Nitrogen-fixing bacteria convert ____ to ____
a. gaseous nitrogen; ammonia
b. ammonia; gaseous nitrogen
c. gaseous nitrogen; nitrates
d. gaseous nitrogen; nitrites
e. ammonia; nitrates
A
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Which of the following statements is TRUE?
A) Fimbriae are generally shorter and more numerous than flagella. B) Fimbriae enable cells to stick to surfaces. C) Pili serve as receptors and facilitate genetic exchange between prokaryotic cells. D) Fibriae are usually shorter than flagella and enable cells to adhere to surfaces, whereas pili are involved in genetic exchange.
Moving the bone away from the midline
Four of the five answers listed below are characteristic reactions of the complement system to
invaders. Select the exception. a. causes an amplifying cascade of reactions to invaders b. triggers the secretion of histamines c. causes invading cells to lyse d. enhances the recognition of invaders by phagocytes e. creates gradients that attract phagocytes
On a remote island, a new animal is found. It has a four-chambered heart and lungs and is endothermic. It has internal fertilization, lays shelled eggs, and nurses its young after they hatch. This animal is most likely a(n)
A) monotreme. B) reptile. C) amphibian. D) coelacanth. E) marsupial.