chapter 10

Question 1

All organisms must break down nuclear envelope and form a mitotic spindle in order to replicate t/f

Answer 1

false

Question 2

Match each to bacteria or animal cells:

septation
mitosis
linear dna
circular dna

Answer 2

septation- bacteria
mitosis- animal
linear dna-animal
circular dna- bacteria

Question 3

during s phase____, holds duplicated sister chromatids together , and is replaced by ____ in g2/prophase, which separates sister chromatids except at the ______

Answer 3

Cohesin, condensin, centrometre

Question 4

Match each stage with corresponding chromosome feature
prometaphase 
metaphase
prophase
anaphase
telophase

Answer 4

prometa - attache to kinetchore fibres

meta- chromosomes are aligned

prophase- chromosomes are condensed

anaphase- chromosomes separate

telophase- chromosomes relax

Question 5

in plant cells cytokinesis occurs by?

Answer 5

building a cell plate, first depositing membrane, then cell wall components

Question 6

true or false during the process of binary fission (bacteria) DNA replication and segregation happen at the same time

Answer 6

true

Question 7

which of the following could regulate a cyclin dependant kinase

a) removal of an inhibitory phosphate group

b) addition of an activating phosphate group
c) expression level of a cyclin

d) dimerization and autophosphorylation

Answer 7

a b c

Question 8

Cell status at each checkpoint

spindle

g1s
g2m

Answer 8

spindle - all chromosomes aligned at metaphase plate

g1s cell size is adequate to support division

g2m- dna integrity after replication

Question 9

Proto oncogene mutations

Answer 9

can cause tumour growth

Question 10

binary fission in prokaryotes does not require

replication of dna
elongation of cell
separation of daughter cells
assembly of nuclear envelope

Answer 10

assembly of the nuclear envelope, (no nuclear envelope in bacteria)

Question 11

chromatin is composed of

Answer 11

dna and proetin

Question 12

what is a nucleosome

Answer 12

region of DNA wound around histone proteins

Question 13

what is the role of cohesin proteins in cell division

Answer 13

hold DNA of sister chromatids together

Question 14

the kinetochore is a structure that functions to

Answer 14

connect the centromere to microtubules

Question 15

separation of sister chromatids occurs during

Answer 15

anaphase

Question 16

why is cytokinesis an important part of cell division

Answer 16

responsible for proper separation of the cytoplasm

Question 17

what steps in the cell cycle represent an irreversible commitment

Answer 17

g1/s (cell cycle decision), anaphase

Question 18

cdk’s are regulated by

Answer 18

periodic destruction of cyclins, addition or removal of phosphates

Question 19

bacterial SMC proteins, cohesin, and condensin all have a similar structure, their function is ?

Answer 19

Interact with DNA to compact or hold strands together

Question 20

proto oncogenes act in a dominant fashion because

Answer 20

they act in a gain of function fashion to turn on the cell cycle

Question 21

metaphase to anaphase transition involves

Answer 21

loss of cohesion between sister chromatids

Question 22

the main difference between bac cell and eukaryotic cell division is that

Answer 22

bacterial dna replication and segregation happen at same time but in eukaryotes they are separated in time.

Question 23

in animals cytokinesis is accomplished by a contractile ring containing actin , the related process in bacteria is

Answer 23

SEPTATION via ring of FtsZ protein which is tubulin like

Question 24

order the phases of mitosis

Answer 24

prophase, prometaphase, metaphase, anaphase, telophase

Question 25

when does the mitotic spindle begin to form

Answer 25

prophase

Question 26

kinetichores attach to chromosomes in ______

Answer 26

prometaphase

Question 27

chromosomes align on _____ plate in ______

Answer 27

metaphase plate, metaphase

Question 28

nuclear envelopes form in the last stage of mitosis, which is ______.

Answer 28

telophase

Question 29

Cleavage of the cell

Answer 29

cytokinesis