What is the probable sequence in which the following clades of animals originated, from earliest to most recent?

1. tetrapods

2. vertebrates

3. deuterostomes

4. amniotes

5. bilaterians

TLS Online TPP Program

#Question id: 1636

#Unit 4. Cell Communication and Cell Signaling

Edward Jenner vaccinated against smallpox using:

TLS Online TPP Program

#Question id: 1637

#Unit 4. Cell Communication and Cell Signaling

Protective antibodies against infectious agents are often:

TLS Online TPP Program

#Question id: 1638

#Unit 4. Cell Communication and Cell Signaling

Intracellular parasites within macrophages are killed more readily in the presence of:

TLS Online TPP Program

#Question id: 1639

#Unit 4. Cell Communication and Cell Signaling

T-cell surface receptors for antigen partly recognize:

TLS Online TPP Program

#Question id: 1640

#Unit 4. Cell Communication and Cell Signaling

An immune response against grass pollen often involves:

TLS Online TPP Program

#Question id: 1641

#Unit 4. Cell Communication and Cell Signaling

Why are secondary antibody responses better?