The nucleolus organizer region (NOR) is responsible for production of what type of cell structure?
A) ribosome
B) endoplasmic reticulum
C) nucleolus
D) mitochondria
E) chromatids
Answer: A
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Which of the following domains consists of organisms whose cells lack nuclei?
a. Bacteria and Eukarya b. Archaea and Eukarya c. Archaea and Bacteria d. all of the choices
Broad term for any DNA segment that moves about in the genome
Match the description with the appropriate term.
The structures labeled "B" in the accompanying figure ____
a. prevent movement of materials between cells b. are found in tissues subjected to stretching c. allow the free passage of materials between cells d. are found mostly in heart muscle e. are found in most tissues except in the stomach
Please choose the answers that correctly describe the virulence factors of Staphylococcus aureus.
> Coagulase enzyme causes blood plasma to clot. > Staphylokinase enzyme destroys red blood cells. > Penicillinase enzyme allows S. aureus to grow in the presence of penicillin. > Hyaluronidase enzyme promotes invasion of host tissues. > Lipase enzyme causes a fever in the host.