Question

he uses the general term \chromosomes\ that line up along the middle of the cell (equator). what is a more precise term?
sister chromatids is a more precise term because it is only used when the two exact copies of dna are connected together.
using \chromosomes\ is precise because they dna is condensed
chromatin is a more precise term because the dna is not in condensed form.

Explanation:

Sister chromatids are two identical copies of a single chromosome that are connected by a centromere. They are formed during DNA replication in the S - phase of the cell cycle. When chromosomes line up along the equator of the cell (during metaphase of mitosis or meiosis), they are actually sister chromatids. Chromatin is the less - condensed form of DNA (and associated proteins) that is present in the interphase nucleus. While chromosomes are the condensed form of chromatin, the term "chromosomes" is a more general term. The key point is that when we are talking about the two exact copies of DNA connected together (as in the case of what lines up at the cell equator during certain stages of cell division), the precise term is sister chromatids.

Answer:

Sister chromatids is a more precise term because it is ONLY used when the two exact copies of DNA are connected together.