Which of the following pathogenic characteristics would best allow Brucella organisms to produce a chronic infection in a host?
a. weakened inflammatory response
b. resistance to complement
c. resistance to antibiotics
d. sequestering of organism within the endoplasmic reticulum
Answer: d. sequestering of organism within the endoplasmic reticulum
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In a survey of Dall mountain sheep in Denali National Park in Alaska, researchers found that wolves preyed primarily on the most vulnerable members of the population, the young and the old. What conclusion is best supported by this data?
A. A limited program should be established to cull the sheep population. B. Wolf predation would not be expected to dramatically reduce the sheep population. C. The wolf population is at its carrying capacity, so it is no threat to the sheep population. D. A limited program should be established to cull the wolf population. E. Dall mountain sheep in Denali are an r-selected population.
As a general principle of gene regulation through operons, regulatory genes encode
A) trans-acting proteins that interact with cis-acting DNA elements. B) cis-acting proteins that interact with cis-acting DNA elements. C) cis-acting proteins that interact with trans-acting DNA elements. D) trans-acting proteins that interact with trans-acting DNA elements.
How is gel electrophoresis used to demonstrate the molecular basis of SCD?
A) by revealing that the protein products of the ?A and ?S alleles have distinctive electrophoretic band patterns B) by revealing variations in the length of a DNA restriction fragment that distinguishes the ?A and ?S alleles C) by revealing variations in the exon splicing of the mRNA products of the ?A and ?S alleles D) by revealing variations in the electrophoretic mobility of proteins and the restriction fragment length polymorphisms of DNA (both A and B) E) by revealing variations in the electrophoretic mobility of proteins, the restriction fragment length polymorphisms of DNA, and the splice variants of the mRNA (A, B, and C)
Albinism, lack of pigmentation in humans, results from an autosomal recessive gene. Two parents with normal pigmentation have an albino child. What is the probability that their next child will be albino?
A) 1/3 B) 1/2 C) 1/16 D) 1/4 E) 3/4