What is the most fundamental difference between the innate immune system and the adaptive immune system?
A. The way in which pathogens are recognized
B. The types of cells that participate in each response
C. The way in which pathogens are destroyed
D. The speed
Answer: A
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Beadle and Tatum discovered that metabolic pathways are studied most effectively using which of the following techniques?
A) creating multiple gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway B) adding intermediates to a metabolic pathway C) removing all intermediates of a metabolic pathway D) creating single gene mutations resulting in nonfunctional enzymes specific to a metabolic pathway
Respond to the following statements with reference to the five components of respiratory systems listed below. Answers may be used more than once or not at all.
A. Air moves from the nasal cavity into this passageway. B. Another name for voice box. C. D. CO2 moves from the alveoli to this component during exhalation. E. This is the last component of the human lung that air flows into. F. Gas exchange between the air in the lungs and the blood circulatory system occurs here.
Which of the following is true of Agrobacterium tumefaciens?
A. It can enter plants through unbroken leaf tissue B. It causes crown gall disease when it carries a tumor inducing (Ti) plasmid C. It is capable of nitrogen fixation D. All of the choices are correct.
Which of the following human genetic disorders is caused by a dominant allele?
a. hemophilia b. sickle cell anemia c. cystic fibrosis d. Huntington's disease