Question

what would be the effects if a cell did not have microtubules? check all that apply.
check all that apply
chromosomes could not replicate.
sister chromatids could not attach.
spindle assemblies would not form.
centrioles would not migrate to opposite poles of the cell.
chromosomes would not move during mitosis.

Explanation:

• Microtubules are crucial for spindle assembly (spindle fibers are made of microtubules). Without microtubules, spindle assemblies would not form.
• Centrioles move along microtubules to opposite poles of the cell during cell division. So, centrioles would not migrate to opposite poles of the cell without microtubules.
• Chromosomes move during mitosis (e.g., alignment at the metaphase plate and separation) with the help of microtubules (spindle - microtubule attachment). So, chromosomes would not move during mitosis without microtubules.
• Chromosome replication is a DNA - related process (involving enzymes like DNA polymerase) and not directly dependent on microtubules.
• Sister chromatids attach via the centromere (a DNA - protein complex) and not via microtubules (microtubules attach to kinetochores which are protein structures on chromatids, but the initial attachment of sister chromatids is not microtubule - dependent).

Answer:

• Spindle assemblies would not form.
• Centrioles would not migrate to opposite poles of the cell.
• Chromosomes would not move during mitosis.