chapter 12
🇬🇧
In Inglés
In Inglés
Practique preguntas conocidas
Manténgase al día con sus preguntas pendientes
Completa 5 preguntas para habilitar la práctica
Exámenes
Examen: pon a prueba tus habilidades
Pon a prueba tus habilidades en el modo de examen
Aprenda nuevas preguntas
Modos dinámicos
InteligenteMezcla inteligente de todos los modos
PersonalizadoUtilice la configuración para ponderar los modos dinámicos
Modo manual [beta]
Seleccione sus propios tipos de preguntas y respuestas
Modos específicos
Aprende con fichas
Completa la oración
Escuchar y deletrearOrtografía: escribe lo que escuchas
elección múltipleModo de elección múltiple
Expresión oralResponde con voz
Expresión oral y comprensión auditivaPractica la pronunciación
EscrituraModo de solo escritura
chapter 12 - Marcador
chapter 12 - Detalles
Niveles:
Preguntas:
66 preguntas
🇬🇧 | 🇬🇧 |
The earliest stromatolites were probably formed by A) anoxygenic phototrophs. B) anoxygenic lithotrophs. C) oxygenic phototrophs. D) oxygenic lithotrophs. | A) anoxygenic phototrophs. |
What two gases were most abundant on early Earth? A) O2 and CO2 B) N2 and H2 C) CO2 and H2 D) CO2 and N2 | C) CO2 and H2 |
The earliest RNA probably functioned in A) catalysis. B) self-replication. C) both catalysis and self-replication. D) neither catalysis nor self-replication | C) both catalysis and self-replication. |
Evolution is driven by A) random mutation. B) novel metabolic pathways. C) selection pressure. D) selection pressure applied to random mutation. | D) selection pressure applied to random mutation. |
Horizontal gene transfer A) is so rare over evolutionary history that it is not considered when examining microbial evolution. B) occurs within bacterial species. C) complicates the construction of phylogenetic trees and the interpretation of specific traits in relation to evolution. D) only affects the evolution of plasmids. | C) complicates the construction of phylogenetic trees and the interpretation of specific traits in relation to evolution. |
Polyphasic taxonomy uses methods that include A) phenotypic methods. B) genotypic methods. C) phylogenetic methods. D) phenotypic, genotypic, and phylogenetic methods. | D) phenotypic, genotypic, and phylogenetic methods. |
Ribotyping A) bypasses sequencing and sequence alignments. B) exploits unique DNA restriction patterns. C) allows discrimination between species and different strains of a species. D) bypasses sequencing and sequence alignments, exploits unique DNA restriction patterns, and allows discrimination between species and different strains of a species. | D) bypasses sequencing and sequence alignments, exploits unique DNA restriction patterns, and allows discrimination between species and different strains of a species. |
The oxic atmosphere created conditions that led to the evolution of various new metabolic pathways, such as A) sulfide oxidation. B) nitrification. C) iron oxidation. D) sulfide oxidation, nitrification, and iron oxidation. | D) sulfide oxidation, nitrification, and iron oxidation. |
What was produced by photosynthesis before the cyanobacterial lineage developed on Earth? A) oxygen B) elemental sulfur C) ferrous iron D) hydrogen sulfide | B) elemental sulfur |
Which of the following statements is FALSE concerning the universal tree of life? A) Previous versions of the universal tree of life were based largely on fossils and comparative biology, which overlooked the diversity of and relationships between most prokaryotes. B) The current universal tree of life is supported by multiple genes including SSU rRNA sequences. C) The current universal tree of life depicts three domains of life, two of which are prokaryotic. D) The current universal tree of life is based on molecular sequences and completely changes our view of evolutionary relationships between eukaryotic species. | D) The current universal tree of life is based on molecular sequences and completely changes our view of evolutionary relationships between eukaryotic species. |
________ formed the semipermeable membrane-like surfaces for the earliest life forms. A) Proteins B) Hydrogen sulfide C) Lipid bilayers D) RNA | C) Lipid bilayers |
Multilocus sequence typing involves sequencing several different A) genomes. B) housekeeping genes. C) tRNA genes. D) rRNA genes. | B) housekeeping genes. |