Author Question: What substances in segmented neutrophils are important for intracellular killing of bacteria? a. ... (Read 71 times)

viki

  • Hero Member
  • *****
  • Posts: 525
What substances in segmented neutrophils are important for intracellular killing of bacteria?
 
  a. Alkaline phosphatase and halides
  b. Myeloperoxidase and superoxide
  c. Collagenase and hydrogen peroxide
  d. Acid phosphatase and anions

Question 2

CD34 is an antigen found on which one of the following cells?
 
  a. Myeloblast
  b. Segmented neutrophil
  c. Eosinophil
  d. Lymphocyte



cici

  • Sr. Member
  • ****
  • Posts: 325
Answer to Question 1

ANS: B
Bacteria killing is a complex mechanism, requiring activation of the neutrophil, ingestion of the bacterium, and incorporation into a phagosome. Cytoplasmic granules fuse with the lysosome and dump their contents. Myeloperoxidase, halides, hydrogen peroxide, and the formation of superoxide and oxygen radicals are all instrumental for killing. Also critical for killing is activation of proteinases such as cathepsin G.

Answer to Question 2

ANS: A
CD34 is found on the myeloblast and also the promyelocyte, but it is downregulated as the cell continues to mature and is not found on mature cells of any lineage.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

Did you know?

Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

Did you know?

Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

Did you know?

Approximately 25% of all reported medication errors result from some kind of name confusion.

For a complete list of videos, visit our video library