Alpha and beta interferons
A. help protect virus-infected cells from the effects of the pathogen.
B. protect the cells that secrete them from being invaded by a virus.
C. are produced by infected fibroblasts and macrophages.
D. produce active antiviral proteins (AVPs) that coat the surface of healthy cells and prevent the attachment of pathogenic viruses.
E. produce no adverse effects in the body.
Answer: C
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The ____ bone is the largest in the human body
a. humerus b. femur c. ulna d. tibia e. radius
Which of the following is a character in
phylogeny? a. number of digits b. DNA sequence for a gene c. amino acid sequence of an enzyme d. number of petals e. all of these
Cell differentiation of a pre-embryo begins
A) immediately upon the first division of the fertilized egg. B) after the 32-cell stage. C) after the 4-cell stage. D) after the 8-cell stage. E) after the 2-cell stage.
In some instances environmental change causes a situation where one phenotype is favored for a period of time, and then a different phenotype is favored. This oscillating selection causes
A. extinction of the population. B. an increase in point mutations. C. the maintenance of genetic variation in the population. D. high population increase to maintain phenotypic variation. E. elimination of rarer genotypes because of uneven selection.