BIOL 2020 Lecture Notes - Lecture 22: Intermediate Filament, Phosphorylation, Mitosis

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8 Apr 2019

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Mitosis is initiated by a protein complex called mpf. The nuclear lamina is composed of lamin intermediate filaments, and is disassembled following phosphorylation. The kinetochore is a protein complex located at the centrosome region of the sister chromatids. **not sure whether picture/fill in the blank answers are correct! S (synthesis) phase: dna duplicates, centrosome duplicates. The dna duplicates each chromosome consists of 2 identical sister chromatids that are held together in the centromere region by cohesin. The other thing that happens in s phase: the centrosome duplicates. Centrosome cycle: normally, in g1, there is only 1 centrosome/cell, during s phase, new baby centrioles will emerge at right angles from each parent centriole. Baby centrioles come out of the sides of the mother ones. The two centrioles will stay next to each other until prophase begins. At that time, the 2 centrosomes will move to the 2 poles of the cell: prophase:

Related Questions

Which of the following best describes what happens next to the energy from a photon of light after it excites an electron in the pigment molecule of a plant?

a. The excited electron carries the energy to the primary electron acceptor in the reaction center complex

b. the energy is released as heat and the electron drops back down to its ground state

c. the energy is passed to the other electrons in the light-harvesting complex until it reaches the reaction center complex and reduces the primary electron acceptor

d. the energy is released as light and the electron drops back down to its ground state

e. the excited electron carries the energy to the reaction center complex and oxidizes the primary electron acceptor

2. chromosomes are replicated in the _______ of a cell and sister chromatids are separated in the ____

a. nucleus; cytosol

b. nuclear envelope; nucleus

c. nuclear lamina, nucleus

d. cytosol; cytosol

e. centriole; nucleus

3.which of the following accurately describes a difference between sister chromatids and a chromosome?

a. a pair of sister chromatids contain 2 double-stranded molecules of DNA and a chromosome has 4 double-stranded molecules of DNA

b. each sister chromatid has a single strand of DNA and chromosomes have 2

c. sister chromatids have centromeres and a chromosome does not

d. a pair of sister chromatids contain identical genes, and a chromosome does not

e. sister chromatids are produced during M phase and chromosomes are always present in the cell cycle

4. all of the following take place during mitosis except..

a. DNA is proofread for replication errors

b. chromosomes are replicated

c. the mitotic spindle is formed

d. the nuclear envelope breaks down

e. sister chromatids are separated

f. A and B only

g. B and C only

h. C and D only

i. D and E only

Question 1

The process by which RNA is synthesized using DNA as a template is â¦

Select one:

a. replication

b. transcription

c. translation

d. inspiration

Question 2

Which of the following occurs during meiosis but not mitosis?

Select one:

a. DNA condenses into chromosomes

b. nuclear envelop disappears

c. homologous chromosomes separate

d. sister chromatids separate

Question 3

Which part of the animal life cycle is haploid?

Select one:

a. gamete

b. zygote

c. sporophyte

d. spore

Question 4

Single celled eukaryotic organisms are â¦

Select one:

a. viruses

b. bacterial

c. archaea

d. protists

Question 5

Which type of cellular division results in the formation of diploid cells from a diploid parent cell?

Select one:

a. mitosis

b. meiosis

c. interphase

d. A and B but not C

e. all of the above

Question 6

A sequence of DNA that codes for a single protein is a â¦

Select one:

a. gene

b. ribosome

c. mRNA

d. none of the above

Question 7

Which of the following is characteristic of animals?

Select one:

a. heterotrophic

b. sexual reproduction

c. embryonic development

d. all of the above

Question 8

All genes have only two possible alleles.

Select one:

True

False

Question 9

The presence of membrane-bound organelles is characteristic of â¦

Select one:

a. prokaryotes

b. viruses

c. bacteria

d. eukaryotes

Question 10

What are the building blocks of proteins?

Select one:

a. fatty acids

b. amino acids

c. nucleic acids

d. all of the above

Question 11

During which phase of the cell cycle does DNA replication occur?

Select one:

a. Mitosis

b. Interphase

c. Meiosis

d. Replicosis

Question 12

Which of the following characteristic is shared among fungi and animals?

Select one:

a. autotrophic

b. heterotrophic

c. cell walls

d. absorb nutrients

Question 13

A error in DNA replication that goes unrepaired is a â¦

Select one:

a. chromosome

b. chromatid

c. mutation

d. none of the above

Question 14

Alternate forms of a gene are called ________.

Select one:

a. chromatids

b. chromosomes

c. ribosomal subunits

d. alleles

Question 15

The physical expression of a genotype is the phenotype.

Select one:

True

False

Question 16

In complete dominance, a heterozygous genotype results in â¦

Select one:

a. a recessive phenotype

b. a dominant phenotype

c. a third and unique phenotype

d. none of the above

Question 17

Which theory explains the evolution of eukaryotes from prokaryotes?

Select one:

a. phagocytosis

b. endosymbiosis

c. pinocytosis

d. none of the above

Question 18

Which scientist experimented with plants to describe patterns of inheritance?

Select one:

a. Mendel

b. Chase

c. Einstein

d. Watson

Question 19

Which cellular organelle contains aerobic cellular respiration?

Select one:

a. chloroplasts

b. mitochondria

c. nucleus

d. lysosome

Question 20

Which of the following statements is false?

Select one:

a. Haploid gametes are formed by meiosis

b. Mitosis forms genetically identical daughter cells

c. Mitosis results in the formation of four daughter cells from a single parent cell

d. Mitosis forms diploid daughter cells from a diploid parent cell

Question 21

The first forms of life on Earth were ________.

Select one:

a. plants

b. microorganisms

c. birds

d. dinosaurs

Question 22

Which of the following is used to separate chromosomes during nuclear division?

Select one:

a. cytoskeleton

b. microtubules

c. actin and myosin

d. amoeboid movement

e. all of the above

Question 23

Which generation is most dominant in more primitive plants?

Select one:

a. bryophyte

b. sporophyte

c. gametophyte

d. androphyte

Question 24

Which of the following is characteristic of plants?

Select one:

a. autotrophic

b. contain chloroplasts

c. multicellular

d. all of the above

Question 25

During which phase of mitosis do chromosome line up along the middle of the cell?

Select one:

a. prophase

b. metaphase

c. anaphase

d. telophase

Question 26

During which phase of mitosis does DNA condense into distinct chromosomes?

Select one:

a. prophase

b. metaphase

c. anaphase

d. telophase

Question 27

The process by which DNA is used as a template to make new DNA is â¦

Select one:

a. translation

b. replication

c. transcription

d. allocation

Question 28

Which of the following is characteristic of plant but not animal cells?

Select one:

a. chloroplasts

b. water vacuole

c. cell wall

d. all of the above

Question 29

Which meiotic division is most like mitosis?

Select one:

a. Meiosis I

b. Meiosis II

c. Meiosis III

d. Meiosis IV

Question 30

Which enzyme catalyzes replication?

Select one:

a. DNA polymerase

b. RNA polymerase

c. Ribosome

d. all of the above

BIOL 2020 Lecture Notes - Lecture 22: Intermediate Filament, Phosphorylation, Mitosis

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