The outer cell layer of the blastocyst becomes the ________, which forms the embryonic portion of the placenta
A) chorion
B) inner cell mass
C) primitive streak
D) yolk sac
E) embryonic disk
A
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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.
A slow-twitch muscle fiber
A. uses ATP quickly in short, fast contractions. B. has many capillaries. C. is low in myoglobin content. D. works aerobically. E. All of the answer choices are correct.
Select one of the options below and compare and contrast the paired terms:A
primary and secondary immune response B. passive and active immunity C. artificial and natural immunity What will be an ideal response?
Why is there often a lot of backlash and stigma surrounding GMO crops?
What will be an ideal response?