Hemolytic uremic syndrome is caused by
A. Escherichia coli O157:H7.
B. Serratia marcescens.
C. Proteus mirabilis.
D. Bacteroides fragilis.
E. Salmonella typhi.
Answer: A
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Why do normal nucleotides need to be included in the Sanger sequencing reaction mix?
a. so the DNA polymerase has a substrate to work with b. to enhance the action of the dideoxynucleotides c. so a longer sequence (up to 300 additional base pairs) can be determined than without (normally 200 bp). d. so multiple sequences of different lengths will be generated e. to prevent the DNA polymerase from making too many errors
The decline in an individual's fertility, with a corresponding decrease in the likelihood of survival, is known as ________
Fill in the blank(s) with correct word
The multi-level grouping of individual organisms is a means of
A. classification. B. identification. C. reduction. D. minimization.
Reptiles are better adapted to life on land than are amphibians. Which external characteristic would a reptile have to lose to make it roughly externally equivalent to an amphibian in terms of ability to tolerate dry land?
A. limbs B. eyelids C. vertebral column D. scales