Prokaryotic Ribosomes

Question 1

True or false

Prokaryotic ribosomes are 80 S type

Answer 1

FALSE ( They are 70S)

Question 2

Ribosomes have size ________( length) x ________ ( breadth) and hence they are the ________( smallest / largest ) cell organelles

Answer 2

15 nm ; 20 nm ; smallest

Question 3

Subunits of 70 S ribosomes are

Answer 3

50 S & 30 S

Question 4

True or false

Subunits of prokaryotic ribosomes are always attached together

Answer 4

False

Question 5

When do the subunits of prokaryotic ribosomes come together ?

Answer 5

When they receive instruction from nucleus to make proteins

Question 6

Larger & smaller subunits are determined on the basis of _________

Answer 6

Density ; Size

Question 7

“S” in 70 S stands for ____ & refers to ________

Answer 7

Svedburg coefficient ; rate of sedimentation

Question 8

How is instruction sent to make proteins ?

Answer 8

DNA makes copy known as mRNA ( messanger RNA)

Question 9

When a chain of Ribosomes attach to a single mRNA , ____ is formed

Answer 9

Polyribosome / Polysome

Question 10

Polysome function

Answer 10

Translate mRNA into proteins

Question 11

True or false

After proteins are synthesised , the 50 S & 30 S units separate

Answer 11

True