Select all of the following that represent examples of taxis.
_____ In the Northern Hemisphere, Aquaspirillum bacteria burrow towards the magnetic north pole (the geographical south pole).
_____ Cyanobacteria filaments in an intertidal environment migrate upward if salinity falls below 15% and downward if it rises above 15%.
_____ Mammalian spermatozoa are guided toward an oocyte by a temperature gradient between the cooler sperm storage site and the fertilization site.
_____ Human body lice change direction more frequently as the temperature of their immediate environment increases.
__X__ In the Northern Hemisphere, Aquaspirillum bacteria burrow towards the magnetic north pole (the geographical south pole).
__X__ Cyanobacteria filaments in an intertidal environment migrate upward if salinity falls below 15% and downward if it rises above 15%.
__X__ Mammalian spermatozoa are guided toward an oocyte by a temperature gradient between the cooler sperm storage site and the fertilization site.
_____ Human body lice change direction more frequently as the temperature of their immediate environment increases.
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In clinical isolates, the most likely identification of coagulase-positive, catalase-positive, gram-positive cocci that are penicillin resistant would be:
a. S. aureus. b. S. intermedius. c. Stomatococcus luteus. d. Micrococcus aureus.
What is a possible disadvantage of using genetically modified crops?
A) The transgene may make its way into wild plants. B) Transgenic strains are typically less robust than the usual strains used for farming. C) The ability of transgenic plants to use nutrients is reduced so more fertilizer has to be applied. D) The ability of transgenic strains to use water is poor so these strains are not drought tolerant.
The second round of meiosis in the testes produces ____
a. primary spermatocytes b. secondary spermatocytes c. polar bodies d. spermatogonia e. spermatids
I think the proactive stance is a better attitude to promote than after-the-fact worrying! When planning a long week of sunbathing on the beach, What type of DNA damage should sunbathers be aware of before hitting the beach?
A. thymine dimers B. photolyase-induced mutations C. activation of uvr A, B, and C genes D. decreased telomere length