Split or interrupted genes have been found in eukaryotes but not in bacteria or archaea.
Answer the following statement true (T) or false (F)
True
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Where did Earth's atmosphere originate?
a. Earth's gravity trapped gasses from passing comets. b. Gases were released from the Earth itself as it cooled. c. The atmosphere was derived from dust particles from the original gas cloud around the planet. d. Earth’s gravity trapped gasses from passing comets, gases were released from the Earth itself as it cooled, and the atmosphere was derived from dust particles from the original gas cloud around the planet. e. Gases were released from the Earth itself as it cooled and the atmosphere was derived from dust particles from the original gas cloud around the planet.
Steroid hormones do not require a membrane receptor because they:
a. are small enough to pass directly through pores in the membrane b. are lipid-soluble and pass through the bilayer c. pass through special channels d. are water-soluble e. dissolve in the cholesterol of the membranes
Fraternal twins (dizygotic) result from the fertilization of
A. two eggs and two sperm. B. two eggs and one sperm. C. one egg and two sperm. D. one egg and one sperm. E. two eggs and one sperm OR one egg and two sperm.
With regard to RNA polymerase proofreading ability, which of the following is true?
A) RNA backtracking can remove noncomplementary nucleotides. B) RNA and DNA polymerase proofreading are essentially identical. C) There are specialized mRNA repair pathways that remove noncomplementary nucleotides. D) No proofreading occurs. E) A 3' ? 5' exonuclease fixes all errors in mRNA.