Biology Practice Questions

24

A certain species of animal has six pairs of chromosomes. How many DNA molecules are present in the nuclei of these animals during G2 phase?

Mitosis

Consider the process by which bacterial populations grow. What process performs a similar function in humans?

telophase

Cytokinesis often, but not always, accompanies

Interphase

During _____, the cell carries out its normal functions and the chromosomes are thinly spread out throughout the nucleus

Interphase

During _______ the cell grows and replicates both its organelles and its chromosomes

It ensures the separation of the replicated chromosomes as a new membrane is made.

During binary fission, the replicated bacterial chromosome attaches to the plasma membrane by specialized anchor proteins. What is the purpose of this attachment between chromosome and membrane

Are housed in a membrane-enclosed nucleus

Eukaryotic chromosomes differ from prokaryotic chromosomes in that they?

tissue repair/ replacement of damaged cells; growth and development

In sexually reproducing multicellular organisms, the main function of mitosis are

telophase

Looking through a light microscope at a dividing cell, you can see two separate groups of chromosomes on opposite ends of the cell. New nuclear envelopes are taking shape around each group. The chromosomes then begin to disappear as they unwind. You are witnessing ______

23

Normal human gametes carry __ number of chromosomes

Joined togehter at a centromere

Sister chromatids are

prometaphase

Spindle fibers attach to kinetochores during

Telophase

The chromosomes arrive at the poles and nuclear envelopes form during which phase of mitosis? Telophase

DNA replication

The first of bacterial replication is ____ ______

16

A diploid whose somatic (nonsex) cells contain 32 chromosomes produce gametes containing __ chromosomes

can produce great variation among the offspring

Asexual and sexual reproduction differ in that sexual reproduction :

cytokinesis

At the end of the mitotic (M) phase, the cytoplasm divides in a process called

binary fission

Bacteria divide by:

anaphase

Centromeres divide and sister chromosomes become full-fledged chromosomes during

Prophase

Chromosomes become visible during

Anaphase

The sister chromatids separate and begin moving toward opposite poles of the cell during which phase of mitosis?

False

True or False. Mitosis takes place during M phase of the cell cycle, which is longer than interphase

Finishes mitosis by dividing the cytoplasm and organelles of the original parent cell into separate daughter cells

What does cytokinesis do?

Proteins

What helps maintain the structure of chromosomes and control the activity of genes?

The nuclear envelope breaks down and chromosomes condense and are attached to spindle fibers

Which events occur during prophase?

A check that chromosome replication has been successfully completed

Which of the following checkpoints does not occur late in G1?

DNA is synthesized in the S phase of interphase.

Which of the following statements correctly describes the timing of DNA synthesis

The sequences are identical

Within one chromosome, what is the relationship between the sequence of bases in DNA of one sister chromatid compared to the other?