All of the following organisms produce exotoxins EXCEPT
A) Salmonella typhi.
B) Clostridium botulinum.
C) Corynebacterium diphtheriae.
D) Clostridium tetani.
E) Staphylococcus aureus.
A
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When comparing DNA sequences of similar genes for proteins in related species, you see that some of the sequences are longer in one species compared to the other
Which of the following would most likely represent the extra number of bases that you would see? A. 5 B. 7 C. 17 D. 21 E. 25
A ring species is one in which ____
a. a clinal variation occurs b. all of the various populations can mate successfully c. an area's climate interferes with speciation d. none of the various populations can mate successfully e. only intermediary populations can mate successfully
How did researchers establish the connection between chimpanzees and humans? How did researchers establish the connection between chimpanzees and humans?
Why are epithelial membranes not very thick?
A. Epithelial tissues can only reach a certain thickness because their growth is constrained by microtubules inside the cell membrane. B. Thick epithelial tissues would collapse due to the drying effect of the environment. C. Epithelial tissues are programmed to stop dividing after only a few cell cycles. D. Epithelial tissues are required to support other cells growing on top of the tissue. E. Epithelial tissues play a critical role in transport and must be thin to allow diffusion to occur.