Ribosomes Flashcards
1
Q
What are ribosomes?
A
Small cytoplasmic granules found in all cells.
2
Q
Where in a cell might ribosomes occur?
A
In the cytoplasm or associated with the RER.
3
Q
What are the two types of ribosomes?
A
80s and 70s.
4
Q
Where are 80s ribosomes found?
A
In eukaryotic cells.
5
Q
Where are 70s ribosomes found?
A
In prokaryotic cells, mitochondria and chloroplasts.
6
Q
What size are 80s ribosomes?
A
25 nanometres in diameter.
7
Q
What size are 70s ribosomes?
A
slightly smaller than 80s.
8
Q
What do ribosomes have?
A
One large subunit and one small subunit.
9
Q
What does each subunit contain?
A
Ribosomal RNA and protein.
10
Q
What are ribosomes the site of?
A
Protein synthesis.
11
Q
What do ribosomes account for and why?
A
25% of the dry mass of a cell, as they occur in such vast numbers.
