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Biology 230 > Final Exam > Flashcards

Final Exam Flashcards

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1
Q

What is interphase?

A

The period between one m phase to the next. It includes g1, s, and g2 phase

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2
Q

Which cyclin trigger g2 to m phase ? What is the name of it’s active form

A

M cyclin and M-cdk

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3
Q

What is the order of the cell cycle

A

G1 phase, S phase, G2 phase, and More have ( mitosis and cytokinesis)

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4
Q

Which cyclin binds to its cdk in the late G1 phase

A

S cyclin and G1/S cyclin binds to cdk to form S-cdk and G1/S-cdk

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5
Q

Which cyclin and cdk drive g1 phase to s phase

A

G1 binds to cdk to form g1-cdk

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6
Q

What is the function of cyclin-cdk complexes

A

Phosphorylate a set of target proteins in the cell

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7
Q

What is the function of anaphase-promoting complex (APC)

A

Degradation of m and s cyclin by tagging the cyclin with a chain of ubiquitin

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8
Q

What regulates the activity of cyclin cdk complexes

A

Specific protein kinases and phosphatases. The complexes can be activated by being dephosphorylated

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9
Q

What is the function of Cdk inhibitor protein? Why is this an advantage and give an example

A

The function is to block the assembly or activity of cyclin-cdk complexes. This allows for more time for the cell to grow or wait for more favorable conditions. P27(the hugging machine) is an example

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10
Q

True or false

Once the cell transitions to g1 phase to s phase, it will go all the way through the cell cycle

A

True

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11
Q

What are mitogens

A

Extracellular signals produced by other cells that stimulate the cell to divide

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12
Q

What happens if the cell is deprived of mitogens

A

The cell cycle arrest at g1 and after some time go into g0

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13
Q

How does a cell es ape the cell. Y or arrest

A

By accumulating cyclin by having the mitogens signal the cell to synthesize g 1 cyclin, g1/s cyclins and other proteins involved with DNA synthesis and chromosome duplication. This buildup will progress the cell into the s phase

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14
Q

What is the function of retinoblastoma (Rb) protein

A

A transcription regulator that prevents the cell from activating genes that causes the cell to divide

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15
Q

Describe the relation ship between mitogens and Rb

A

Mitogens causes the cell to active g1-cdk and g1/s-cdk in order to deactivate Rb by phosphorylating it to its inactive form

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16
Q

What happens if dna is damaged in the g1 phase

A

A protein called p53 is activated to its stable form and promoted the transcription of a gene that enforced for a cdk inhibitor protein called p21. P21 binds to the g1/s cdk and s-cdk to prevent them from dvijg the cell into s phase. This gives the cell some time to repair the dna or if it is too severe causes apoptosis

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17
Q

What happens is p53 is missing

A

There is a high rate of mutation and cells tend to become cancerous

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18
Q

What is the purpose of cdc6

A

In g1 phase, it’s concentration increases and will open up the double helix if dna and ready the origin of replication with ORC protein complex

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19
Q

What signals to commence replication if dna and how

A

S-cdk will activate the dna helicases and promote the assembly of the other proteins at the replication fork. It “pulls the trigger for dna replication”

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20
Q

How does s-cdk prevent re-replication

A

It phosphorylate cdc6 so it can be degraded

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21
Q

Where is the cdc6 position and when does it leave

A

It is on top of the ORC and leaves once helicase binds

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22
Q

What is the m phase

A

Mitosis

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23
Q

How does the m cdk remain inactive if the dna is damage before going into m phase

A

M cdk is inactive when phosphorylated. In order to activate it, it is dephosphorylated by cdc25. In order to pause the cell from entering the m phase with damaged dna, cdc 25 must be inactive

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24
Q

Describe the positive feed back m cdk experiences at the end of g2 phase

A

Activating m-cdk completes phosphorylate and activate more cdc 25 that activates more m-cdk

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25
Q

What is the difference between condensins and cohesin

A

Condensin assemble on the individual sister chromatid to coil up more and cohesins keep the Sister chromatids together

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26
Q

What is the order of mitosis

A

Prophase prometaphase metaphase anaphase and helping have

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27
Q

What must happen in order for m phase to begin

A

Dna must be fully replicated and centrisomes must be duplicated

28
Q

What are asters

A

Microtubules that forms when the centrosomes separate in mitosis

29
Q

What happens in pro phase?

