A microbiologist is conducting a research project on chemolithoautotrophs. This means that the investigator is examining certain aspects of a bacterium that
A. is a purple nonsulfur bacteria which depends on light.
B. can oxidize inorganic molecules such as ammonia and sulfur for energy.
C. can use the energy from sunlight to build organic molecules from carbon dioxide.
D. uses light as its energy source and carbon for organic compounds.
E. obtains carbon from organic molecules.
Answer: B
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During the first 5–600 million years on Earth, temperatures ranged from 500–1000°C, atmospheric pressure was 10 times current levels, and the planet was bombarded with meteorites. How would these conditions favor the formation of biological molecules?
A. Many chemical reactions are inhibited by high temperature and pressure. B. High temperature and pressure are the best conditions for enzyme function, needed to support life. C. Oxygen will break down many organic molecules by reduction. D. Oxygen in this high temperature and pressure atmosphere would have been chemically less reactive. E. Water and meteorite dust would have provided the chemical reactions necessary for formation of biological molecules.
Four of the five structures listed below are
components of the human respiratory system. Select the exception. a. thoracic cavity b. pleural sac c. diaphragm d. book lungs e. larynx
Which of the following dermatophytes infects hair as well as skin?
A) Microsporum canis B) Malassezia furfur C) Fonsecaea pedrosoi D) Epidermophyton floccosum E) Trichophyton rubrum
Identify the following reaction: HCl + NaHCO3 ? NaCl + H2CO3
A) dehydration synthesis reaction B) hydrolysis reaction C) exchange reaction D) reversible reaction E) ionic reaction