lecture 7

Question 1

what is the function of the nucleolus

Answer 1

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

Question 2

what are the types of cytoskeletons

Answer 2

1) microtubles
2) microfilaments
3) intermediate filaments

Question 3

where are ribosomes situated

Answer 3

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

Question 4

what are the possible roles of the cytoskeleton

Answer 4

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

Question 5

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

Answer 5

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

Question 6

what is the role of the centrosome (cytoskeleton microtubles)

Answer 6

• 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)

Question 7

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

Answer 7

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

Question 8

what is the role of intermidiate filaments

Answer 8

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

Question 9

What are the type of microtubles

Answer 9

Centrosome and Flagella and cilia

Question 10

What are microfilaments (cytoskeleton)

Answer 10

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

Question 11

characterisitcs of extra cellular matrix (microfilament)

Answer 11

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

Question 12

what does the extracellular matrix consist of

Answer 12

gel like substance made of carbohydrates and fibrous proteins

Question 13

what does network of microfilaments do

Answer 13

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

Question 14

where can we find celia

Answer 14

felopian tubes