A cell is isolated for microscopy. It is observed to have supercoiled DNA with histones. Which of the following would also be observed?
A) Single circular chromosome
B) Nucleus
C) Freely floating nuclear material
D) No organelles

Question

Quizplus · Accepted Answer

The presence of histones indicates that the cell has a nucleus, so option B is the best choice. A single circular chromosome (option A) is seen in prokaryotic cells, and the presence of histones excludes this possibility. Freely floating nuclear material (option C) may be seen in prokaryotic cells or in eukaryotic cells undergoing mitosis where the nuclear envelope has disassembled. The presence of histones indicates that the DNA is complexed with proteins and not freely floating. Option D is incorrect as eukaryotic cells have organelles like mitochondria, endoplasmic reticulum, etc.

A Cell Is Isolated for Microscopy