When the air in a testing chamber is specially mixed so that its oxygen content is 10 percent and its overall air pressure is 400 mm Hg, then is _____
A) 400 mm Hg
B) 82 mm Hg
C) 40 mm Hg
D) 21 mm Hg
E) 4 mm Hg
Answer: C
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Adjacent animal cells utilize ____ to rapidly communicate with each other
a. gap junctions b. plasmodesmata c. hormones d. desmosomes e. neurotransmitters
In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls
flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with white flowers crossed with a dwarf plant with purple flowers produces all tall offspring with purple flowers. What is the genotype of the parents? What will be an ideal response?
During the first emergence of life, the atmosphere was ____.
A. high in oxygen, high in carbon dioxide B. high in hydrogen, low in oxygen C. changing from anaerobic to aerobic D. aerobic E. high in oxygen, low in carbon dioxide
Normal flora may be found in all of the following environments except
A. The vagina B. The pharynx C. The axilla D. The upper respiratory tract E. The blood