A gram negative bacillus was recovered from the uring of a child with a history of recurrent urinary tract infections. The organisms was oxidase negative, non-lactose fermenter, indole negative urease positive, motile, and ornithrine decarboxylase positive. The most likely identification of this organism would be :
A. Proteus mirabilis
B. Shigella Sonnei
C. Escheriv=chia coli
D. Klebsiella pneumoniae
Ans: C. Escheriv=chia coli
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The diploid character of eukaryotic cells may mask the appearance of a mutation since
A. this may be a frameshift. B. the mutation is often reversible. C. the mutation may create inverted repeats. D. the matching chromosome may carry the dominant gene.
What is the sex chromosome composition of a person with Klinefelter syndrome?
a. XXX b. XO c. XXY d. XYY e. YY
________ allow(s) the influenza virus to recognize and attach to body cells before infecting them.
a) NA spikes b) HA spikes c) The lipid bilayer d) The protein coat
The t-stat, a specific instance of a test statistic, is used to evaluate a null hypothesis concerning which population parameter of a random variable?
A. The size of the sample B. The variance C. The mean D. The r-squared