Changes that have occurred in living organisms over the past four billion years are due primarily to
A. extinction of species.
B. continental drift.
C. changes in geological periods.
D. interaction of genetic changes and environmental changes.
E. the change in the orbit of the moon, causing mass extinction due to volcanic activity.
D. interaction of genetic changes and environmental changes.
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Some Mycoplasmas, such as M. mobile, can move at a steady pace across a solid surface by using ________ ________.
Fill in the blank(s) with the appropriate word(s).
Weightlifters, bodybuilders, and other athletes who require rapid bursts of high-energy muscle output often spend a lot of money on dietary supplements
Some supplements, such as amino acids, are used as building blocks to make more high-protein muscle cells. Other supplements increase energy or provide more endurance during workouts. For example, supplements that contain creatine (often sold as creatine diphosphate) are reputed to provide more energy. Based on this information and your knowledge of muscle physiology, would you expect creatine supplements to provide extra energy? Why or why not? A) No, because the digestive system breaks creatine (a large protein macromolecule) down before it can be used by the body. B) Yes, because creatine is used directly as a source of energy by muscle cells. C) No, because creatine is not used for energy production in the body. D) Yes, because the creatine supplement can donate phosphate ions to regenerate ATP.
How do some bacteria respond to adverse environmental conditions?
a. Bacteria shrink in size. b. Bacteria form endospores. c. Bacteria release exotoxins. d. Bacteria develops a cyst and fills it with fluid. e. Bacteria build up more protein in their capsules.
Automated floats such as the Argo system can be used to
A) Take pictures of whales and other diving mammals. B) Measure water temperature at 2,000 m. C) Forecast the tracks of hurricanes. D) Identify plankton from their DNA.