Exam 7: The Cell Cycle and Cell Division

An environmental change that leads to the production of decreased levels of cyclin expression would tend to _______ the activity of the CDK.This would lead to _______ phosphorylation of RB,which in turn would lead to _______ cells being stopped at the R point.

Meiosis can occur

The major drawback of asexual reproduction is that it

At the milestone that defines metaphase,the chromosomes

Sexual reproduction increases genetic variability through

Which statement about apoptosis in plants and animals is false?

Late in mitotic anaphase,a cell with 28 daughter chromosomes has _______ centromeres in the dividing cell.

The fact that most monosomies and trisomies are lethal to human embryos illustrates the

Mitotic prophase differs from prophase I of meiosis in that

Which of the following is not involved in the separation of paired chromatids and their movement to opposite poles?

At the milestone that defines anaphase,the chromosomes

A cell carries out its specialized functions during

Which of the following occurs during mitotic prometaphase?

Chronic neurodegenerative diseases like Huntington's disease involve the death of neurons in certain parts of the brain.Progress in treating such diseases will most likely come about when medical science has a better understanding of

The initiation of the S phase of the cell cycle depends on the functional activity of a pair of molecules called _______ and _______.

Chromosomes "decondense" into diffuse chromatin

Fission yeast can reproduce asexually following mitosis by

The microtubules of the mitotic spindle attach to a specialized structure in the centromere region of each chromosome called the

A normal zygote has _______ copies of each chromosome.

Very few chromosome abnormalities (trisomies and monosomies)are observed in the human population because