Lecture 7 Flashcards

1
Q

How does the cytoskeleton get organized to move things

A

Things - means stuff inside the cell (organelles, chromosomes) and the cell itself

-motor proteins
- centrosomes
-cilia and flagella

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2
Q

Motor proteins

A

-walk along cytoskeleton filaments carrying vesicles and other organelles

-Bind the filament on one end, bind cargo on the other

-energy for walking comes from ATP

-no motors for intermediate filaments

-no known motors in prokaryotes

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3
Q

Motor families

A

Myosins: walk along microfilaments

Kinesins: walk along microtubules

Dyneins: walk along microtubules

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4
Q

Tail domain

A

Carries cargo

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5
Q

Motor domain

A

Walks on cytoskeleton

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6
Q

Centrosomes (animal cells)

A

-tether microtubules at their bases

  • this creates cell polarity and contributes to shape
  • found at:
    • mitotic spindle poles to organize microtubules
    • base of cilia and flagella

-consist of 2 centrioles surrounded by a dense matrix of proteins

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7
Q

Centrioles inside a ____?

A

Centrosome

Centrioles are composed of specialized microtubules

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8
Q

Flagella

A

Movements propel through watery medium

Ex. Sperm motility

The tail

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9
Q

Cilia

A

Shorter, move fluids over cell surface

-can propel the cell (like a paramecium)
-line air passages of lungs and sweep out bacteria, dust particles, and other contaminants

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10
Q

Cilia and flagella both have in common

A

Both surrounded by plasma membrane

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11
Q

Cilia and flagella movement by microtubules and motor proteins

A

Dyneins cross link microtubules and cause them to bend when active

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12
Q

Prokaryotic flagellum

A

-totally different machanism in bacteria

-uses rotating socket at the base to turn and create whipping motion

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13
Q

Extracellular Matrix (ECM) and cell walls

Functions

A

Support

Adhesion

Protection

Gateway for in/out and intercellular communication

Secreted from cells

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14
Q

Animals- extracellular matrix

A

-mostly proteins and glycoproteins (proteins with sugars attached)

  • widely variable composition depending on cell type
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15
Q

Plants fungi bacteria- cell walls (technically ECMs but referred to as walls)

A

Plants- mostly cellulose (polysaccharide)

Fungi- mostly chitin (polysaccharide)

Bacteria- mostly peptidoglycans (polysaccharides with peptide (small proteins) attached)

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16
Q

Animal ECM roles

A

-adhesion (hold cells together or to a surface)
-support
-shape/ migration
-cell division

Lots of intermediate filament proteins such as collagen

Forms the mass of skin, bones, tendons

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17
Q

Animal cell junctions

A

-Hold cells together

-allow selective intercellular movement of stuff

  • seal neighbouring cells to prevent passage
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18
Q

Animal cell junction types

A

-anchoring junctions
Hold together

  • tight junctions
    seal cells together

-gap junctions
Allow passage

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19
Q

Plant cell wall functions

A

Support and cell shape

Hold cells together

Protection

Intercellular communication

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20
Q

Plant cell walls composition

A

Cellulose

Other polysaccharides

Proteins

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21
Q

Primary cell wall structure

A

Pectin rich middle lamella joins adjacent cells

Perforations called plasmodesmata allow intercellular transport and communication

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22
Q

Bacterial cell wall and surface structure

A

-mostly peptidoglycans (polysaccharides with short peptides attached)

-cell wall typically coated with polysaccharides called a CAPSULE

  • capsule can also form a gooey “slime layer” to aid in surface adhesion and biofilm formation
23
Q

Eukaryotic cell examples

A

Animals plants fungi

24
Q

Eukaryotic cell size

A

10-100 micrometers in diameter

25
Q

Eukaryotic cell number

A

Multicellular

26
Q

Eukaryotic cell. Nucleus?

27
Q

Eukaryotic cell wall?

A

In plants and fungi only

28
Q

Genetic recombination eukaryotic cell

A

Meiosis and fusion of gametes

29
Q

Eukaryotic microtubules?

30
Q

Eukaryotic ER?

31
Q

Eukaryotic cytoskeleton?

A

Extensive and complex

32
Q

Eukaryotic mitochondria?

33
Q

Eukaryotic ribosomes?

34
Q

Eukaryotic vesicles?

35
Q

Eukaryotic Golgi apparatus ?

36
Q

Eukaryotic chloroplasts

A

Present in plants

37
Q

Eukaryotic vacuoles?

38
Q

Eukaryotic flagella?

39
Q

Prokaryotic example

A

Bacteria archae

40
Q

Prokaryotic cell size

A

0.2-2.0 micrometers

41
Q

Prokaryotic cell number

A

Usually unicellular

42
Q

Prokaryotic nucleus?

43
Q

Prokaryotic cell wall?

A

Present in all and usually complex

44
Q

Genetic recombination Prokaryotic

A

DNA transfer between organisms

45
Q

Prokaryotic microtubules?

46
Q

Prokaryotic ER?

47
Q

Prokaryotic cytoskeleton

48
Q

Prokaryotic mitochondria

A

Absent (but most bacteria carry out cellular respiration)

49
Q

Prokaryotic ribosomes?

50
Q

Vesicles Prokaryotic ?

51
Q

Prokaryotic Golgi apparatus?

52
Q

Prokaryotic chloroplasts

A

Absent but some carry out photosynthesis

53
Q

Prokaryotic vacuoles

54
Q

Prokaryotic flagella