The respiratory pacemaker is located in the _____
a. lungs
b. cerebral cortex
c. brain stem
d. bronchioles
e. alveoli
ANSWER: c
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Which of the following lineages contains all of the rest of the lineages in the list?
a. Gnathostomata b. Vertebrata c. Amniota d. Tetrapoda e. Myxinoidea
During transcription,
a. non-coding sequences are removed from the RNA transcript. b. regulatory proteins attach to the DNA at the promotor site. c. DNA polymerase assembles RNA nucleotides. d. the entire DNA strand opens up for complete gene transcription. e. tRNA brings nucleotides to the DNA strand.
Extracts of pathogenic bacteria can transform
harmless bacteria to harmful bacteria unless __________ enzymes are added to the extract. a. protein-digesting b. mRNA-digesting c. tRNA-digesting d. DNA-digesting e. any of these
What are leukocidins?
A) Molecules that are capable of destroying phagocytes B) Molecules that can degrade IgA C) Molecules that destroy the complement proteins