Which of these would be considered a transgenic organism?
a. a houseplant propagated from the cuttings of another houseplant
b. a fern grown in cell culture from a single fern root cell
c. a rat with rabbit hemoglobin genes
d. a bacterium that has been treated with a compound that affects the expression of many of its genes
e. a human treated with insulin produced by E. coli bacteria
c. a rat with rabbit hemoglobin genes
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Researchers trying to determine the genetic basis of a rare metabolic disease have been examining the pedigrees of three families affected with the disease
For all of the families, the disease is coinherited with markers on chromosome 2 and chromosome 8 . They later observe that family members show no disease if they have the defect on only chromosome 2 or on only chromosome 8 . At this point the researchers could conclude that: A. the disease is caused by defects in two or more genes on different chromosomes. B. the gene product of chromosome 2 combines with the product from chromosome 8 to form defective protein. C. family members with no disease have mutations that compensate for the defects on chromosome 2 or 8 D. the same disease can be caused by defects in single genes on different chromosomes. E. family members with the single defect have normal cellular function.
Based on this study, FOXP2 must be expressed in which tissues?
A. brain B. muscle C. muscle and brain D. nerves in the ear E. muscle and nerves in the ear
Mast cells ____
a. circulate in the bloodstream b. degranulate in response to signaling molecules secreted by endocrine and nerve cells c. respond to normal flora d. release signaling molecules that cause arterioles to constrict e. engulf and digest pathogens
Which of the following is a mismatched pair:
1. local infection - restricted to small area 2. viremia - viruses traveling in the blood 3. secondary infection - symptoms reoccur occasionally for years after an initial infection (ex. genital herpes) 4. acute infection: rapid onset of symptoms 5. focal infection: original location of spreading infection