Garstang's theory states that the vertebrates originated from:
A. larval tunicates that developed the ability to reproduce sexually while retaining the larval body form
B. a gradual modification of the adult body form of Urochordates
C. larval Cephalochordates that developed the ability to reproduce sexually while retaining the larval body form
D. echinoderms with a post anal tail and notochord
E. segmented echinoderms
A. larval tunicates that developed the ability to reproduce sexually while retaining the larval body form
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In transcription, _____ is used as a template for the construction of a new RNA molecule
a. the entire DNA molecule b. both strands of a double-stranded segment of DNA c. a segment of one strand of double-stranded DNA d. an entire RNA molecule e. a single-stranded segment of RNA
"Perception" differs from "sensation" when
referring to a stimulus in a. the type of receptor stimulated. b. understanding the significance of the stimulus. c. the number of receptors that depolarize. d. feeling exactly what is happening at the site. e. responding to the stimulus
The ________ are a group within the Euglenozoa that have a unique, single mitochondrion.
Fill in the blank(s) with the appropriate word(s).
Trichloroethylene (TCE) is toxic to humans because it
A. contains heavy metals. B. causes a decrease in the yield of crop plants. C. prevents CO2 production by plants. D. depletes nitrogen from soils. E. is carcinogenic.