A

The sister chromatids condense And the mitotic spindles assembles between the two centrosomes and begin moving apart

30
Q

What happens at the prometaphase

A

What he nuclear envelope is broken down and chromosomes are attach to the sound microtubules bus their kinetochores

31
Q

What happens in metaphase

A

The chromosomes are aligned in the huddle

32
Q

What happens in anaphase

A

The sister chromatids are pulled apart and the kinetochore are getting shorter

33
Q

What happens in telophase

A

The two sets of chromosomes are at the opposite ends of the cells and the nuclear envelope is reassembly

34
Q

What happens in cytokinesis

A

In an animal cell, the cytoplasm is divided into two by the actin and myosin filaments

35
Q

What are kinetochores

A

Protein complexes that are in the centimeters of each of the condensed chromosome

36
Q

What is bi-orientation

A

The microtubules attachment to chromosomes on opposite poles

37
Q

Where is the aster microtubules, kinetochore microtubules, and interpolate microtubules

A

Aster microtubules are not attached to anything and is generally away from the sister chromatids. Kinetochore microtubules are attached to the kinetochore of the chromosomes. Interpolate microtubules are attached to microtubules at the opposite poles

38
Q

How does the cell cleave the cohesins that bind the chromosomes together

A

Active APC degrades securin. Securin is a protein the inhibits separate. Once separate is activated, it cleaves the cohesins

39
Q

Explain the process of cell necrosis

A

A cell dies from an acutely injury that causes it sell and burst. Spilling their contents all over their neighbors

40
Q

What are Caspases

A

A family of protease that is responsible for apoptosis

41
Q

What is the name of the inactive form of caspase

A

Procaspase

42
Q

What are the two types of caspases and what is the function

A

Initiator caspase cleave executioner caspase to activate it. Executioner caspase can active more executioner caspase to kill the cell

43
Q

What regulates the activity of caspases

A

Bcl2 family

44
Q

Which are the two most are the most important bcl2 family to induce cell death

A

Bax and bac

45
Q

What is the purpose of bax and bac

A

Cytochrome c is release form the mitochondria to form a large seven armed protein complex call apoptosome that recruits and activated procaspases( induces cell death). Thus leads to caspase cascade to apoptosis

46
Q

How does survival factor promote cell survival

A

Largely by suppressing apoptosis

47
Q

Give an example of death receptor

A

Fas is activated by its ligand and it’s on the surface of killer lymphocytes. These Killers induce apoptosis to other useless immune cell

48
Q

What is APC (adenonmatous polyposis coli

A

A tumor suppressor gene

49
Q

List the junctions of a epithelial cells

A

Tight junction
Adherents junction with actin circle surrounding it
Desmosome with IF strifes popping out of it
Gap Junction
Hemidesmosomes at the bottom

50
Q

What happens in Paracrine signaling

A

Signal is diffused locally. Many of the signals regulate inflammation or control cell proliferation in a healing sound function

51
Q

What Is contact dependent signaling

A

When cells make direct physical contact through signaling molecules

52
Q

What are the two classes of extracellular signal molecules

A

Large hydrophilic signaling molecules that bind to the receptor. Small hydrophobic molecules that get into the cytosol to activate intracellular enzymes or bind to intracellular receptor proteins

53
Q

Describe the pathway of steroid hormones

A

They pass through the plasma membrane and bind to receptor proteins In the cytosol or nucleus.

54
Q

What is nuclear receptors

A

Cytosolic and nuclear receptors that act as transcription regulators in the nucleus

55
Q

What happens to NO when it enters a cell

A

Converted to nitrates and nitriles

56
Q

What does NO do

A

Causes smooth muscles in the adjacent vessel wall to relax

57
Q

What is the function of intracellular signaling pathways

A

Relay messages
Amply signal received
Integrate signals
Distribute signal

58
Q

Positive feed back can Generate all or none responses while negative feedback can generate responses of switching on and off

A

Yes

59
Q

What are the two switches of cell signaling

A

Kinase that adds phosphates and phosphatase that takes away the phosphate

60
Q

What are the two main types of protein kinase and what is their function

A

Serine/threonine that phosphorylate proteins on serines or threonines
Tyrosine kinase that phosphorylate proteins in tyrosine

61
Q

What are gtp binding proteins

A

Intracellular signaling pathways that toggle between active and u active state baSed in being GTP GDP bound

62
Q

What are the three main classes of cell surface receptor and they functions

A

Ion channel couples receptor that change the permeability of the membrane by altering the membrane potential
G protein coupled receptors that active trimeric GTP binding proteins (g proteins). G proteins function is to activate or Inhibit an enzyme or ion channel in the membrane causing a cascade
Enzyme coupled receptors that can act as enzyme or associate with enzymes inside the cell to activate a wide variety of signaling pathway

63
Q

What are G proteins coupled receptors (GPCR)

A

A single polypeptide that threads back and forth across the lipid bilayer seven times

64
Q

What happens when GPCR is bound to a extracellular signal

A

It’s undergoes a conformation change that activates G protein

65
Q

What happens when GDP is bound to the alpha subunit if a G protein

A

It is inactive

66
Q

What happens when a extracellular signal binds to a G protein

A

The alpha subunit exchanges GDP to GTP. The alpha can detached from beta gamma that is also active and both subunit complex can interact with its target proteins

Biology 230 (3 decks)

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