All of the following are true of irradiation methods used for food preservation and sterilization EXCEPT
A) they prolong shelf-life of fruits and vegetables.
B) residual radioactivity is left behind on many foods.
C) ionizing radiation such as X rays or gamma rays is used.
D) they are used for the sterilization of many spices.
E) they greatly reduce the number of pathogens present in meats and poultry.
B
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The study of diseases associated with excesses and deficiencies of the immune system is ________.
A. epidemiology B. immunopathology C. humoralpathology D. histopathology E. hemopathology
Which of the following best describes which chordate characteristics lancelets retain as adults?
A) Pharyngeal gill slits, limbs, and lobed fins B) Dorsal nerve cord, jaws, limbs, and lobed fins C) Post-anal tail, hair, jaws, and amniotic egg D) Notochord, lobed fins, and jaws E) Notochord, dorsal nerve cord, post-anal tail, and pharyngeal gill slits
Mutations in the nucleic acid sequence of a gene can sometimes direct the substitution of one amino acid for another in the encoded protein. Which amino acid substitution would be most likely to severely disrupt the normal structure of a protein?
A.) asparagine to threonine B.) leucine to isoleucine C.) tryptophan to phenylalanine D.) alanine to glycine E.) methionine to arginine
Which of the following types of microscopes provides a 3-dimensional image of the surface of cells and viruses?
A. Transmission electron microscope B. Scanning electron microscope C. Brightfield microscope D. Darkfield microscope