Which of the following tests is an agglutination test for the bacterium causing typhoid fever?
A. Widal test
B. IMViC
C. Quellung reaction
D. API 20E system
Answer: A
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Which one of the following describes an event that takes place during gene regulation at the level of the chromosome?
A. Chromatin becomes condensed in order for transcription to begin. B. Chromatin coils so it can become more accessible to the proteins that carry out transcription. C. RNA polymerase and associated proteins bind to nucleosomes. D. Chromatin is remodeled and nucleosomes are repositioned so that specific regions of the DNA can be made available for transcription. E. Cytosine bases in the sequence near the promoter of a gene become methylated in order to stimulate transcription.
In humans, which of these structures is not made of cartilage?
A. tip of the nose B. outer ear C. intervertebral disks of the backbone D. knee cap E. larynx
Positive control of the LAC operon can be best described by which of the following:
a. occurs when glucose concentration is limiting b. occurs when cAMP concentrations are high c. results in RNA polymerase binding to the promoter d. directly occurs due to the binding of cAMP-CAP complex e. all of the above
The highly toxic cyanide poison binds to the last
molecule in the electron transfer chain, halting additional electron transfer. What is the consequence? a. Oxygen can’t pick up electrons. b. No more water will be formed. c. No more ATP will be formed. d. The affected individual will not survive. e. All of these are a consequence.