What does it mean when we say, "This scientific study was published in a peer-reviewed journal"?
A. This study was evaluated by qualified and impartial experts before being published.
B. This study can now be viewed on the Internet.
C. This study was not evaluated by other scientists.
D. This study was published in a newspaper.
Answer: A
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The normal human microbiota is considered part of the 1st line of defense because
A. microbiota cause an inflammatory response, eliminating pathogens. B. resident bacterial cells stimulate phagocytosis of pathogens. C. microbial antagonism keeps potential pathogens in check. D. pathogens and normal biota cannot exist in the same location.
Phenylketonuria (PKU) is a recessive human disorder in which an individual cannot appropriately metabolize a particular amino acid. This amino acid is not otherwise produced by humans. Therefore the most efficient and effective treatment is which of the following?
A) Feed them the substrate that can be metabolized into this amino acid. B) Transfuse the patients with blood from unaffected donors. C) Regulate the diet of the affected persons to severely limit the uptake of the amino acid. D) Feed the patients the missing enzymes in a regular cycle, i.e., twice per week.
Decrease friction; controls vessel permiablilty; absorption and secretion
A. Pseudostratified columnar B. Simple columnar C. Simple cuboidal D. Simple squamous E. Stratified squamous F. Transitional
Dennis had a history of heart disease in his family and was reducing his intake of saturated fats. Saturated means each carbon atom is bonded to as many hydrogen atoms as it can accept. If a carbon were bonded to two carbons, how many hydrogens could it accept?
A. 0 B. 1 C. 2 D. 3 E. 4