6. Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92-100. Which of the following can be true?
(A)Molybdenum atoms can have between 50 and 58 neutrons.
(B)Molybdenum atoms can have between 50 and 58 protons.
(C)Molybdenum atoms can have between 50 and 58 electrons.
(D) Isotopes of molybdenum have different numbers of electrons.

2. The evolution of one species into two or more species as a result of different populations becoming reproductively isolated from each other is best termed as_________. (A)adaptive radiation (B)creationism (C)natural selection (D) prototype

3. Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these creatures, you notice that males with longer hair get more opportunities to mate and father more offspring. To test the hypothesis that having longer hair is adaptive in these males, you should_________.(A)test whether other traits in these males are also adaptive(B)look for evidence of hair in ancestors of tamarins(C)determine if hair length is heritable(D) test whether males with shaved heads are still able to mate

4. Following a scientific method, which of the following is the correct order of steps?(A)Observation → Analysis → Hypothesis → Conclusion → Communicate results → Experiment(B)Observation → Hypothesis → Experiment → Communicate results → Analysis → Conclusion(C)Experiment → Hypothesis → Observation → Analysis → Conclusion → Communicate results(D) Observation → Hypothesis → Experiment → Analysis → Conclusion → Communicate results

5. Which of the following are compounds? (A)H2O, O2, and CH4 (B)H2O and O2 (C)O2 and CH4 (D) H2O and CH4, but not O2

7. The cities of Portland, Oregon, and Minneapolis, Minnesota, are at about the same latitude, but Minneapolis has much hotter summers and much colder winters than Portland. Why? (A)They are not at the same exact latitude. (B)The ocean near Portland moderates the temperature. (C)Fresh water is more likely to freeze than salt water. (D) Minneapolis is much windier, due to its location in the middle of North America.

8. Rank, from low to high, the pH of blood, stomach acid, and urine.(A)blood, urine, and stomach acid(B)stomach acid, blood, and urine(C)urine, blood, stomach acid(D) stomach acid, urine, blood

9. How would acidification of seawater affect marine organisms? Acidification of seawater would (A)increase dissolved carbonate concentrations and promote faster growth of corals and shell-building animals (B)decrease dissolved carbonate concentrations and promote faster growth of corals and shell-building animals (C)increase dissolved carbonate concentrations and hinder growth of corals and shell-building animals (D) decrease dissolved carbonate concentrations and hinder growth of corals and shell-building animals

10. Which of the following statements correctly describes cis-trans isomers?(A)They have variations in arrangement around a double bond.(B)They have an asymmetric carbon that makes them mirror images.(C)They have the same chemical properties.(D) They have different molecular formulas.

11. What is the explanation for how a modern transmission electron microscope (TEM) can achieve a resolution of about 0.2 nanometers, whereas a standard light microscope has a maximum resolution of about 200 nanometers? (A)Glass lenses in light microscopes refract light, which reduces resolution. (B)Contrast is enhanced by staining with atoms of heavy metal. (C)Electron beams have much shorter wavelengths than visible light. (D) The electron microscope has a much greater ratio of image size to real size.

12. Tay-Sachs disease is a human genetic abnormality that results in cells accumulating and becoming clogged with very large, complex, undigested lipids. Which cellular organelle is most likely defective in this condition? (A)the lysosome (B)the Golgi apparatus (C)the smooth endoplasmic reticulum (D) the rough endoplasmic reticulum