a) An Enucleated ovum b) Mature RBC c) A mature spermatozoan d) Hair root

According to me, there can be 2 answers, a and b because an ovum whose nucleus has been removed lacks DNA. And also, initially RBC has a nucleus but as it matures it's nucleus disappears. So, mature RBC should also lack DNA. Then which one will be a more appropriate answer ?

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    $\begingroup$ If it's a mild trick question, then note that it doesn't say "genomic DNA" but "DNA". Enucleated ova would still have mitochondrial DNA, while mature RBC would not. $\endgroup$ – iayork Apr 14 '16 at 11:58
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    $\begingroup$ This should not be closed - OP has clearly attempted to answer and justified it! $\endgroup$ – rg255 Apr 14 '16 at 12:31
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    $\begingroup$ @layork - nice one - write it up as an answer - +1 from me :-) $\endgroup$ – AliceD Apr 14 '16 at 12:39
  • $\begingroup$ @iayork Thank You. I understood it. You can post this as an answer. $\endgroup$ – TheNewGenGamer Apr 14 '16 at 14:36
  • $\begingroup$ It should be closed! It's not a question about biology it's a stupid MCQ. it's no use to anyone else than the questioner to have it here. It's the sort of rubbish that demeans this SE. $\endgroup$ – David Apr 15 '16 at 19:17

There are two answers if the question refers to genomic DNA (neither enucleated ova nor mature RBCs have genomic DNA). However, since the question doesn't specify genomic DNA, we can exclude enucleated ova, which would still have mitochondria and therefore mitochondrial genomic DNA. Mature RBCS (at least in most mammals) do not have mitochondria, so the safest answer is probably b) Mature RBC.


First of all, 2) mature human RBCs don't have DNA. With the maturation of human red blood cells, the nucleus disappear. DNA is located in the nucleus so mature human RBCs don't have DNA.

However, your question didn't say "human RBC". Bird RBC have nucleus thus have DNA.

Then, both ovum and sperm cells have nucleus, thus have DNA, no matter which stage they are in.

I would say the possible answer be 4) hair root. The question didn't make it clear whether it's referring to the hair root cells or something else. But I would say that hair root is not made of body cells. No cell, no nucleus, no DNA.


the answer will be mature DNA. We know that except for nucleus other organelle such as mitochondria also have ability to replicate an as mentioned in the question the enucleated ovum (ovum lacking its nucleus) do have the other cell organelles, whereas for the mature erythrocytes, they lack nucleus as well as other cell organelles such as mitochondria and golgi bodies; and hence RBC can't divide on its. hope it helps!

  • $\begingroup$ You are repeating the point made by an existing answer. If you have a new point to add then please edit your answer accordingly. $\endgroup$ – WYSIWYG Sep 30 '19 at 12:00

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