You are investigating a clinical disorder in one of your patients. You discover that the patient has an autoimmune disease that targets and destroys fibroblasts. This disorder would most likely affect

A) fiber production by the cells, as occurs with blood clotting.
B) annulus formation.
C) hyluronate production in the joints.
D) collagen production.
E) all of the above


D) collagen production.

Biology & Microbiology

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Consider a mutant organism that is unable to make the amino acid arginine. Knowing that the

metabolic pathway to production of arginine is ornithine ? citrulline ? arginosuccinate ? arginine, you test the ability of the mutant to grow in the presence of each one of these compounds, providing just one of the compounds in each of your tests. You find that the mutant can grow in the presence of arginosuccinate or arginine, but not in the presence of citrulline or ornithine. From this you can conclude that the product of the gene mutated in the mutant is most directly involved in production of ____.

a. arginine from ornithine b. arginosuccinate from citrulline c. citrulline from ornithine d. arginine from arginosuccinate e. arginosuccinate from ornithine

Biology & Microbiology

The application of recombinant DNA technology to forensic cases requires all of the following

EXCEPT A. cloning of the DNA. B. establishment of DNA profiles. C. DNA sequencing. D. STR analysis. E. none of these.

Biology & Microbiology

Polychaetes crawl by means of leg-like ________ which also serve in respiration.

a. Aortic arches b. Metanephridia c. Clitella d. Palps e. Parapodia

Biology & Microbiology

Which of the following conditions have been conclusively proven to be linked to childhood vaccinations?

A. autism B. asthma C. diabetes D. All of these choices are correct.

Biology & Microbiology