Which species of Staphylococcus is one of the most important human pathogens?
A. Staphylococcus luteus
B. Staphylococcus aureus
C. Staphylococcus mucilaginosus
D. Staphylococcus intermedius
Ans: B. Staphylococcus aureus
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Which of the following statements is correct?
A) The simpler the organism, the less DNA it has. B) The more complex the organism, the higher the percentage of the non-coding DNA. C) The more complex the organism, the more DNA it has. D) The simpler the organism, the lower the percentage of the non-coding DNA.
Essential amino acids are amino acids that cannot be synthesized by an organism and so must be provided as nutrients.
Answer the following statement true (T) or false (F)
The major damage caused by Neisseria meningitidis is a result of
A. its invasion into the central nervous system. B. its presence in the respiratory tract of 40% of healthy individuals. C. its ability to be transmitted by droplets among people who live in close contact. D. the release of lipid A into the tissues, triggering severe inflammation and DIC. E. the fact that it can survive in cells after phagocytosis.
Some prokaryotes have specialized internal membranes that __________.
a. have attached ribosomes and function in protein synthesis b. form from infoldings of the plasma membrane and may function in cellular respiration or photosynthesisarose c. from endosymbiosis of smaller prokaryotes, evolving into mitochondria and chloroplasts d. are produced by the endoplasmic reticulum but differ in composition from eukaryotic membranes e. enclose the nucleoid and separate plasmids from the single prokaryotic chromosome