Question

multiple choice question
capsules are typically composed of ______.

sugars
proteins
lipids
nucleic acids

Explanation:

In microbiology (a subfield of Biology, which is part of Natural Science), bacterial capsules are typically composed of polysaccharides (a type of sugar) or sometimes polypeptides (a type of protein), but more commonly, the main component related to the options here is sugars (polysaccharides). However, wait, actually, some capsules can be made of proteins, but the most common and typical composition for many bacterial capsules is polysaccharides (sugars). Wait, no, let's correct: Bacterial capsules are usually composed of polysaccharides (sugars) or sometimes polypeptides (proteins), but among the given options, "sugars" (polysaccharides) is a common component. Wait, but maybe I made a mistake. Let's recall: The capsule is a polysaccharide layer that lies outside the cell envelope of bacteria, and it is typically composed of sugars (polysaccharides). So the correct option is sugars? Wait, no, wait, some sources say that capsules can be made of polysaccharides (sugars) or polypeptides (proteins), but the options here are sugars, proteins, lipids, nucleic acids. So the typical composition is sugars (polysaccharides) or proteins (polypeptides), but more commonly, polysaccharides (sugars) for many bacteria. Wait, but maybe the answer is proteins? No, no, let's check: Bacterial capsules are usually composed of polysaccharides (sugars) or sometimes polypeptides (proteins). So among the options, "sugars" is a typical component. Wait, but maybe the question is about capsules in general, not just bacterial. Wait, the question is "Capsules are typically composed of...". In the context of biology (microbiology), bacterial capsules are typically polysaccharides (sugars) or sometimes proteins. But the options are sugars, proteins, lipids, nucleic acids. So the correct answer is sugars? Wait, no, maybe I'm wrong. Let me check again. Bacterial capsules: The capsule is a well - organized layer made of polysaccharides (sugars) in most cases, but some bacteria have protein - based capsules. However, the most typical and common composition is polysaccharides (sugars). So the correct option is "sugars". Wait, but another thought: Some sources say that the capsule can be composed of polysaccharides (sugars) or polypeptides (proteins). So between the options, "sugars" is a typical component. So the answer is sugars.

Answer:

A. sugars