All of the following are true about archaea except
A) They are prokaryotes.
B) They lack peptidoglycan in their cell walls.
C) Some are hyperthermophiles, some are extreme halophiles others are methanogens.
D) They evolved before bacteria.
E) Some produce methane from carbon dioxide and hydrogen.
Ans: D) They evolved before bacteria.
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Bacteriophages and animal viruses
A. both may enter a host cell by endocytosis. B. both may enter a host cell by fusion. C. both involve entry of the entire nucleocapsid. D. differ because bacteriophages leave the capsid outside the cell, while animal virus entry involves the entry of the whole nucleocapsid.
Precipitation on a tropical island is greatest during June to August and lowest during January to April. This island must be located south of the equator
Indicate whether the statement is true or false
The tick-rhino relationship is an example of ________
A) parasitism B) mutualism C) predator-prey D) commensalism
The radioisotope 14C can be used as a research tracer because it ____.
A. decays to 12C B. has a different number of protons than 12C C. has fewer neutrons than 12C D. behaves the same chemically as 12C E. has six carbons and six neutrons