Uncontaminated rain water has a pH of 5.6 (slightly acidic) because
A. oxides of sulfur are always present in the atmosphere, even from natural sources.
B. upon condensation, water chemically reacts with carbon dioxide forming a weak carbonic acid.
C. most water vapor originates by evaporation from the oceans and sea water is acidic.
D. droplets of water necessarily condense on atmospheric particulate.
Answer: B
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The system responsible for defense against disease and harmful substances is the
A. circulatory system. B. endocrine system. C. immune system. D. excretory system. E. reproductive system.
Raindrops fall because:
A) they are large compared to atmospheric molecules. B) they are small compared to atmospheric molecules. C) they become large enough that gravity can pull them out of the sky. D) they roll down isentropic surfaces and can't be stopped.
Which of the following is a protein associated the storage of iron?
A) actin B) ferritin C) hemoglobin D) insulin
Aspartate transaminase belongs to which group of enzymes?
A) hydrolases B) lyases C) oxidoreductases D) transferases