Which of the following occurs in prokaryotes but not in eukaryotes?
A) post-transcriptional splicing
B) concurrent transcription and translation
C) translation in the absence of a ribosome
D) gene regulation
Answer: B
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A karyotype is produced by inducing cells to divide in culture, and then treating them with a molecule that arrests
A. interphase. B. anaphase. C. prophase. D. metaphase. E. telophase.
Packages of vegetable seeds typically include an ideal planting depth. If planted too deep, the seeds will not germinate. Why will an excess depth affect the germination of the plant?
A. Circadian rhythms are disrupted. B. Thigmotropism is disrupted. C. Statoliths can no longer move. D. Phytochromes can no longer absorb light. E. The apical meristem cannot reach the surface of the soil.
All organisms are alike in their
a. requirements for energy. b. participation in one or more nutrient cycles. c. ultimate dependence on the sun. d. interaction with other forms of life. e. all of these
A simple reflex arc is made up of a sensory receptor and
a. a sensory neuron. b. a motor neuron. c. an effector. d. all of the above.