Test 3 Flashcards
The division of genetic material in eukaryotic cells is called
Mitosis
In which phase does the nuclear envelope reform?
Telophase
A zygote is
diploid
The cell cycle
It has major cell cycle check points, it’s regulated by cyclin and CDK’s, there is different levels of cyclin at different cell stages, and it can be paused by the action of p53.
the protein FtsZ plays what role
Forms a ring at the cite of constriction
A human cell with a total of 23 chromosomes is
Haploid
Crossing over happens in what step of meiosis
prophase 1
cell cyclin check points
Act as a brake in cell division if something isn’t right, provides a check to see if the steps of cell division were followed, can involve the protein P53.
Division of the cells cytoplasm in eukaryotic cells is known as
cytokinesis
The function of histone proteins
to package DNA in eukaryotic chromosomes
Meiotic cell division
cell division results in gametes, cell division results in daughter cells, and cell division requires two rounds of nuclear division.
Assembly of what cytoskeleton protein is initiated by M cyclin and CDK complex
Microtubules
function of a centromere
attatch the sister chromatids to each other.
How would the loss of P53 activity affect a cell?
The G1/S checkpoint would not be functional, DNA damage could accumulate and CDK activity would not be appropriately regulated.
Chromosomes condense in which phase of mitosis
Prophase
Synapsis is best described as
the pairing of homologous chromosomes in prophase1.
The development of cancer requires both the ___ of an oncogene and the __ of a tumor suppressor.
Activation; inhibition
when do sister chromatids separate in meiosis
anaphase II
What type of protein is being activated by the G1/S cyclin-CDK complex to promote the expression of histone proteins?
A transcription factor.
At the start of mitosis how many sister chromotids are present in the human cell
92
