The most common form of carbon atom has 6 protons, 6 electrons, and 6 neutrons; which combination of subatomic particles would represent a different isotope of carbon?
A) 8 protons, 6 electrons, 6 neutrons
B) 6 protons, 8 electrons, 6 neutrons
C) 8 protons, 8 electrons, 8 neutrons
D) 6 protons, 6 electrons, 8 neutrons
E) 5 protons, 6 electrons, 6 neutrons
Answer: D) 6 protons, 6 electrons, 8 neutrons
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If the two parents are each heterozygous for widow's peak and having freckles, what is the chance that any of their children will have the same phenotype?
A) 9/16 B) 3/16 C) 1/2 D) 1/16
An enzyme that works in the stomach may not work in the small intestine because
A. the pH of the stomach contents is different than that found in the intestine. B. the temperature is so different that the enzyme will be inhibited from taking action. C. enzymatic competition will result in the denaturation of the substrate. D. there will not be enough collisions to result in enzyme-substrate formation.
In M. xanthus, ________ motility is a kind of twitching that is governed by the production of retractable type IV pili, only observed when cells are in a group.
Fill in the blank(s) with the appropriate word(s).
The epithelial tissue of animal cells is most similar to the ________ of plant cells?
A. xylem B. phloem C. dermal D. ground E. vascular