8: Detection of Bio-Organic Molecules

Students perform chemical indicator tests (Benedict's, Biuret, iodine, Sudan IV) to identify sugars, proteins, starch, and lipids in unknown samples.

Blood Types from Agglutination Test Results

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During a blood typing test, anti-A, anti-B, and anti-D antibodies are added to a blood sample along with a control. A visible reaction indicates the presence or absence of the corresponding antigens.
What would the test results look like for someone with O- blood type?

• A.

  ⬮		⬮		● . ● . . ● . ● ● . ● .		● . ● . . ● . ● ● . ● .
  A antigen		B antigen		D antigen		control

  Visual representation of test reactions: OO%%

• B.

  ⬮		⬮		⬮		⬮
  A antigen		B antigen		D antigen		control

  Visual representation of test reactions: OOOO

• C.

  ⬮		⬮		⬮		● . ● . . ● . ● ● . ● .
  A antigen		B antigen		D antigen		control

  Visual representation of test reactions: OOO%

• D.

  ● . ● . . ● . ● ● . ● .		● . ● . . ● . ● ● . ● .		● . ● . . ● . ● ● . ● .		⬮
  A antigen		B antigen		D antigen		control

  Visual representation of test reactions: %%%O

• E.

  ● . ● . . ● . ● ● . ● .		● . ● . . ● . ● ● . ● .		● . ● . . ● . ● ● . ● .		● . ● . . ● . ● ● . ● .
  A antigen		B antigen		D antigen		control

  Visual representation of test reactions: %%%%

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