do not directly allow for molecule transport. Transport proteins (a type of protein) allow for the transport of certain molecules into and out of the cell.
• Option C: Transport proteins (a type of protein) allow for the transport of certain molecules into and out of the cell. Lipids do not store genetic information; nucleic acids (DNA and RNA) store genetic information.
• Option D: Proteins do not store genetic information (nucleic acids do). Lipids (fats, oils) are long - term energy storage molecules. Carbohydrates are for short - term energy.

Answer:

None of the options are completely correct. However, if we assume some approximations:

• Proteins have multiple functions including acting as enzymes (catalyzing reactions) and transport proteins (allowing molecule transport). Lipids (fats) are for long - term energy storage. But among the given options, if we consider the most common mis - associations:
• If we assume that the option intended to say that proteins (transport proteins) for transport and lipids (fats) for energy (even though it's a long - term energy), but still, all options have inaccuracies. But if we have to choose the “least wrong” based on common biomolecule function associations:
• Option B: Proteins (as enzymes) catalyze reactions (a correct protein function). Lipids (in the cell membrane, although it's the phospholipid bilayer structure that is part of the membrane, not for transport in the sense of active/passive transport by proteins) has an inaccuracy. But compared to other options:
• Option A: Wrong functions for both.
• Option C: Lipids do not store genetic info (nucleic acids do).
• Option D: Proteins do not store genetic info.

So, if forced to choose, Option B is the “best” among the given (with the caveat that the lipid function description is not entirely accurate in terms of transport as described in the option).