If a person steps on a tack their somatic system will take over and produce a reflex action. A reflex action
A. has no protective value.
B. does not require the central nervous system.
C. is an automatic, involuntary response.
D. is normally controlled consciously.
E. is only found in humans.
Answer: C
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The double-pored tapeworm, Diphyllobothrium caninum, consisting of many small proglottids, measures 10 to 70 cm in length as an adult. The scolex contains four suckers and an armed ros-tellum. The intermediate host in which infective cysticercoids develop is the:
a. dog. b. cat. c. flea. d. human.
Mebendazole, thiabendazole, and ivermectin are drugs used to treat ________ infections.
A. protozoan B. viral C. fungal D. bacterial E. helminthic
Which phenotypes are parental?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) wild-type and orange
B) brown and bright-red
C) wild-type and brown
D) bright-red and orange
E) There is no way to determine this.
When subtropical forest is cleared, what biome is most likely to replace it?
a. grassland suitable for grazing b. cropland ideal for agriculture c. young forest with the same species d. desert with poor eroded soil e. chaparral with grass and low bushes