In fish, countercurrent exchange involves water flowing over gills and blood flowing through gill capillaries in opposite directions. This increases gas exchange by creating a(n):
a. larger surface area
b. osmotic gradient
c. concentration gradient
d. reservoir for gas
e. source of new hemoglobin
c
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The best place to find gibberellins in a plant would be in the:
A. apical buds B. roots C. young leaves D. seed embryos E. All of these are correct
Which process generally is the cause for production of recombinant offspring for two genes on the same chromosome?
a. movement of transposable elements b. pairing of nonhomologous chromosomes c. gene duplication d. exon shuffling e. crossing over between homologous chromosomes
what is an example of wheal and flare?
What will be an ideal response?
What are the three factors of the epidemiological triangle?
A) vaccine use, disinfectant use, and hand-washing policy B) time from exposure to symptoms, access to transportation, quality of hospitals C) pathogen type, host health, and geographic overlap D) environmental factors, etiological agent, and host factors E) survivability, length of acute phase, cultural factors