If you were looking at a cell under a powerful microscope, what would tell you that it is a eukaryotic cell?

A. It is moving.
B. It has a nucleus.
C. It has DNA.
D. It has ribosomes.


Answer: B

Biology & Microbiology

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Explain what might occur when purine or pyrimidine bases in nucleotides undergo tautomeric shifts. What will be an ideal response?

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Microtubules of the mitotic spindle attach directly to each chromosome at the centromere

__________________ Indicate whether the statement is true or false.

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Which one of the following can contribute to a protein's tertiary structure?

A. ionic bonding B. van der Waal's forces C. covalent bonding D. hydrogen bonding E. All of these choices are correct.

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A network of interactions that involves the cycling of materials and the flow of energy between a community and its physical environment is a(n) ____

a. population b. community c. ecosystem d. biosphere e. species

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