pre-AP Biology ch. 8
A diploid organism whose somatic (nonsex) cells each contain 32 chromosomes produces gametes containing _____ chromosomes.
16
Baker's yeast is an organism with 32 chromosomes that can perform asexual or sexual reproduction and exist as both a diploid and haploid cell. After meiosis, how many chromosomes will be present in each cell?
16
Normal human gametes carry _____ chromosomes.
23
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?
24
Which of the following statements correctly describes the timing of DNA synthesis?
DNA is synthesized in the S phase of interphase. DNA is synthesized in the S phase of interphase.
Mitosis takes place during M phase of the cells cycle, which is longer than interphase
False
Which of the following statements regarding the function of mitosis is false?
Mitosis allows organisms to generate genetic diversity.
What would be the immediate consequence of destroying a cell's centrosomes?
The mitotic spindle would not form.
A benign and a malignant tumor differ in that _____.
cells of a benign tumor remain within the tumor, whereas cells of a malignant tumor can spread to other body tissues
A cell is treated with a drug that prevents the formation of intracellular (within the cell) vesicles. Which of the following processes would be blocked?
cytokinesis in a plant cell
When forming buds, hydras _____.
divide by mitosis
Nucleoli are present during _____.
interphase
Gametes are produced by _____.
meiosis
Spindle fibers attach to kinetochores during _____.
prometaphase
Chromosomes become visible during _____.
prophase
Cytokinesis often, but not always, accompanies _____.
telophase
During mitosis, the chromosomes move because _____.
they attach to a dynamic, precisely regulated mitotic spindle
During prophase a homologous pair of chromosomes consists of _____.
two chromosomes and four chromatids
Which of the following checkpoints does not occur late in G1?
A check that chromosome replication has been successfully completed
Centromeres divide and sister chromosomes become full-fledged chromosomes during _____.
anaphase
