Question

what is the primary function of vesicles within a cell?
a. storing genetic information.
b. synthesizing proteins and lipids.
c. transporting materials between organelles.
d. providing structural support.

what distinguishes the rough endoplasmic reticulum (er) from the smooth er?
a. the rough er stores dna, while the smooth er does not.
b. the rough er synthesizes lipids, while the smooth er synthesizes proteins.
c. the rough er has ribosomes attached, while the smooth er does not.
d. the smooth er is involved in protein synthesis, while the rough er is not.

Explanation:

• For the first question: Vesicles are small membrane - bound sacs. They bud off from one organelle (like the endoplasmic reticulum or Golgi apparatus) and fuse with another (e.g., the plasma membrane for secretion or another organelle for delivering materials). Storing genetic information is the role of DNA in the nucleus. Synthesizing proteins (ribosomes, rough ER) and lipids (smooth ER). Providing structural support is more of a cytoskeleton function.
• For the second question: The rough endoplasmic reticulum (RER) has ribosomes attached to its surface, which gives it a "rough" appearance under a microscope. The smooth endoplasmic reticulum (SER) lacks ribosomes. DNA is stored in the nucleus. The rough ER is involved in protein synthesis (due to ribosomes) and the smooth ER in lipid synthesis.

Answer:

• First question: C. Transporting materials between organelles.
• Second question: C. The rough ER has ribosomes attached, while the smooth ER does not.