Forensic technicians unearth a skeleton from a shallow grave. They extract a tiny amount of DNA from the pulp found in the teeth. How could they obtain sufficient DNA for an analysis of the victim's genes?
A. Subject the DNA to gel electrophoresis.
B. Use a nucleic acid probe.
C. Subject the specimen to amniocentesis.
D. Use the polymerase chain reaction.
E. Subject the DNA to restriction enzymes.
D
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How does the adaptive immune system differ from the innate immune system?
A. in the ability to distinguish self from nonself B. in having memory C. in the ability to target a specific pathogen D. both in having memory and in the ability to target a specific pathogen
In Gram-stained preparations, M. atlantae will appear as:
a. either gram-negative coccobacilli or short, broad rods that tend to resist decoloriza-tion and may appear gram-variable. b. gram-negative cocci in pairs or short chains. c. coccobacilli or medium-sized rods. d. coccobacilli that may appear in chains.
What are the properties of DNA probes?
I. They are labeled with a radioactive tracer. II. They are short chains of nucleotides. III. They match the targeted DNA sequence.
a. I and II b. II and III c. I only d. I, II, and III e. III only
A group of patients was seen on an emergency basis complaining of abdominal craps and watery diarrhea within 5 hours of attending a picnic in which ham, potato salad, and custard-filled pastries were on the menu. Which of the following is the likely cause of this disease?
A. Attachment and disruption of intestinal lining due to parasitic infection B. Bacterial colonization and toxin production C. Bacterial adherence and invasion D. Performed bacterial toxin E. Replication of virus that prevents reabsorption of water