What is one concern with the use of genetically-engineered, herbicide-tolerant crops?
a. decreased yields
b. potential allergic reactions
c. transfer of herbicide resistance to weeds
d. loss of genetic diversity
e. expense of using herbicides
c
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Which of the following statements about chytrids and basidiomycetes is incorrect?
A. Chytrids have a well-developed mycelium, whereas basidiomycetes have a welldeveloped fruiting body. B. Chytrids are aquatic, whereas basidiomycetes are terrestrial. C. Chytrids have flagellated spores, whereas basidiomycetes do not. D. Chytrids lack well-defined hyphae, whereas basidiomycetes have well-defined hyphae. E. Chytrids lack a heterokaryotic phase, whereas basidomycetes have a heterokaryotic phase.
Menstrual flow results in the discharge of ____
a. the follicle b. the corpus luteum c. the lining of the endometrium d. surface cells from the vagina e. blood from vessels on the outer side of the uterus
In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over
spotted (s). If a red, spotted male was crossed with a black, solid female and all the offspring from several crosses expressed only the dominant traits, the genotype of the female would be a. BB SS. b. Bb SS. c. Bb Ss. d. BB Ss. e. none of these.
The chemical mediators of anaphylaxis are
A) found in basophils and mast cells. B) antibodies. C) antigens. D) antigen-antibody complexes. E) the proteins of the complement system.