Which could be a topic for a community-level study of a hydrothermal vent ecosystem?
A) the genetic relationships between crabs at the vent and other areas of the ocean
B) the evolution of a certain species of bacteria in response to the changing composition of the water emitted by the hydrothermal vents
C) the composition of the water emitted by hydrothermal vents
D) the interactions between crabs and other species near hydrothermal vents
Answer: D
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Read the following scenario to answer the following question. Cellular respiration converts the energy of fuel molecules to a form of energy that a cell can use to perform work. In an average day, most adult humans need to consume about 2,000 Calories to maintain their health. However, the exact amount of dietary Calories a person needs depends upon many factors, including the person's age, physical activity, size, and health. Foods that we consume vary greatly in their nutritional content and quality. A large hard-boiled egg, for example, has about 75 dietary Calories and contains about 70% of our recommended daily intake of cholesterol. If a person eats one hard-boiled egg and digests the egg fully, cellular respiration will convert most of this energy into ________.
a. carbon dioxide b. sugars c. heat d. ATP e. none of the above
Which of the following sequences is in the correct order for the cyclic process by which a myosin head generates force on an actin filament for muscle contraction?
A) power stroke, crossbridge formation, crossbridge dissociation, cocking of myosin head B) crossbridge formation, power stroke, crossbridge dissociation, cocking of myosin head C) crossbridge formation, cocking of myosin head, power stroke, crossbridge dissociation D) crossbridge formation, crossbridge dissociation, cocking of myosin head, power stroke E) crossbridge formation, power stroke, crossbridge dissociation, power stroke, cocking of myosin head
If you isolate a pancreatic beta cell and put it in the proper growth conditions, it will divide by mitosis and produce new beta cells, but it will not produce pancreatic alpha cells or pancreatic cells that release digestive enzymes. The pancreatic beta cell is
A. unipotent. B. pluripotent. C. impotent. D. totipotent. E. multipotent.
Which type of molecule is composed of (CH2O) units?
A) carbohydrate B) lipid C) nucleic acid D) protein