Answer the following questions true (T) or false (F)
1. People in the asymptomatic incubation stage of a disease may be a reservoir of the agent.
2. Koch's postulates can be applied to every infectious disease to identify its causative pathogen.
3. All infections result in disease.
1. TRUE
2. FALSE
3. FALSE
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Which of the following things result from symbiotic relationships between bacteria and eukaryotes? (Select all correct choices.)
A. bioluminescence in the bobtail squid B. amino acid synthesis in aphids C. cellulose breakdown in the human gut D. vitamin production in the human gut
Hormones are typically involved in maintaining ____ , or a given steady state for a particular factor (like sugar or calcium levels in the blood)
Fill in the blank with the appropriate word.
"DNA footprinting" is a technique that can be used to identify:
A. a region of DNA that has been damaged by mutation. B. the position of a particular gene of a chromosome. C. the position of internally double-stranded regions in a single-stranded DNA molecule. D. the specific binding site of a repressor, polymerase, or other protein on the DNA. E. All of the choices given can be identified by this technique.
Standing still and at attention for long periods can result in inadequate venous return. The effects of this can be seen when even young and healthy soldiers sometimes faint when standing at attention for long periods. Which of the following is NOT occurring to promote return of blood from the venous system in this situation?
A. sympathetic activation of smooth muscle in large veins B. skeletal muscle activity compressing veins and forcing blood flow C. one way flow in the venous system due to valves D. ventricular contraction E. None of the choices for this question are correct.