The apparatus in the figure was used by Stanley Miller and Harold Urey to study the origin of life on Earth. What compound was excluded from the apparatus so that it would form a reducing atmosphere?
A. CO2
B. O2
C. NH3
D. H2
E. H2O
B. O2
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Is it possible to be a "carrier" (phenotypically normal but capable of passing the allele to one's offspring) for Tay-Sachs Disease?
a. Yes b. No
A red chemical dye known as phenol red changes to yellow when CO2 is present. A small green plant seedling is placed in phenol red and then placed in the dark. Which of the following is most likely to occur?
a. The solution is yellow to begin with, and it will turn red because photosynthesis is occurring. b. The solution is red to begin with, and it will turn yellow because photosynthesis is occurring. c. The solution is yellow to begin with, and it will turn red because respiration is occurring. d. The solution is red to begin with, and it will turn yellow because respiration is occurring. e. The solution is red to begin with, and it stays red as photosynthesis cannot occur in the dark.
The tissue lining the mouth, organs of the digestive system, and inner surfaces of the lungs is classified as
A) connective. B) epithelial. C) nervous. D) muscle. E) connective and nervous.
Stromatolites are rocklike columns composed of:
a. protists b. dinoflagellates c. microbial biofilms d. heterotrophic organisms e. photosynthetic eukaryotes