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?
