BIO 1020 - Mastering Biology Chapter 12 Pre test

Eukaryotic chromosomes are composed of which of the following macromolecules?

DNA and Proteins

Nucleoli are present during _____.

Interphase

Spindle fibers attach to kinetochores during _____.

Prometaphase

Chromosomes become visible during _____.

Prophase

Cytokinesis often, but not always, accompanies _____.

Telophase

Which of the following is true of kinetochores?

They are sites at which microtubules attach to chromosomes.

Why is it difficult to observe individual chromosomes with a light microscope during interphase?

They have uncoiled to form long, thin strands.

During prophase a homologous pair of chromosomes consists of _____.

two chromosomes and four chromatids

In some organisms, such as certain fungi and algae, cells undergo the cell cycle repeatedly without subsequently undergoing cytokinesis. What would result from this?

large cells containing many nuclei

Which of the following events occurs during interphase of the cell cycle?

replication of the DNA

A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain?

92

Centromeres divide and sister chromatids become full-fledged chromosomes during _____.

Anaphase

A cleavage furrow is _____.

a groove in the plasma membrane between daughter nuclei

Cytochalasin B is a chemical that disrupts microfilament formation. How would this interfere with cell division?

cleavage