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.
C
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a. protons are transferred from one atom to another. b. neutrons are shared between two atoms to form an isotope. c. electrons are shared between two atoms to complete their octets. d. the hydrogen of one water molecule is attracted to the oxygen of another water molecule. e. electrons are transferred from one atom to another.
Which of the following choices does NOT correctly categorize the biological kingdom with the form of reproduction used by the organisms within it?
a. Protista: sexual reproduction, asexual reproduction, and conjugation b. Archaea: asexual reproduction only c. Animalia: both sexual and asexual reproduction d. Bacteria: asexual reproduction only e. Fungi: asexual reproduction only
Aspirin and other nonsteroidal anti-inflammatory drugs (NSAID) inhibit inflammation by inhibiting an enzyme in the prostaglandin pathway. However, inhibiting this enzyme also inhibits other pathways that protect the stomach from damage by stomach acid
and that form blood clots. What can you conclude from this? A) The enzyme inhibition is nonreversible. B) The enzyme is found in many different types of cells. C) Prostaglandins cause blood clotting. D) Aspirin should not be given to people who people who need to synthesize enzymes.
Targeted drugs are therapeutics designed to ________
A) treat a large class of diseases B) treat a specific disease based on the efficacy of the drug in a small population C) treat a specific disease based on the efficacy of the drug in a large population D) treat only one person