Exam 14: Cellular Reproduction

In the human female,after their long arrest,when do oocytes resume meiosis?

What is the first step in genetic recombination?

What apparently drives the separation of centrosomes?

At the outer surface of the centromere of each chromatid is a proteinaceous,buttonlike structure called the __________.

What appears to be responsible for the tighter adhesion between chromosomes seen at centromeres rather than along the chromosome arms?

During what stage do studies of mice and yeast cells suggest that DNA breaks leading to recombination begin?

What triggers the entry of a cell into mitosis?

The stages through which a cell passes from one cell division to the next constitute the _________.

What disease can be defined as resulting from a breakdown in a cell's ability to regulate its own division?

DNA replication and the production of additional histones occur during what part of the cell cycle?

What external stimulation is required by mammalian cells to progress through the cell cycle prior to reaching the restriction point?

Which stage of mitosis starts as sister chromatids split apart and begin to move toward opposite poles?

What is required for the separation of homologous chromosomes at anaphase I?

Which cells typically have very short cell cycles on the order of less than 30 minutes?

What may be the purpose of the clustering of telomeres in a variety of eukaryotic cells that presumably causes chromosomes to look like a flower bouquet?

As they separate,homologous chromosomes are seen to remain attached to each other at specific points by X-shaped structures at the crossover sites called _________.

Due to the reciprocal exchange of DNA strands that occurs during genetic recombination,the two duplexes are covalently linked to one another to form a joint molecule called a(n)__________ that contains a pair of DNA crossovers called __________.

What molecular motor has been implicated in the model of nuclear envelope dissolution that involves microtubules?

The Holliday junction recombination intermediate is not a static structure because the linkage point may move in one direction or another,a process known as _________.

As cells enter mitosis,their microtubules disassemble and then reassemble forming the mitotic spindle with a focus at the ________,a special animal cell microtubule-organizing structure.