The placement of an organism into a domain is made on the basis of
A) G + C content.
B) cell ultrastructure.
C) ribosomal RNA analysis.
D) serological tests.
E) Gram-stain reactions.
C
Bloom's Taxonomy: Comprehension
Section: Classification and Identification of Microorganisms
Learning Outcome: 4.22
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An intermediate in the creation of DNA nucleotides is ribose 5-phosphate, shown here. What enzymatic activity is needed to ready ribose 5-phosphate for use in DNA nucleotide synthesis?
A. DNase B. reductase C. oxygenase D. RNase E. RNA polymerase
Within the CNS, groups of neuronal cell bodies that are clustered together to perform basic functions are termed
A. soma. B. nuclei. C. spinal cords. D. nerve nets. E. ganglia.
Compared to a solution with a pH value of 4, a solution with a pH value of 2 has ________ H+ ions
A) half as many B) twice as many C) one hundred times as many D) one hundred times fewer E) the same number of
A researcher is interested to test the hypothesis that a 100 base pair stretch of a given gene is under selection
She sequences this gene region in 30 individuals, each of two populations. She finds that within either popula-tion, there are 33 synonymous sites of which 10 are segregating for different alleles in the population. In this same sequence, she observes 29 sites within-populations that possess variable alleles at nonsynonymous sites. In contrast, when she compares substitutions across species, she finds that of the 33 synonymous sites only five show signs of a substitution between species. Only 15 nonsynonymous substitutions were observed between species. This suggests that the gene is: a. under purifying selection. b. under nearly neutral selection. c. under positive selection. d. under directional selection. e. This cannot be determined based on the information provided.