Which of the following characteristics of group I intron splicing is not true of group II intron splicing?
A. Splicing occurs without ATP.
B. The first nucleophile is a 3' hydroxyl.
C. Catalysis does not require a protein.
D. Proteins mediate pre-RNA conformation in vivo.
B
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You are studying a population of geese in which there are two color phases, brown and gray. Color in this species is controlled by a single gene, with brown dominant to gray. A random sample of 250 geese shows that 210 are brown. What percentage of the brown geese are heterozygous? (Assume that the population is in Hardy-Weinberg equilibrium.)
A. 36% B. 43% C. 48% D. 57% E. 84% Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the Hardy-Weinberg principle? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A mishap in chromosomal partitioning during meiosis is referred to as ________
Fill in the blank with correct word.
Over evolutionary time, DNA replaced RNA as the primary molecule holding the code for genetic information because DNA is believed to be more chemically stable. Which attribute of DNA is the reason behind its chemical stability?
a) DNA lacks a free hydroxyl group on the 2?-carbon atom of its sugar. b) Unlike RNA, DNA is usually double-stranded. c) DNA does not usually form hairpin loops. d) One of the two pyrimidines found in DNA does not involve uracil. e) DNA contains thymines, which make it more chemically stable.
Severe frothy diarrhea with a "rotten-egg" smell accompanied by abdominal pain, bloating, and fever are signs and symptoms consistent with
A) balantidiasis. B) Chagas' disease. C) cryptosporidiosis. D) giardiasis. E) leishmaniasis.