If angiogenesis were not to occur, a tumor would reach the size of a ________ and stop growing
A) period on a typewritten page (.)
B) baseball
C) grapefruit
D) pea
E) basketball
D
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Gap genes, segment-polarity genes, and homeotic genes all _____
A) act independently of one another B) code for transcription regulatory factors C) can be activated at any time during development D) are unique to Drosophila embryos
How is reverse transcriptase used to clone genes?
a. Reverse transcriptase is used to make a cDNA copy of an mRNA strand. b. Reverse transcriptase is used to make a cloned DNA copy of a plasmid DNA molecule. c. Reverse transcriptase is necessary to read the information contained on the cDNA molecule. d. Reverse transcriptase transcribes RNA from cDNA in reverse order. e. Reverse transcriptase transcribes cDNA into RNA without transcription of introns.
Amish populations in Lancaster County, Pennsylvania have high rates of a rare form of dwarfism. The recessive allele that codes for this disorder is found in 1 of 14 individuals in this Amish population, in contrast to 1 in 1,000 in the general population. In Ohio, an Amish population suffers with higher than normal rates of cystic fibrosis and a host of other genetic diseases so rare that some have not yet been named. What factors have caused such severe genetic problems in these two communities?
What will be an ideal response?
One of the most straightforward ways of detecting the presence of bacteria in food is to use ________.
A) a standard plate count B) spectrophotometry C) staining