The fluid immediately surrounding the human
embryo is contained in the
a. allantois.
b. placenta.
c. chorion.
d. amnion.
e. yolk sac.
Answer: d
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How does the phenomenon of horizontal gene transfer muddle the concept of monophyletic groups?
A. Monophyletic groups are based on the concept that a particular group of species descended from a common ancestor. When horizontal gene transfer occurs in the common ancestor, any species to which it gives rise can no longer be considered descendent species. B. Monophyletic groups are based on the concept that a particular group of species descended from a common ancestor. When horizontal gene transfer occurs, not all of the genes in a species were inherited from the common ancestor. C. Monophyletic groups are based on the concept that members of a particular group of species are related to one another at a particular taxonomic rank. However, a species that undergoes horizontal gene transfer no longer belongs to that taxon and the group becomes paraphyletic. D. Monophyletic groups are based on the concept that members of a particular group of species are related to one another at a particular taxonomic rank. An unrelated species that undergoes horizontal gene transfer can become more closely related to members of a different group, making that group polyphyletic.
The activation energy of a reaction refers to the
minimum amount of energy a. released by the reaction. b. in the reactants. c. in the products. d. necessary to cause a reaction to proceed on its own. e. difference between the energy of the reactants and the energy of the products
New polypeptide chains for proteins are assembled on
a. Golgi bodies. b. lysosomes. c. ribosomes. d. peroxisomes. e. centrosomes
Common signs of bleeding in the upper gastrointestinal tract include all of the following, EXCEPT:
A) melena. B) hematochezia. C) hematemesis. D) dark, tarry stools.