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Author Question: An antigen is usually a _____. a. carbohydrate c. sugar b. protein d. amino ... (Read 132 times)

jessicacav

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on: Jul 21, 2018
An antigen is usually a _____.
 
  a. carbohydrate c. sugar
  b. protein d. amino acid

Question 2

Which of these is a protection against pathogenic invasion?
 
  a. low pH c. mucus films
  b. surfactant proteins in lungs d. all answers


strudel15

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Reply #1 on: Jul 21, 2018
Answer to Question 1

B

Answer to Question 2

D


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jessicacav

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Reply #2 on: Jul 21, 2018
Both answers were spot on, thank you once again


strudel15

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Reply #3 on: Jul 21, 2018
Great! Please up vote :D


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