16. Monroe uses a microscope to observe specimens in science class. The microscope enlarges objects to 100 times their actual size. Find the size of each specimen as seen in the microscope.

11. You are going to have to learn the difference between several similar-sounding terms. Figure 9.4 represents a replicated chromosome that has two sister chromatids. The narrow "waist" represents the location of the centromere. Students often get all these terms confused, so take time now to draw a quick sketch of a chromosome and label the following areas: chromosome, chromatid, centromere, chromatin.

9. Define chromatin.

What is the mRNA produced if G is inserted at the beginning of the DNA segment?

20. Sketch and label a centrosome with two centrioles.

10. Think carefully, now. How many DNA molecules are in each of your somatic cells?