CH 7 – Flashcards

Binary fission differs from the division of eukaryotic cells in that...

Which cellular event occurs outside of interphase?

Which statement about cyclin-dependent kinases (CDKs) or cyclin is false?

In meiosis, as opposed to mitosis...

In meiosis II,

A human cell in G1 of the cell cycle has 23 pairs of chromosomes. The number of daughter chromosomes in a cell in telophase II of meiosis is

Translocations

When does a cell make the commitment for another cell cycle?

The mitotic spindle is composed of

Replication begins near the center of the cell, and as it proceeds, the _______ regions move toward _______ of the cell.

The initiation of the S phase and the M phase of the cell cycle each depend on pairs of molecules called _______ and _______.

The internal signals that control the transitions between stages of the cell cycle were discovered by

The essence of _______ reproduction is the random selection of half of the _______ chromosome set to make a _______ gamete.

Having extra copies of one chromosome in a cell is an example of

Crossing over between non-homologous chromosomes during meiosis I will most likely result in

Organisms of a species of fern have both a multicellular haploid and a multicellular diploid phase. This is an example of

Which of the following is a form of cell death?

With respect to what happens with the nuclear envelope, telophase is most like the opposite of

If n = 30 for a species of beetle, then a diploid cell would have a total of _______ chromosomes.

Cells that do not divide are usually arrested in

Mutations in the hypothetical gene S67 can lead to cancer when they reduce the expression of the gene. Thus, S67 is likely a(n)

Which process is closest to the opposite of meiosis in terms of effects on the number of chromosomes?

Which list shows life cycles ranked from that with the greatest proportion spent in the haploid phase to that with the smallest proportion spent in the haploid phase?

Pairing of homologous chromosomes occurs

Suppose that in mitotic metaphase, there are 16 sister chromatids in a cell. How many centromeres are in the cell?

What is the essential difference between necrosis and apoptosis?

Homologous chromosomes come together and line up along their entire lengths

Down syndrome is an example of _______ in humans.

In _______ life cycles, there is more time spent between meiosis and fertilization than between fertilization and meiosis.

A cell in G2 has 0.8 picograms (pg) of DNA. How much DNA did that cell have in G1?

Which of the following statements about plant cytokinesis is true?

Which of the following is most likely to lead to aneuploidy?

A bacterial cell has a mutation in the ter site. The most likely result would be that

Which of the processes below would likely produce progeny with the greatest genetic variation?

In which of the following stages of meiosis would chiasmata be visible?

Which of the following is not a feature of interphase?

Which type of microtubule forms the spindle?

What leads to recombinant chromatids?

With respect to the effect of the normal function of the gene, which is most closely the opposite of a tumor suppressor?

Chromosome number is reduced during meiosis because the process consists of

DNA replication occurs during

The haploid number of chromosomes in a cell of a grasshopper is 18. How many chromosomes are in a somatic cell?

The haploid chromosome number of a cell is 32. How many chromosomes will a trisomic individual have?

Retinoblastoma is a _______ regulator of the cell cycle in normal cells. Tumors will most likely result from _______ in its activity.

After the centromeres separate during mitosis, the chromatids, now called _______, move toward opposite poles of the spindle.

The number of chromosomes in a cell is reduced by half during

Which structure(s) is/are primarily involved in determining the direction of movement of sister chromatids during mitosis?

Oxygen starvation in a cell will most likely lead to

What action do CDKs perform on target proteins?

An animal cell that is no longer needed by the organism is most likely to undergo

Which of the following statements about independent assortment is false?

What structures are made up of proteins and play important roles in the movement of chromosomes in mitosis?

During which phase of mitosis do chromosomes become less compact?

An environmental change has led to the production of more than the normal amount of cyclin. This would tend to increase the activity of the CDK, leading to _______ phosphorylation of the target protein, which in turn would lead to _______ cells being stopped at the checkpoint.

If greater than normal amounts of the G1-S cyclin-CDK were produced, the most likely result would be _______ of RB and _______ of the cell cycle.

A tissue in a plant contains three types of cells that divide at different rates. You would expect the cell type that divides most rapidly to spend _______ time in the _______ phase than the other cells.