Bromthymol blue turns yellow in the presence of carbon dioxide. This characteristic makes it possible for bromthymol blue to function as
a. a measure of volume
b. an indicator
c. a catalyst
d. an energy source
Answer: b. an indicator
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____ allow oxygen to diffuse through the outer bark of woody plants to supply the respiratory needs of the underlying cells
Fill in the blank with the appropriate word.
What is the most abundant protein in the human body?
a. polysaccharides b. elastin
c. collagen d. amino acid e. triglycerides
The persistence of the sickle-cell anemia allele in the
African population is the result of a. a high rate of mutation of the normal allele to the sickle-cell anemia allele. b. the advantage of the heterozygous form over the homozygous forms. c. nonrandom mating. d. a decline in the occurrence of malaria in Africa. e. genetic drift.
The outer cell layer of the blastocyst becomes the ________, which forms the embryonic portion of the placenta
A) chorion B) inner cell mass C) primitive streak D) yolk sac E) embryonic disk