Among the virulence factors produced by Staphylococcus aureus are hemolysin, coagulase, hyaluronidase, and enterotoxin. Which of these factors contribute to the ability of S. aureus to invade the body?
A) coagulase
B) enterotoxin
C) hemolysin
D) hyaluronidase
E) coagulase and hemolysin
D
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Due to gene transfer between the organelles and the nucleus,
A) mitochondrial genomes in all species have the same genes. B) a chloroplast from one plant species can be transferred to any other plant species. C) mitochondria and chloroplasts have genes that allow them to live independently. D) some proteins must be imported into organelles for their function. E) organelle genomes experience lower rates of mutation than they would if gene transfer did not occur.
What is the type of speciation that can occur in
an instant with a change in chromosome number? a. temporal b. mechanical c. behavioral d. ecological e. polyploidal
In clinical trials, control groups of individuals who receive a safe but noneffective treatment instead of the drug being studied are being given ________
A) stem cells B) a placebo C) a double-blind trial D) efficacy E) None of these choices
All of the following bases are found in RNA molecules EXCEPT
A. adenine. B. thymine. C. uracil. D. cytosine. E. guanine.