Prokaryotic cell features

Question 1

What organisms are they found in?

Answer 1

Bacteria

Question 2

Cell size

Answer 2

Avg. diameter 10 micrometers

Question 3

Are prokaryotic or eukaryotic cells larger?

Answer 3

Eukaryotic cells

Question 4

Form

Answer 4

Mainly unicellular

Question 5

Evolutionary origin

Answer 5

3.5 thousand million years ago

Question 6

What process for cell division?

Answer 6

Binary fission, with no spindle

Question 7

Describe the genetic material

Answer 7

-DNA is circular and lies free in the cytoplasm, there is no true nucleus
-DNA is naked, so isn’t associated with proteins or RNA to form chromosomes

Question 8

Protein synthesis

Answer 8

-Smaller 70S ribosomes
-No ER present

Question 9

Organelles

Answer 9

-Few organelles
-None are surrounded by an envelope (two membranes)

Question 10

Cell walls

Answer 10

-Rigid and contain polysaccharides with amino acids
-Murein as the main strengthening compound

Question 11

Flagella

Answer 11

-Simple and lacking microtubules
-Extracellular
-20nm diameter

Question 12

Respiration

Answer 12

-Mesosomes in bacteria
-Except cytoplasmic membranes in blue-green bacteria

Question 13

Photosynthesis

Answer 13

-No chloroplasts
-Takes place on membranes which show no stacking

Question 14

Nitrogen fixation

Answer 14

Some have the ability