lecture 7 Flashcards

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1
Q

what is the function of the nucleolus

A
  • produces ribosomes
  • no membrane seperates nucleolus from the rest of the nucleus
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2
Q

what are the types of cytoskeletons

A

1) microtubles
2) microfilaments
3) intermediate filaments

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3
Q

where are ribosomes situated

A

1) free floating im the cytoplasm
2) attached to rough edoplastic reticulum

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4
Q

what are the possible roles of the cytoskeleton

A
  • movement of cells (flagella and celia)
  • movement of things within the cell
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5
Q

what are the functions of the microtubles (ones we see the most) (cytoskeleton)

A
  1. support the cell
  2. transport
    - in cell
    - celia and flagella
    - transport chromosomes during cell devision
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6
Q

what is the role of the centrosome (cytoskeleton microtubles)

A
  • non membranous
  • in animal cell, made up of a pair of centrioles (made up of microtubles)

fonction:
- microtuble organisation center
- move chromosomes during cell devision (so they line up properly)

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7
Q

what is the role of flagella and celia (cytoskeleton microtubles )

A
  • used for movement
  • flagella= few and long
  • cilia = short and numerous (like little brushes)
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8
Q

what is the role of intermidiate filaments

A

function:
- maintenance of cell shape
- larger then microfilaments, but smaller then microtubles
- DONT bind ATP or serve as tracks
- each type is constructed from different protein subunit

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9
Q

What are the type of microtubles

A

Centrosome and Flagella and cilia

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10
Q

What are microfilaments (cytoskeleton)

A
  • 2 strings of actin
  • maintains cell shape
  • movement of cell (muscle cell contraction)
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11
Q

characterisitcs of extra cellular matrix (microfilament)

A
  • holds cells together
  • help regulate cell behavior
  • cell signaling (communication)
  • cell receptors
  • ## it is made of things that cells secrete themselves
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12
Q

what does the extracellular matrix consist of

A

gel like substance made of carbohydrates and fibrous proteins

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13
Q

what does network of microfilaments do

A

makes a three-dimensional network formed by microfilaments just inside the plasma membrane (cortical microfilaments) helps support the cell’s shape

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14
Q

where can we find celia

A

felopian tubes

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