The cardiac, pyloric, anal, and ileocecal sphincters are all part of the
(a) digestive tract.
(b) respiratory tract.
(c) circulatory system.
(d) muscular system.
(a) digestive tract.
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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.
Describe antagonistic muscles. How do muscles work as levers? Define origin and insertion
What will be an ideal response?
Chlamydomonas, although a green algae, is sensitive to an antibiotic, erythromycin
If mt– mating-type alga that is sensitive is mated with an mt+ cell that is resistant, and if the mt+ strain donates chloroplasts, what results do you expect and why? A) All progeny are sensitive because sensitivity is the dominant trait. B) Approximately half the progeny are sensitive because this is the recessive trait. C) All the progeny are sensitive because this is the recessive trait. D) All progeny are resistant because cpDNA is responsible. E) Approximately half the progeny are sensitive because cpDNA is responsible.
The lectin pathway for complement action is initiated by
A) mannose on host membranes. B) mannose on the surface of microbes. C) lectins of the microbe. D) gram-negative cell walls. E) gram-positive cell walls.