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pogonyaev
3 years ago
5

Which of the following is NOT a characteristic of living things? A)one or more cells B)complex chemical activity C)reproduction

D)nuclear reactions
Biology
1 answer:
almond37 [142]3 years ago
3 0
D) Nuclear Reactions. I do not get cancer from my dog.
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Explain the interaction that occurs between a t-helper lymphocyte and a b cell when the b cell is being induced to produce peanu
Paraphin [41]

Answer:

           According to Dr. Ray Schiling (member of the American Academy of Anti-aging medicine) about 1.5 million people suffer from peanut allergies. The seeds of peanut (<em>Arachis hypogea</em>) contain an array of allergens that can induce the production of IgE specific antibodies predisposed individuals. Ara1 and Ara2 are most common seed storage protein that cause allergy. Other allergen proteins such as Ara3 to Ara 17 have also been identified that cause allergy.  


Entry of peanut allergen into body

When peanut allergens enter the body of an individuals it leads to development of different symptoms like itchy skin, tingling sensation, nausea, runny nose and anaphylaxis.  

Allergic response

There are two subsets of T-cells Th1 and Th2. Both invoke different response to allergens. Th1 direct a non-allergic response while Th2 direct allergic response ranging from releasing of histamine to anaphylactic response. The presence of IL-12 cytokines direct a Th1 based, nonspecific response.  


Mechanism of allergic response (interaction between helper T cell and B cell)

Step 1.  

           When allergen enter to body they are encountered by B cells. Immunoglobulin receptors on the surface of B cells recognize antigen (Peanut allergens) and get attached, which are then internalized and processed. Within B cells the fragments of antigens combine with HLA class 2 proteins.  

Step 2

             HLA class 2 with antigen fragments (peanut allergens) then display on the surface of B cells.

Step 3

            Receptors on the surface of helper T cells recognizes the complex of HLA class 2 and antigen fragments (peanut allergen) and is activated to produce cytokines, which activate the B cells.  

Step 4

             B cell is activated by cytokines and begins clonal expansion. Some of the progeny become anti-body producing plasma cells while other become memory B cells.  


7 0
3 years ago
The cytoplasm of animal cells has a concentration of potassium ions (K+) as much as 20 times higher than the concentration outsi
Nataly [62]
<span>Active transport means</span><span> moving against a concentration gradient, from a lower concentration to a higher one</span>
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On: What does a cactus, house fly, and your grandmother have in common?
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Answer:

They're all pr*cks.

8 0
3 years ago
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What is the connective tissue covering the entire muscle called
Alborosie
The epimysium

each muscle is surrounded by a connective tissue sheath called the epimysium fascia, connective tissue outside the epimysium, surrounds and separates the muscles.
6 0
2 years ago
Which position of the pendulum would have the least amount of potential energy.
kkurt [141]

Answer:

a) 1 & 5

Explanation:

For a pendulum bob, it is customary to call the lowest position the reference position or the zero level. So when the bob is at the equilibrium position

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