Question

You observe a sample under a microscope. It is 5 µm in diameter and has a nucleus. What would it most likely be?

A. A single strand of hair.
B. A sperm cell.
C. An ovum (egg cell).
D. A bacterial cell.

Answer 1

Based on your observation, the sample that you observed under a microscope, which is 5 µm in diameter and has a nucleus, is most likely a bacterial cell.

Single strands of hair and sperm cells are much smaller than 5 µm in diameter and do not have a nucleus, while an ovum (egg cell) is much larger than 5 µm in diameter. Bacterial cells, on the other hand, are typically in the range of 0.2 to 10 µm in diameter, and have a nucleus-like region in the nucleoid.