KEY DEFNTIONS OF EUKAROYTIC CELLS

Question 1

What is the ultrastrucutre

Answer 1

rhe detailed organusation if the cell only visible usinf the electron microscope

Question 2

What is the chromatin

Answer 2

granular combination of DNA bonded to protein found in the nucleus when the cell is not actively dividingq

Question 3

What is nucleuous

Answer 3

extra dense area of almost pure DNA and protein found in the nucleus involved in the production of ribosomes and control of growth and divison

Question 4

What is cristae

Answer 4

are the infoldings of the inner membrane of the mitochondria which provide a large surface area for the reactions of areboic respiration

Question 5

What is the endosymbiotic theory

Answer 5

theory suggests that mitochondria and chloroplasts orginated as independant prokaryotic organisms that began living symbitcally inside other cells as endosymbionts

Question 6

What are centrioles

Answer 6

Bundles of tubles found near the nucleus and ivolved in cell divsion by the production of a spindle of microtubles that move the chrosomes to the ends of the cell

Question 7

What are spindle

Answer 7

a set of overlapping protein microtublres running the length of the c ell formed as the centrioles pull apart in mitosis and meisosis

Question 8

What are mircrofilaments

Answer 8

Protein fibres that make up of the structure of the cyoskelton

Question 9

What are microtubles

Answer 9

Are tiny protein tubes about 20nm in diamater that make up part of the strucutre of the cytoskelton

Question 10

What are vacuoles

Answer 10

Fluid filled cavity within the cytoplasm of a cell surrounded by a membrane

Question 11

What is a contractile vacuoles

Answer 11

Vacuoles that can fill and empty to help control the concentration of the cytoplasm of simple freshwater animals