Which of the following traits would not be considered multifactorial?
A. ABO blood type
B. cleft lip/palate
C. alcoholism
D. diabetes
E. suicide risk
Answer: A
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A microbiologist is attempting to determine the size of a microbial population and has employed several methods. She noticed that the direct count she obtained using a counting chamber and microscope was much higher than her estimate from doing a viable plate count. This discrepancy was encountered during multiple trials. What is the most likely reason for the discrepancy?
A. She counted incorrectly. B. She did not correctly do the serial dilutions prior to the viable plate count. C. The medium and growth conditions used for the viable count will not support the growth of the organisms. D. Many of the organisms viewed during the direct count may be dead. E. The organisms were not readily cultured on the viable count, either because many were dead or because the medium and growth conditions used for the viable count will not support the growth of the microorganism.
Sally and George are worried that their preteen children will catch an STD or even develop cancers of the penis or cervix. What precautionary measures can the children take, according to this chapter?
What will be an ideal response?
In studying T cell proliferation (cell division) in response to a specific antigen, you decide to stimulate these T cells with antigen and examine the genes that are activated by the interaction. To do this, following stimulation you should isolate
A) DNA. B) rRNA. C) mRNA. D) tRNA. E) plasmid DNA.
Which of the following is not considered a plant organ?
A. leaf B. stem C. root D. flower E. seed