Exam 19: The Cell Cycle, DNA Replication, and Mitosis

A NASA probe returned samples of rocks from the surface of Mars.From these rocks,a prokaryotic organism was isolated and remained viable under conditions similar to that of Mars.The organisms are capable of dividing to replicate themselves.In order to determine whether the DNA replication of these organisms was semiconservative,an experiment using N15/N14 (similar to that of Mendelson and Stahl)was performed.If the method of DNA replication were conservative,after one generation one would expect to see

________ is a new technique that has facilitated cell cycle studies.

The phase of the cell cycle associated with the replication of DNA is

The type of DNA repair that fixes mistakes in nucleotide incorporation is known as ________ repair.

________ synthesis is a damage-tolerant mechanism that allows synthesis of a new DNA strand from a damaged template.

Several human disorders are caused by DNA repair pathway deficiencies. Choose one and describe: 1)what the deficiency is and 2)how the defect could be corrected.

During metaphase of mitosis,how many telomeres are present in a cell in which 2n = 12?

The proteins most actively synthesized during the S phase of the cell cycle are

DNA replication is

The phase of the cell cycle associated with the doubling of the amount of DNA in the cell is

Which of the following proteins is observed exclusively in association with eukaryotic DNA replication?

The region of the centromere contains repeated DNA sequences known as ________.

DNA replication

Proteins bound to CEN sequences form a complex known as the ________.

A mutant strain of yeast possesses a mutation in the nda2 gene,resulting in no production of α1 tubulin.As a result,these cells would most likely

Using polyethylene glycol (PEG),early G1 phase cells were fused with S phase cells.Of the following events,which would you expect to be induced in the G1 cells as a result of the fusion?

The longest phase of the cell cycle is

Which of the following families of proteins is associated with the contractile ring?

A population of T cells has been stimulated to proliferate in response to a particular antigen.A sample of 1000 cells is examined microscopically,revealing that 200 of these cells are in the various stages of mitosis.Of the remaining 800 in interphase,400 have x amount of DNA,250 have 2x,and the remaining 150 have amounts somewhere between x and 2x.Additional analysis reveals that the G2 phase of the cell cycle lasts 2 hours.What is the total length of the cell cycle?

Which of the following statements regarding DNA replication is true?