Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and are allowed to replicate for two generations. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one light and one half-heavy band
B. one half-heavy (intermediate to heavy and light) band
C. one heavy band
D. one heavy and one half-heavy band
E. one light band
Answer: A
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Actin bundles give shape and support to the ________ found in cells of the small intestine.
A) centrosomes B) microtubules C) microvilli D) nuclei E) lamellipodia
How much larger do eukaryotic cells tend to be than prokaryotic cells?
a. 150–1000 times larger b. 10–100 times larger c. 5–10 times larger d. 1000 times larger or more
Most of the microbes that live in the water and soil are _____, meaning that they live off of decomposing matter
Fill in the blank(s) with the appropriate word(s).
Three principal types of bonds hold multiple atoms together. These are:
A) phosphate bonds, disulfide bonds, and hydrogen bonds. B) hydrogen bonds, ionic bonds, and glycosidic linkages. C) covalent bonds, ionic bonds, and hydrogen bonds. D) covalent bonds, ionic bonds, and disulfide bonds. E) ionic bonds, hydrogen bonds, and ester bonds.