Practice question
Question
Consider the following statements about the number of nuclei in cells:
I. A cell normally contains one nucleus.
II. Variations in nuclear number are frequently observed.
III. Mature erythrocytes of many mammals and sieve-tube cells of vascular plants may lack a nucleus.
Which option correctly evaluates these statements?
Explanation
One nucleus per cell is the usual condition, but variations in nuclear number occur. Some specialised mature cells, including erythrocytes of many mammals and sieve-tube cells of vascular plants, lack a nucleus.
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