The skull of the chimpanzee and human are most
closely related
a. as 48-hour embryos.
b. as adults.
c. as adolescents.
d. as infants.
e. never; they are not structurally close.
Answer: d
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Lysosomes are bags of digestive enzymes found in prokaryotic cells
Indicate whether this statement is true or false.
Which of the following mammals have been
successfully cloned? a. mice and rabbits b. pigs and cattle c. goats and mules d. horses and cats e. all of these
Fred Griffith discovered that when he injected mice
with a mixture of dead pathogenic S cells and living harmless R cells of Streptococcus pneumoniae a. the harmless dead S bacteria became pathogenic and killed the mice. b. the mice died, and their bodies teemed with living pathogenic S strain cells. c. the pathogenic S strain was transformed into the harmless R strain. d. the mice lived, and their bodies teemed with living harmless R strain cells, and the pathogenic S strain cells were eliminated. e. all of these occurred.
The atmosphere became rich with oxygen due to the activity of:
A) plants B) bacteria C) eukaryotes D) cyanobacteria E) multicellular animals