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DP IB Biology: SL

Topic Questions

Home / IB / Biology: SL / DP / Topic Questions / 6. Human Physiology / 6.3 Defence Against Infectious Disease / Multiple Choice: Paper 1


6.3 Defence Against Infectious Disease

Question 1

Marks: 1

Which component of blood has a role in preventing pathogens from entering the body?

  • Red blood cells

  • Blood plasma

  • Platelets

  • White blood cells

Choose your answer
  

Question 2

Marks: 1

What is the principle purpose of sebum secretions onto the surface of the skin?

  • To prevent microorganisms from sticking to the skin.

  • To lower skin pH, which slows down the growth rate of microorganisms.

  • To provide a surface texture to the skin that aids the evaporation of sweat. 

  • To assist in the formation of blood clots as a way of sealing wounds after a cut or graze. 

Choose your answer
  
Key Concepts
Skin

Question 3

Marks: 1

This question is about the proteins involved in blood clotting. 

Which shows the 3 boxes on the left joined to the appropriate one on the right?

fibrin-mcq

  • E4Y3ewux_e-3a

  • vaLVpSxr_e-3b

  • Fw4r7nNz_e-3c

  • x~nGGbA3_e-3d

Choose your answer
  

Question 4

Marks: 1

Which phrase best fits into the gap in the following sentence?

The shape of antibody molecules gives each one a particular 3-D configuration. This allows each antibody to be ______________ each individual pathogen. 
  • ...well suited to...

  • ...specific to...

  • ...functional against...

  • ...the same shape as...

Choose your answer
  
Key Concepts
Antibody Production

Question 5

Marks: 1

Which pair of scientists carried out research work that built upon the discovery of antibiotics by Alexander Fleming in 1929?

  • Darwin and Wallace

  • Crick and Watson

  • Meselson and Stahl

  • Florey and Chain

Choose your answer
  
Key Concepts
Antibiotics