Molecular And Cellular Biology Exam 1 Practice

Which statement best describes the nucleus?

Command center of the cell The site of energy production It conducts ribosomes attached to its membrane Stores calcium

Correct Answer:

Command center of the cell

Explanation:

The nucleus acts as the cell’s control center: it houses the genetic material (DNA) and directs gene expression and DNA replication to coordinate all cellular activities. It’s enclosed by a double membrane with nuclear pores that regulate traffic in and out, and it contains the nucleolus where ribosomal RNA is made, with ribosomes then functioning in the cytoplasm or on the rough endoplasmic reticulum. Energy production happens in mitochondria, not in the nucleus, and calcium storage is mainly in the endoplasmic reticulum, not in the nucleus.

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