Proteins may act as buffers because the free carboxyl group can release hydrogen ions.
a) the free carboxyl group can combine with hydrogen ions.
b) the free carboxyl group can act as a base.
c) the free amino group can release hydrogen ions.
d) the free amino group can act as an acid.

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7. describe two strategies that parents can use to cope with stress. 8. describe the three types of childcare available to families. 9. what can parents do to be more involved in their children's education at home and at school? 10. which factors should a parent consider when choosing a childcare option?