What is the basis for inferring infection of a pathogen when a serological EIA is performed? In this context, what does a positive result indicate?
What will be an ideal response?
Answer: An EIA can measure the titer of a specific antibody using a probe specific to the antibody of interest. A patient's serum should contain antibodies produced by the immune system if they were exposed to a particular pathogen or are currently infected by the pathogen. A positive result on this type of test suggests either situation is probable.
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Which of the following illustrate(s) ventilation?
a. bailing water over the gills b. movement of water past cells by using flagella c. moving air in and out of lungs d. tracheal exchanges e. all of these
The binding of nonsister chromatids by a synaptonemal complex draws the homologs into close contact so that what process can occur?
A) cytokinesis B) karyokinesis C) independent assortment D) synapsis E) disjunction
Which statement about biological clocks is FALSE?
a. They are limited to vertebrates. b. They are regulated by clock proteins that act both within and outside the nervous system. c. They have complex feedback loops. d. They are controlled by genes. e. They are capable of sustaining biological rhythms independently of environmental cues.
Electron microscopes have an advantage over light microscopes because
a. electron microscopes allow the viewer to examine living cells. b. electron microscopes have a larger objective aperture. c. electron microscopes are easier to use. d. the wavelength of electrons is shorter than that of light.