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
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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.
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
Explain what might occur when purine or pyrimidine bases in nucleotides undergo tautomeric shifts. What will be an ideal response?
Microtubules of the mitotic spindle attach directly to each chromosome at the centromere
__________________ Indicate whether the statement is true or false.