cell structure and microscopy

Question 1

what does a high concentration of amino acids mean for plasmid/ DNA replication?

Answer 1

-more protein synthesis
-more enzymes for DNA replication

Question 2

how are chloroplast different?

Answer 2

-no histines
70 S ribosomes
circular DNA

Question 3

what is the structure of a prokaryote

Answer 3

-capsule
no nucleus
70S ribosomes
cell wall- Murein

Question 4

organelles important for proteins?

Answer 4

nucleus contains DNA- which codes for polypeptide
ribosome- polypeptide is formed
Golgi apparatus- packages and processes protein
Golgi vesicles transport protein

Question 5

why can you not see the nucleus in an animal cell

Answer 5

not stained

Question 6

what is the cell membrane made up of for all species

Answer 6

phospholipids

Question 7

Contrast how an optical microscope and a transmission electron
microscope work and contrast the limitations of their use when studying
cells.

Answer 7

1.TEM use electrons and optical use light;
2. TEM allows a greater resolution;
3. (So with TEM) smaller organelles / named cell structure can be
observed
OR
greater detail in organelles / named cell structure can be
observed;
4. TEM view only dead / dehydrated specimens and optical (can)
view live specimens;
5. TEM does not show colour and optical (can);
6. TEM requires thinner specimens;
7. TEM requires a more complex/time consuming preparation;
8. TEM focuses using magnets and optical uses (glass) lenses;

Question 8

why does a red blood cell have no organelles

Answer 8

cytoplasm filled with haemoglobin

Question 9

Suggest an explanation for the appearance of the cell-surface membrane
as two dark lines.

Answer 9

Membrane has phospholipid bilayer;
2. Stain binds to phosphate / glycerol;
3. On inside and outside of membrane.