The period in which modern continents were separated from an original Pangaea supercontinent, was the
A. Permian.
B. Jurassic.
C. Quaternary.
D. Carboniferous.
E. Cretaceous.
E. Cretaceous.
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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 is a trace element in the human body?
A) nitrogen B) zinc C) oxygen D) hydrogen
Which structure is the first to emerge from the germinating seed of a eudicot such as the garden bean?
A) the shoot hook B) cotyledons C) the embryonic root D) the ovary
The general goal of first-line defenses is to
A) prevent pathogen entry. B) destroy pathogens. C) isolate pathogens. D) weaken pathogens. E) tag intruders with a signaling molecule to identify them as foreign.