People who have a single X chromosome are female, while those with XXY sex chromosomes are males. In order to be a female, a human
A. cannot have an X chromosome.
B. must have only one X chromosome.
C. must have two X chromosomes.
D. cannot have a Y chromosome.
E. must have only one Y chromosome.
Answer: D. cannot have a Y chromosome.
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In temperate-zone lakes, a __________ and a fall overturn cause vertical mixing of waters and trigger
a burst of productivity. Fill in the blank(s) with the appropriate word(s).
What is the function of the epidermis?
A. Secretion of lignin B. Pliable structural support C. Photosynthesis D. Forms protective cover on older stems and roots E. Control of gas exchange and water loss
You measure the amount of enzyme activity in the presence of compound X and note that as you add more substrate the amount of enzyme activity increases. This indicates that the compound X is an
A. competitive inhibitor. B. activator. C. non-competitive inhibitor. D. allosteric inhibitor. E. enzyme.
You are a paleontologist trying to find fossils that represent intermediate forms in an evolutionary transition. Which of the following pieces of information could help you identify a geological formation for your search?
a. Based on the fossil record the evolutionary transition must have taken place 210 to 230 million years ago. b. Transitional fossils likely had long spines. c. The organisms' hard shells would have made fossilization likely. d. The transition is predicted to have taken place in shallow inland seas. e. A and D.