A theory of eukaryotic cells and nuclear origin is based on endosymbioses, where an archaeal cell is thought to have engulfed a bacterium, which then donated genes that would eventually become the nuclear genome of an ancestral eukaryote.
Answer the following statement true (T) or false (F)
True
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Animals that have the four basic characteristics of chordates plus a vertebral column are
(a) invertebrates. (b) hemichordates. (c) cephalochordates. (d) vertebrates.
If a cell has a greater concentration of solute than its environment, the cell
A. is isotonic to the environment. B. will not experience a net gain or loss of water. C. will die. D. is hypertonic to the environment. E. is hypotonic to the environment.
A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with
A. temperatures above 37°C. B. high salt. C. carbon dioxide. D. high acidity. E. oxygen.
Under what conditions would you expect a plant to have the highest concentration of abscisic acid (ABA)?
A) wet tropical rain forest B) cool environment after a heavy rain C) houseplant growing in low light conditions D) desert after a long drought