If a single-celled organism is found to have a nucleus which contains its DNA and a phospholipid membrane, what else can safely be assumed about it?
It is a member of the domain Eukaryota even though it cannot reproduce on its own.
It has mitochondria and is a member of the domain Eukaryota.
It has a cell wall and can photosynthesize and could belong to the domain Bacteria.
It has no other organelles besides the nucleus and is a member of the domain Bacteria.
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@Ninhi5 You can't just give the answer. In OpenStudy you have to explain why that answer is correct or not.
It has mitochondria and is a member of the domain Eukaryota
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I believe @sana_memon is correct, relative to the other answers in the question.
The presence of a nucleus strongly indicates your organism is a member of the eukaryotic domain (therefore you can eliminate choices three and four). Between choices one and two, two is the more logical one. Choice one is incorrect: there are plenty of single-celled organisms which can reproduce just fine on their own. And for the most part, choice two is safe - almost all eukaryotes have mitochondria.
There are, of course, exceptions (as always, when dealing with the diversity of life!). Certain groups of protists have members which lack mitochondria. That's not to say they didn't ever have them - rather, at one point, they did possess mitochondria, but now they have been modified and reduced over the course of evolution. See mitosomes and hydrogenosomes for examples of these odd adaptations.