A cell with a nucleus. The opposite is a prokaryote; a cell without a nucleus.
Answer:
where is the picture or what is it talking about?
Trial and Error
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I believe the answer is a Meander. (beware that this is actually a geography question not a biology one, please put it in the right section next time and it will be answered quicker!)
Because enzymes connect to their substrate through a lock-and-key system, where the shape of the substrate and the enzyme has to fit like puzzle pieces. Then only the enzymatic reaction can occur.
