A male patient at a medical clinic presents with infertility due to nonmotile sperm and an inability to clear mucous from his respiratory tract. Other tissues are normal. You suspect that these symptoms may be caused by mutant
a. tubulin.
b. kinesin.
c. dynein.
d. tau protein.
e. MAP 1.
Ans: c. dynein.
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The function of nectar is
A. provision of carbohydrates for the plant. B. attraction of pollinators. C. preservation of delicate flower parts. D. a sticky trap for parasitic insects. E. prevention of desiccation.
Serotyping of bacteria cannot be used to identify which component?
A. Cell wall B. Flagella C. DNA D. Capsule
The organism in the above figure would have
a. complex vascular systems. b. complex excretory systems to withstand marine water. c. few vascular systems because the cells are near the surface. d. thick cuticles to withstand dehydration. e. none of these.
The ________ effect refers to the rich diversity of life that occurs along the border between adjacent habitat patches, represented by species from both adjacent patches and species adapted to edge habitats
Fill in the blank(s) with correct word