Eukaryotic cell structure - 2.4 (2) Flashcards
Module 2, Chapter 2, 2.4, Page 27
How can a ultrastructure of a cell be seen?
using an electron microscope
What are chemical reactions the fundamental processes of?
life and in cells they require both enzymes and specific reaction conditions
What are enzymes?
a protein molecule in cells which works as a biological catalyst -> it speeds up chemical reactions in the body
What does metabolism involve?
both the synthesis (building up) and the breaking down of molecules
Where do different sets of reactions take place?
in different regions of the ultrastructure of the cell
Where do the reactions take place?
in the cytoplasm
What is the cell cytoplasm separated from?
the external enviroment by a cell-surface membrane
In eukaryotic cells, what is the cytoplasm divided into?
many different membrane-bound compartments, known as organelles
What do these different organelles provide?
distinct (different) enviroments and therefore conditions for different cellular reactions
What are selectively permeable?
membranes
What do membranes control?
the movement of substances into and out of the cell and organelles
What are membranes effective barriers in controlling?
which substances enter and exit cells
Are membranes fragile?
yes
Are there a number of organelles that are common to all eukaryotic cells?
yes
Do organelles have a distinct structure and function?
yes
