Type the number

Exercise and reference answers

Questions

1. Answer

   1981

   Question

   Year AIDS was first reported

2. Answer

   4

   Question

   Peptide chains in one antibody molecule

3. Answer

   2

   Question

   Hosts the malarial parasite needs

4. Answer

   50

   Question

   Per cent of lymphoid tissue that is MALT

5. Answer

   4

   Question

   Barriers in innate immunity

6. Answer

   12

   Question

   Adolescence begins at age, in years

Instructions

Type the number only.

Explanation