The third line of defense against foreign invaders is ____
a. adaptive immunity
b. innate immunity
c. secretions
d. physical and chemical barriers
e. inflammation
ANSWER: a
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In correct order, the three stages of translation are
a. initiation, replication, and termination. b. elongation, peptide bond formation, and codon-anticodon pairing. c. initiation, chain elongation, and termination. d. termination, initiation, and replication. e. initiation, codon-anticodon pairing, and termination.
What is the hygiene hypothesis?
A. People who have more exposure to infectious agents will have an overactive immune system. B. People who have less exposure to infectious agents will have an overactive immune system. C. People who have better hygiene and are cleaner will have a weaker immune system. D. People who have better hygiene and are cleaner will have more infections. E. People who have better hygiene and are cleaner will have fewer infections.
What is the purpose of the Calvin cycle?
a. to recover electrons lost when water was split b. to counteract increasing atmospheric CO2 concentrations (global warming) c. to capture photons of light d. to produce sugars using CO2 as a carbon source
The archenteron of a frog develops into the _____
A) blastocoel B) endoderm C) placenta D) lumen of the digestive tract