Cann's studies involving mitochondrial DNA showed that the two deepest branches of the human family tree are African. Which of the following observations explains this statement?
A. that all humans evolved in Africa and only
later migrated to other places
B. that our closest ancestors moved out of
Africa and then evolved into humans
C. that our closest ancestors migrated to two
other continents
D. that all the humans that evolved in Africa
only migrated to two continents
E. None of the answer options is correct.
A
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Which of the following is not a function of histone H1?
A. stabilizing nucleosomes B. promoting higher order chromosome structure C. enhancing the repression of transcription by nucleosomes D. binding to regions undergoing active RNA synthesis E. All of these options are functions of histone H1
The primary interest of genetic research into stem cells is the desire to be able to clone a human being
Indicate whether the statement is true or false
If an X-linked recessive gene is expressed in 4 percent of the men, what proportion of women would
express the recessive trait? What will be an ideal response?
Class II MHC genes code for
A. all HLA antigens. B. certain secreted complement components. C. receptors located primarily on macrophages and B cells. D. self receptors recognized by T lymphocytes. E. All of the choices are correct.