Which of the following statements is NOT true of protistan cysts?
A. Their consumption can lead to human health problems.
B. They facilitate the spread of pathogens from one host to another.
C. They may arise from sexual reproduction.
D. They may arise from asexual reproduction.
E. They attach to host cells by small hooks.
Answer: E
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Through the process of ____ , some bacteria or archaeons derive energy by combining NH4 + and NO2 - (recall the equation NH4 + + NO2 - N2 + 2H2O)
Fill in the blank with the appropriate word.
Integrase
A. is required for prophage formation. B. cuts viral genomes. C. is required for genome entry into the bacteria. D. is required for provirus formation. E. cuts the viral genome and is required for both prophage and provirus formation.
Turtles are thought to be living representatives of which of the following lineages?
a. anapsids b. archosaurs c. lepidosaurs d. synapsids e. diapsids
One hypothesis concerning the origin of the abiotic
synthesis of proteins holds that these proteins formed on and were bound and protected by a. oceanic stratified mica crystals. b. clay compounds in tidal flats. c. sediments in the oceans. d. oceanic metal ores. e. none of these.