TRUE OR FALSE (each sentence) 1. t/f Macrophages and dendritic cells can both be antigen-presenting cells.

2. t/f Complement proteins are antibodies produced by skin cells.

3. t/f Dendritic cells are the histamine-producing cells of the immune system.

4. t/f Stomach acid is one of our natural defenses against bacteria in food.

5. t/f Cytokines are molecules that cut holes in bacterial membranes.

6. t/f There are different Toll-Like Receptors for bacteria and viruses.

creative diagnostics provides a protocol for total protein extraction based on ripa which is widely used.

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explanation:

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the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands