The pH of blood is maintained by the respiratory and excretory system. What is the normal pH of blood?
A. 5.2
B. 6.4
C. 6.8
D. 7.4
E. 8.6
D. 7.4
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There are seemingly conflicting studies that have taken a look at whether Neanderthals interbred with human ancestors. One study of mitochondrial DNA suggests that the two groups did not interbreed
Another study, of the whole genome, suggests that they did. Which of the following could explain these results? A. Taking a look at the whole genome is much more reliable than looking at mitochondrial DNA. B. Mitochondrial DNA is more susceptible to mutations than nuclear DNA so more change would be expected. C. Mitochondrial DNA is passed on the maternal side, so if Neanderthal females did not interbreed with our ancestors, Neanderthal mitochondrial DNA would never have entered the modern human gene pool. D. Genomic DNA is more susceptible to mutations than mitochondrial DNA, so more change we be expected. E. None of the answer options is correct.
Organ formation is indicated by
a. A. b. B. c. C. d. D. e. E.
What is the relative biological fitness of an individual who is heterozygous for sickle-cell disease who lives in central Illinois vs. an individual who is heterozygous and lives in South Africa?
What will be an ideal response?
Homologous chromosomes recognize one another by their centromeres, move through the cell toward one another, and come to lie next to each other in a process called
A. crossing over. B. synapsis. C. differentiation. D. trisomy.