Compare the presence or absence of the four chordate characteristics in adult sea squirts and lancelets.
What will be an ideal response?
Adult sea squirts do not have a notochord or postanal tail. A nerve ganglion develops in the adult. The number of pharyngeal gill slits increases in the adult sea squirt. The adult lancelets have a notochord present, a dorsal nerve cord, apostanal tail, and pharyngeal gill slits.
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According to the logistic growth equation, = rmaxN,
A) the number of individuals added per unit time is greatest when N is close to zero. B) the per capita growth rate (r) increases as N approaches K. C) population growth is zero when N equals K. D) the population grows exponentially when K is small. E) the birth rate (b) approaches zero as N approaches K.
The inflammatory cytokines IL-1, IL-6, and TNF-? are also
A) opsonizing agents that coat foreign cells. B) activating cytokines that stimulate Th1 cells to replicate. C) capable of producing systemic fever by stimulating the release of prostaglandins in the brain. D) part of the complement system that results in the destruction of foreign cells.
Which group of animals are living representatives of the theropods, a lineage of bipedal predatory dinosaurs?
a. birds b. crocodiles and alligators c. snakes and lizards d. turtles e. mammals
Which of the follwoing is NOT true of sebaceous glands?
a. They secrete oil. b. They are found in the skin. c. They release entire cells with the secretion. d. They are exocrine glands. e. They produce hormones