Biology DSE Core
Tears and saliva contain an enzyme called....? - answerLysozyme
The wound is red & hot due to? - answerIncreased blood flow
The wound is swollen due to? - answerAccumulation of tissue fluid
There is pain in the wound because? - answerPressure built up in the swollen tissue
stimulates pain receptors in the skin
B cells (B lymphocytes) are formed and mature in...? - answerBone marrow
T cells (T lymphocytes) are formed and mature in? - answerFormed in bone marrow
Mature in thymus gland
After maturation of B, T cells, they circulate where? And gather where? -
answerCirculate in the blood and lymph
Or gather at some organs e.g. Spleen & Lymph nodes
Activated B cells differentiate into what? - answerPlasma cells & memory B cells
Plasma cells' function? - answerRelease antibodies into the blood to act against
pathogens that have not yet entered body cells (extracellular pathogens)
Memory B/T cells' function? - answer'Remember' the type of antigen so they can
respond quickly in any subsequent invasion by the same type of antigen
3 ways of antibodies acting against pathogens/their toxins - answerLysis of the
pathogens
Agglutination → faciliate phagocytosis
Act as antitoxins, neutralizing toxins by binding to them → toxins become harmless
When helper T cell is activated, it activates other T cells to secrete....And they do what?
- answerLymphokines
They activate phagocytes to carry out phagocytosis
T cells multiply and differentiate into...? - answerKiller T cells
Memory T cells
Killer T cell's function? - answerBind to infected cells
Kill them directly by making holes in their cell membranes
Tears and saliva contain an enzyme called....? - answerLysozyme
The wound is red & hot due to? - answerIncreased blood flow
The wound is swollen due to? - answerAccumulation of tissue fluid
There is pain in the wound because? - answerPressure built up in the swollen tissue
stimulates pain receptors in the skin
B cells (B lymphocytes) are formed and mature in...? - answerBone marrow
T cells (T lymphocytes) are formed and mature in? - answerFormed in bone marrow
Mature in thymus gland
After maturation of B, T cells, they circulate where? And gather where? -
answerCirculate in the blood and lymph
Or gather at some organs e.g. Spleen & Lymph nodes
Activated B cells differentiate into what? - answerPlasma cells & memory B cells
Plasma cells' function? - answerRelease antibodies into the blood to act against
pathogens that have not yet entered body cells (extracellular pathogens)
Memory B/T cells' function? - answer'Remember' the type of antigen so they can
respond quickly in any subsequent invasion by the same type of antigen
3 ways of antibodies acting against pathogens/their toxins - answerLysis of the
pathogens
Agglutination → faciliate phagocytosis
Act as antitoxins, neutralizing toxins by binding to them → toxins become harmless
When helper T cell is activated, it activates other T cells to secrete....And they do what?
- answerLymphokines
They activate phagocytes to carry out phagocytosis
T cells multiply and differentiate into...? - answerKiller T cells
Memory T cells
Killer T cell's function? - answerBind to infected cells
Kill them directly by making holes in their cell membranes
