Which of the following species concepts is described by a complex group of populations that are not in direct physical or reproductive contact, but do exchange genetic material through linking populations of the same species?
A. Ring species
B. Ecological species
C. Evolutionary species
A
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During metabolism, cancer-causing ____ are generated
a. BRCA1 genes b. methyl amines c. reactive oxygen species (ROS) d. BCR-ABL proteins e. mutated tRNA fragments
In 2009, a flu pandemic was believed to have originated when viral transmission occurred from pig to human, thereby earning the designation, "swine flu
" Although pigs are thought to have been the breeding ground for the 2009 virus, sequences from bird, pig, and human viruses were all found within this newly identified virus. What is the most likely explanation of why this virus contained sequences from bird, pig, and human viruses? A) The virus was descended from a common ancestor of bird, pig, and human flu viruses. B) The infected individuals happened to be infected with all three virus types. C) Related viruses can undergo genetic recombination if the RNA genomes mix and match during viral assembly. D) The human was likely infected with various bacterial strains that contained all three RNA viruses.
The five-carbon sugar in DNA nucleotides is called RIBOSE.
a. true b. false
You are a paleontologist studying the fossil marine fauna immediately after the K–T mass extinction. You find ammonite fossils in the post–K–T layer even though ammonites are known to have vanished in the K–T ex-tinction
You submit your sensational findings to a journal, but one of the reviewers questions your claim of ammonite survival. He points to the fact that your ammonite fossil was found in rock that shows extensive burrowing activity by benthic organisms. Why does the reviewer question your conclusion? What will be an ideal response?