Action potential begins when which of the following occurs?
A) The inside of the neuron becomes more negative relative to the outside.
B) Sodium channels open sequentially.
C) The membrane becomes depolarized.
D) Potassium ions diffuse to allow repolarization of the cell.
B
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Which of the following statements about transport through phloem is true?
A. It is aided by root pressure. B. Transport only occurs from the roots to the shoot. C. Mostly dissolved starch is transported. D. The direction of flow can change at different times if the sources and sinks change. E. No energy is required.
The process illustrated in the accompanying figure is:
a. DNA synthesis. b. translation. c. transcription. d. a frame shift mutation. e. protein synthesis.
Which of the following statements is TRUE?
a. More than 96% of the animal kingdom is made up of invertebrates. b. Invertebrates are unique because they are a monophyletic group. c. Arthropods are the closest relatives of chordates. d. Roughly half of the invertebrates are protostomes and the other half are deuterostomes. e. Echinoderms are similar to vertebrates in that they are protostomes.
A group of prokaryotes that often live in extreme environments are:
a. archaeabacteria b. protists c. eubacteria d. fungi