A food web is generally simpler to visualize than a food chain.
Answer the following statement true (T) or false (F)
False
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Which of the following is not part of a yeast artificial chromosome (YAC)?
A. a CEN sequence B. an ARS C. a selectable marker D. the F factor
Which of the following statements about oxygen is false?
A. Oxygen is the only potential electron acceptor available on Earth's surface. B. Only the oxidation of organic molecules by O2 provides sufficient energy to support large, active organisms. C. Oxygen concentrations in the atmosphere favor diffusion into the interior cells of organisms. D. Oxygen is necessary for complex multicellular life. E. Oxygen became abundant in the atmosphere 580-560 million years ago.
Which feature is best associated with hyphae?
A. strong, impermeable walls B. rapid growth C. large surface area D. pigmented cells E. Both b and c are correct
The onset of puberty
A. is typically earlier in girls than boys. B. involves increased production of estrogen or testosterone. C. causes changes in body structure. D. All of the above are correct.