A preparation that "teaches" the immune system to recognize a disease-causing agent without actually causing disease is termed a(n)
A. antibiotic.
B. virus.
C. antiviral.
D. vaccination.
E. injection.
Answer: D. vaccination.
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Methane is an important greenhouse gas whose levels in the atmosphere are also rising. This is because:
A. methane is generated by archaeons living in the guts of cattle, and beef production is increasing. B. methane is generated by archaeons living in waterlogged rice paddies, and rice production is increasing. C. methane is released when permafrost at high latitudes melts, and more permafrost is melting. D. methane is generated by archaeons living in the guts of cattle and in rice paddies, and both beef and rice production are increasing. E. All of the above.
What enzyme catalyzes the attachment of amino acids to tRNA molecules?
A. helicase B. topoisomerase C. aminoacyl-tRNA synthetase D. ribosome E. translation factor
Which of the following sub-disciplines of
biology focuses on understanding the entire genetic composition of organisms?
a. evolutionary biology b. molecular biology c. genomics d. comparative anatomy e. embryology
Which of the following is NOT a contributing
factor in species extinction? a. habitat loss b. overharvesting c. habitat fragmentation d. conservation biology e. illegal wildlife trading