Which type of muscle tissue contains fibers that are uninucleated and nonstriated?
A. skeletal
B. cardiac
C. smooth
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Enterotoxins are ________.
A. proteins B. exotoxins C. toxins that target the intestines D. virulence factors E. All of the choices are correct.
DNA replication occurs in the ________ of the cell cycle
Fill in the blank(s) with correct word
How does the phenomenon of horizontal gene transfer muddle the concept of monophyletic groups?
A. 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. B. 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. C. 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. D. 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.
The Embden-Meyerhof pathway is very important in the catabolism of glucose and other sugars in the cell. The first step of this process is the conversion of glucose to glucose-6-phosphate. This can be carried out by a hexokinase enzyme (via substrate-level phosphorylation) or by ____
a) ABC transport b) group translocation c) ATP synthase d) ligase e) polymerase