The ________ involves proteins in the plasma that are activated when bacteria or fungi are present. These puncture holes in the cell walls of invaders.
A. complement system
B. inflammatory response
C. macrophagic defense system
D. natural killer cell
Answer: A
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Which of the following amino acids is not one of the 20 common amino acids found in cells?
A) leucine B) isoleucine C) glutamine D) proline E) pyrrolysine
Which of the following is not a problem of deforestation?
1.It will reduce the future production of fossil fuels. 2.It reduces primary productivity by eliminating photosynthesizers. 3.It increases global warming by increasing radiation reflection. 4.It increases global warming through carbon dioxide liberation.
Transcription converts the information stored in _________ to ____________.
a) RNA .... a protein b) a protein..... DNA c) DNA...... A protein d) DNA...... RNA
The respiratory center is directly sensitive to the levels of H+. Could one correctly say that CO2 levels control the breathing rate? Explain your answer.
What will be an ideal response?