BIOB11H3 : Chapter 14 Notes -Lecture 17 and 18 (2012)

91 views17 pages

jademole404

13 Apr 2012

School

Department

Course

Professor

For unlimited access to Study Guides, a Grade+ subscription is required.

Document Summary

Lecture 17 cell cycle ii chromosome condensation and movement. Cytoskeleton disassembles, spindle apparatus forms; nuclear membrane breaks down. Prometaphase chromosomes are captured by mts at centromere/kinetochores; and begin movement to equator. Start: is when g1 cyclin/cdk triggers transition from g1 to s phase. Experiment showed that there is a factor in the cytoplasm that triggers cell division. This was called : maturation promoting factor (mpf) was this factor in the cytoplasm. And it was shown that the active form of mpf in m-phase has: Nuclear membrane reforms: a subunit that has cyclin-dependent kinase, cyclin subunit needed for the kinase activity. Maturation promoting factor (mpf): mitotic cyclin is a type of mpf. mitotic cyclin/ckd triggers transition from g2 to m phase. We know that during s phase: dna replication initiates, centrioles are replicated. For m phase to occur: nuclear membrane breaks down (lamins must be broken down)

Related Questions

Select all of the following phases where "duplicated" chromosomes would be present:

_____________________

Suppose that rats have a diploid chromosome number of 42 (2n=42] ). How many chromatids will be present in a cell that is in the middle of mitosis metaphase?

_____________________

Hint:

168

Part A:

In prokaryotes and eukaryotes cell reproduction is similar in that it requires some kind of signal to proceed, DNA replication, careful separation of the DNA into two equal portions, and division of the cytoplasm. How is cell reproduction different in prokaryotes and eukaryotes?

Select one:

a. In a eukaryotic organism, the signals for cell division are usually not related to the environment but to the function of the entire organism.

b. Eukaryotic cells constantly divide whenever environmental conditions are adequate and the cells are large enough.

c. The linear chromosomes in prokaryotes are constantly being updated.

d. Prokaryotic cell division requires cytokinesis before mitosis because of their small size.

e. The sexual phase of most prokaryotes (bacteria) is essential to the rapid cell division required for infection.

Part B:

What does the name Cyclin Dependent Kinase stand for?

Select one:

a. A protein important to the cell cycle that is dependent on DNA synthesis.

b. An enzyme that cuts DNA so that chromosomes can segregate.

c. An enzyme that phosphorylates other proteins using ATP only when the protein Cyclin is bound to the enzyme.

d. An enzyme that rolls along microtubules dragging a vesicle.

e. An enzyme that connects chromosomes to the spindle fiber.

Part C:

The Cell Cycle is divided into Mitosis, Cytokinesis, and Interphase. Mitosis can be ordered into the following phases:

Select one:

a. Prophase/Prometaphase/Metaphase/Anaphase/Telophase

b. Anaphase/Prometaphase/Metaphase/Prophase/Telophase

c. Metaphase/Anaphase/Telophase/Prophase/Prometaphase

d. Telophase/Prophase/Prometaphase/Metaphase/Anaphase

e. Anaphase/Telophase/Prophase/Prometaphase/Metaphase

Part D:

The Cell Cycle is divided into Mitosis, Cytokinesis, and Interphase. Interphase can be ordered into the following phases:

Select one:

a. S/G1/G2

b. G2/G1/S

c. G1/S/G2

d. G2/S/G1

e. G1/G2/S

amethystyak657

Determine whether the following applies to mitosis, meiosis, orboth; also identify the specific stage of cell division thatapplies (e.g. mitosis prophase, meiosis anaphase II, etc)

1) chromosomes pairs line up across the center of the cell

2) sister chromatids seperate

3) spindle fibers separate homologous chromosomes

4) 4 haploid daughter cells are produced

5) a cell 1st undergoes DNA replication

6) chromosomes line up single file across the middle of thecell

7) sister chromatids separate from each other

8) 2 haploid daughter cells form

9) the nuclear membrane re forms

10) spindle fibers attach to pairs of homologous chromosomes

11) the nuclear membrane begins to dissolve

12) centrosomes duplicate

13) synapsis and crossing over occurs

14) 2 diploid daughter cells form

turquoiseporpoise808

BIOB11H3 : Chapter 14 Notes -Lecture 17 and 18 (2012)

Document Summary

Get access

Related Documents

BIOB11H3 Lecture Notes - Lecture 16: Sister Chromatids, Coiled Coil, Condensin

BIOB11H3 Lecture Notes - Lecture 17: Sister Chromatids, Coiled Coil, Condensin

BIOB11H3 Lecture Notes - Lecture 17: Cyclin, Sister Chromatids, Spindle Apparatus

Related Questions