The research of James A. Thompson and his coworkers shows that sustainable human stem cell
colonies can be established. As experimental evidence of this, they showed that
a. human stem cell colonies could survive outside the body if exposed to a bed of mouse
fibroblasts.
b. stem cell telomerase remained inactive in established cell colonies.
c. cultured stem cells could differentiate when injected into apes.
d. cultured stem cells could differentiate when injected into chicken embryos.
e. human stem cells could on differentiate into muscle tissue.
A
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Peter Sheldon found that the number of “ribs” in which of the following groups changed over a 3
million year period with no evidence of speciation?
a. horses d. humans b. trilobites e. octoprocts c. insects
Which type of mutation is least likely to revert?
A) deletion B) transition C) transversion D) insertion E) All are equally likely.
Which protists have a flagellum surrounded by a "collar" of threadlike projections, in which movement of the flagellum sets up a current that draws food-laden water through the collar?
a. amoebozoans b. choanoflagellates c. rhizarians d. green algae e. stramenopiles
Which molecule is composed of a chain of amino acids?
A) carbohydrate B) lipid C) protein D) nucleic acid