The gene that governs a cell's ability to synthesize methionine from inorganic precursors is labeled “met”. The designation met- indicates the ____.
a. normal allele
b. mutant allele
c. bacterium is biologically active
d. bacterium is biologically inactive
e. bacterium can make its own methionine
ANSWER: b
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Stromatolites are of particular interest to researchers as they can provide a record of microbial sediment deposits over the last 3.5 billion years of Earth's history
A. true B. false
How do we know that hominids did not have
splayed-out big toes? a. Mary Leakey found footprints fossilized from soft volcanic ash. b. Some of the great apes have lost their splayed toe features. c. Complete fossils of these early hominids have been discovered. d. Examples of these hominids exist in New Guinea. e. None of these are correct.
People who have been infected with cholera bacteria but have no symptoms may still infect others
This is done by a. sneezing on another individual. b. coughing on another individual. c. kissing another individual. d. blood transfusions. e. passing feces into unsanitary water supplies.
Walking or running are more energetically expensive forms of locomotion than either swimming or flying.
Answer the following statement true (T) or false (F)