Need help with biology questions?

Can you help me answer the following quesitons. I'm really stuck and can't answer them.

1. Innate immunity:

A) Is activated immediately upon infection.

B) Utilizes highly specific antigen receptors on B cells.

C) Is based on recognition of antigens that are specific to different pathogens.

D) Depends on a newly infected animal's previous exposure to the same pathogen.

E) Is found only in vertebrate animals.

2. Engulfing-phagocytic cells of innate immunity include all of the following except

A) Dendritic cells.

B) Neutrophils.

C) Natural killer cells.

D) Macrophages.

3. An inflammation-causing signal released by mast cells at the site of an infection is

A) Histamine.

B) Mucus.

C) An interferon.

D) Sodium ions.

E) Lymphatic fluid.

4. The site of inflammation may become swollen due to the increased numbers of cells and fluids at the site and painful due to signals from pain receptors.

A) True

B) False

5.Secondary immune responses upon a second exposure to a pathogen are due to the activation of

A) Macrophages.

B) Memory cells.

C) Stem cells.

D) T cells.

E) B cells.

Thanks

1 Answer

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  • Betty
    Lv 7
    8 years ago
    Best Answer

    . Innate immunity:

    A) Is activated immediately upon infection.

    2. Engulfing-phagocytic cells of innate immunity include all of the following except

    B) Neutrophils.

    D) Macrophages.

    3. An inflammation-causing signal released by mast cells at the site of an infection is

    A) Histamine.

    4. The site of inflammation may become swollen due to the increased numbers of cells and fluids at the site and painful due to signals from pain receptors.

    A) True

    5.Secondary immune responses upon a second exposure to a pathogen are due to the activation of

    B) Memory cells.

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