Question

match the following structures with their names. structure c structure a structure b chromatid centromere chromosome

Explanation:

To solve this, we recall the structure of a chromosome: A chromosome consists of two sister chromatids joined at the centromere.

• A chromatid is one of the two identical halves of a replicated chromosome. So if a structure is a single "arm" of the X - shaped chromosome, it's a chromatid.
• The centromere is the region where the two sister chromatids are attached, it's the constricted part of the chromosome.
• A chromosome (in the replicated state) is the X - shaped structure made of two chromatids joined at the centromere.

Assuming the diagram (the white card with the X - shaped structure) has:

• The individual "arms" (the two parts labeled maybe as (a) and (b)) are chromatids.
• The middle part where they are joined is the centromere.
• The whole X - shaped structure is the chromosome.

Now, matching the structures:

• If Structure A is the whole X - shaped structure, it should match "chromosome".
• If Structure B is the constricted middle part, it should match "centromere".
• If Structure C is one of the "arms", it should match "chromatid".

(Note: Since the exact labels on the structures (A, B, C) and the diagram's labels (like (a) and (b)) are a bit unclear from the image, but based on typical chromosome structure:

• Chromatid: one of the two identical strands (so if Structure C is a single strand - like part, it's chromatid.
• Centromere: the region holding chromatids together (so if Structure A is the middle part, centromere.
• Chromosome: the whole X - shaped structure (so if Structure B is the whole X, chromosome). But likely, the correct matches are:

Structure C - chromatid (since chromatid is a single strand - like part of the chromosome), Structure A - centromere (the middle part), Structure B - chromosome (the whole X - shaped structure with two chromatids).

Answer:

Structure C - chromatid; Structure A - centromere; Structure B - chromosome