Question

1. a train car is to a train, as a ____ is to a ____. *

7 points
○ monosaccharide/polysaccharide
○ polymer/monomer
○ monomer/polymer
○ polysaccharide/ monosaccharide

Explanation:

A train car is a single unit that makes up a train (a larger structure). A monomer is a single unit that makes up a polymer (a larger molecule made of many monomers). Let's analyze each option:

• Option 1: Monosaccharide is a monomer of polysaccharide, but the order here is monomer first then polymer? Wait, no—train car (single) to train (multiple). Monosaccharide is a single sugar, polysaccharide is many. But the first part of the analogy is single to multiple. Wait, no: train car (single) → train (multiple). So we need single unit → larger structure made of many.
• Option 2: Polymer is made of monomers, so polymer is the larger one, monomer the smaller. This is reversed.
• Option 3: Monomer (single unit) → polymer (many monomers). This matches train car (single) → train (many train cars).
• Option 4: Polysaccharide is many sugars, monosaccharide is one. This is reversed (larger to smaller), which doesn't match train car (smaller) to train (larger).

Also, monosaccharide/polysaccharide is a specific example of monomer/polymer. But the general relationship of single unit to larger structure is monomer to polymer. So the correct analogy is monomer (like train car) to polymer (like train).

Answer:

C. monomer/polymer