Sequencing of genomes of eukaryotes, both mitochondrial and nuclear, have revealed evidence of sequence transfer from one to the other. Are such transfers ancient, recent, or both?
What will be an ideal response?
both
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Most scientists accept that the most probable
reason for the extinction of the dinosaurs was
a. the result of an asteroid impact. b. the loss of food sources. c. from being out-competed by mammals. d. gas emissions from volcanoes. e. giant tsunamis caused by earthquakes
Which statement is true of DNA's structure?
A. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. B. In DNA, adenine always base pairs with guanine and cytosine always base pairs with thymine. C. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. D. When adenine base pairs with thymine, they are linked by three hydrogen bonds. E. All four bases in DNA can be found in equal quantities.
Of the following four species, which one lies closest to modern humans?
A) Homo neanderthalensis B) Homo ergaster C) Homo habilis D) Homo erectus
Which genus is the most common resident flora of mouth surfaces?
A. Mycobacterium B. Streptococcus C. Haemophilus D. Escherichia E. Lactobacillus