Genome Replication and Expression Flashcards
1
Q
3 types of microtubule in the mitotic spindle
A
- Aster microtubules
- Kinetochore microtubules
- Interpolar microtubules
2
Q
What happens in prophase?
A
- Chromosomes condense
- Centrosomes move apart
3
Q
What happens in prometaphase?
A
- Nuclear membrane breaks down
- Spindle microtubules attach to kinetochores and move actively
4
Q
What happens in metaphase?
A
- Chromosomes align at equator
- Kinetochores from paired sister chromatids attach to opposite poles of spindle
5
Q
What happens in anaphase?
A
- Sister chromatids synchronously separate
- Kinetochore microtubules shorten
- Spindle poles move apart
6
Q
What happens in telophase?
A
- Chromosomes arrive at poles
- Nuclear envelope reassembles giving 2 new nuclei
- Nucleoli reappear - RNA synthesis begins
- Initiation of plasma membrane cleavage
7
Q
What happens in cytokinesis?
A
Contractile ring is formed and mediates division of cell in two
8
Q
What complexes are needed for splicing?
A
RNA-protein complexes (snRNP)
9
Q
What does alternative splicing of some genes allow?
A
Production of different mRNA strands from the same gene
