A nonsegmented worm is found during a routine colonoscopy of an individual who reported having abdominal cramps, nausea, and vomiting. This worm is likely which of the following?
A. nematode
?B. fluke
?C. trematode
??D. annelid
Ans: A. nematode
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Answer the following statements true (T) or false (F)
1. Thermoreceptors are only located in the skin on the outside of the body. 2. Processing of visual information occurs within the eye itself and before action potentials are sent via the optic nerve to the visual cortex. 3. Rods and cones make direct contact with ganglion cells within the vertebrate retina. 4. Rods and cones, like most sensory receptors, depolarize on receiving a stimulus. 5. Our senses of taste and smell are enhanced when we are hungry.
An example of an inorganic molecule is
A. CaCl2. B. C2H6. C. C2H5OH. D. C3H5(OH)3.
What do scientists consider when they perform a cladistic analysis?
a. only the DNA of organisms b. all traits of organisms c. derived characters d. only physical similarities
Organisms come into sexual maturity at different times of the year. This is an example of:
A) temporal isolation. B) hybrid infertility. C) hybrid inviability. D) hybrid vigor.