Which one of the following is not a part of the nucleus?
Ribosome
The correct option is A.
Explanation of correct option:
Explanation of incorrect options:
Option B
Thread-like structures (chromosomes) carry DNA and transfer genetic information.
Option C
The nucleolus facilitates ribosome biogenesis.
Option D
Gene is the functional unit of heredity.
Final answer: Ribosome is not a part of the nucleus.