Question

a. semi - permeable cell membrane.
b. presence of membrane - bound organelles.
c. presence of ribosomes.
d. cytoplasm for metabolic reactions.
which organelle is the \command center\ of eukaryotic cells?
a. ribosomes
b. golgi apparatus
c. nucleus
d. endoplasmic reticulum

Explanation:

• First question: Prokaryotic and eukaryotic cells both have a semi - permeable cell membrane (a), ribosomes (c), and cytoplasm for metabolic reactions (d). But only eukaryotic cells have membrane - bound organelles (b).
• Second question: The nucleus (c) contains the cell's genetic material (DNA) and controls most of the cell's activities, acting as the "command center". Ribosomes (a) are for protein synthesis, the Golgi Apparatus (b) modifies and packages proteins, and the Endoplasmic Reticulum (d) is involved in protein and lipid synthesis.

Answer:

b. Presence of membrane - bound organelles.
c. Nucleus