This organism, belonging to the family Enterobacteriaceae, grows best at 25°C to 30°C. Domestic and wild rats and other animals can carry this organism. What is the medium of choice?
a. MacConkey agar
b. Xylose-lysine-deoxycholate (XLD) agar
c. Cefsulodin-irgasan-novobiocin (CIN) agar
d. Hektoen enteric (HE) agar
C
Yersinia grows best at 25°C to 30°C and is carried by wild rats. CIN agar is a selective medium specifically used for the isolation of Y. enterocolitica from gastrointestinal specimens.
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Which of the following explains why the human population has so many phenotypic differences?
A. The majority of our genome consists of noncoding DNA. B. The majority of our genome consists of DNA that codes for proteins. C. Recombination allows for new genetic combinations. D. The genes that code for what we look like are more susceptible to mutation than other genes. E. None of the answer options is correct.
Which of the following best describes the translational elongation process?
A. tRNA molecules condense with rRNA molecules. B. Ribonucleotides are added to amino acids through the synthesis of phosphodiester bonds. C. The polypeptide chain is lengthened by synthesizing peptide bonds between amino acids. D. Ribosomal proteins aggregate to form polysomes.
You wanted to test a single fruit fly for the presence of the TOLL protein , so you prick it with a needle coated in fungal spores. The fly dies 2 days later. Which of the following statements is TRUE?
A. The TOLL protein is only found in humans. B. This is evidence that the TOLL protein is not present. C. This is evidence that the TOLL protein is present. D. This is inconclusive evidence.
Figure on p. 737
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Use the figure above showing the process of gastrulation to answer the following question.
The letter "A" in the accompanying figure represents ____.
A. ectoderm B. endoderm C. mesoderm D. neural plate E. yolk