RT-PCR (reverse transcription-polymerase chain reaction) can be used to compare gene expression levels during an organism's response to the environment. A scientist monitoring a tetracycline resistance gene will see what response in the expression when
the organism is challenged?
A) no change in gene expression
B) decreased gene expression
C) increased gene expression
Answer: C
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Which of the following is true of the human microbiome?
A) High blood sugar following weight-loss surgery is partly due to a changed gut microbiome. B) An altered microbiome hastens starvation in malnourished children. C) Antibiotics do not alter the gut microbiome. D) The microbiome consists primarily of cells that belong to the human body.
In the spring season, snakes have been observed moving onto warm roadways heated by the sunlight. This innate behavior of moving to a warmer area is a(n) behavior.
A. taxis B. reflex C. learned D. habituation E. fixed action pattern
Vincent Sarich and Allan Wilson estimated that humans diverged from their closest living primate relatives about 5 million years ago. What line of evidence did they use initially?
A) cladistic analysis of DNA sequences from living primates B) chromosomal banding patterns, fusions, and fissions C) radiometric dating of fossils D) DNA denaturation and re-annealing temperatures E) reactions between primate serum proteins and antibodies to human serum
Competition between species is called ________ competition.
A. interference B. interspecific C. intraspecific D. exploitative E. fundamental