Question

which of the following best describes the nucleus?
a. a network of tubules that processes lipids and proteins.
b. the organelle that stores dna and directs cellular activities.
c. the powerhouse of the cell.
d. a jelly-like substance that fills the cell.

what is the function of the rough endoplasmic reticulum?
a. synthesizing proteins due to the presence of ribosomes.
b. storing dna.
c. controlling cell division.
d. producing energy for the cell.

Explanation:

• For the first question:
• The nucleus contains DNA and controls cellular activities.
• Option a describes the endoplasmic reticulum.
• Option c refers to mitochondria.
• Option d is about cytoplasm.
• For the second question:
• The rough endoplasmic reticulum has ribosomes on its surface and synthesizes proteins.
• Option b is a function of the nucleus.
• Option c is related to the role of certain genes and cell cycle regulators (not the rough ER).
• Option d is a function of mitochondria.

Answer:

1. B. The organelle that stores DNA and directs cellular activities.
2. A. Synthesizing proteins due to the presence of ribosomes.