Functional secondary xylem that conducts water and dissolved minerals is known as:
a. softwood.
b. springwood.
c. hardwood.
d. sapwood.
e. heartwood
d
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Features associated with the leaf epidermis are:
A. guard cells B. trichomes C. cuticular wax D. pores E. All of the choices are correct
Mebendazole, thiabendazole, and ivermectin are drugs used to treat ________ infections.
A. protozoan B. viral C. fungal D. bacterial E. helminthic
Color vision depends on dominant alleles of three different genes: the R gene and the G gene, both on the X chromosome, and the B gene, which is autosomal. Recessive mutant alleles of any one of these three genes can cause color blindness in homozygotes. Suppose a color-blind man marries a color-blind woman and all their offspring have normal vision. What is the genotype of the woman?
A) RR GG bb B) RR gg BB C) rr GG bb D) RR gg BB or RR GG bb E) rr GG bb or rr gg BB
The biosphere
a. is located in the Northern Hemisphere. b. contains organisms with similar needs. c. has environmental conditions of similar temperature, pressure, and salinity. d. supports all of life on earth. e. is restricted to the continents.