Answer:
- A, B, C and D are: elements or molecules
- A and B are: reactants
- C and D are: products
Explanation:
The expression "A + B <--> C + D" represents a chemical equation. A chemical equation represents the "mixture" of molecules or elements that will react and form other molecules and elements, so we can say that A, B, C and D represent molecules or elements.
But not only that. In a chemical equation, the elements and molecules that are before the symbol "<-->" represent the reagents in the equation. Therefore, A and B are the reagents. The elements or molecules found after the symbol "<-->" are the products of the reaction. Therefore, C and D are the products.
Coelophysis was one of the first true dinosaurs to appear in the late Triassic, is was an agile, bipedal carnivore.
Coelophysis was a small fast running carnivorous dinosaur. Coelophysis was found in Upper Triassic. Coelophysis means 'hollow form', and this comes from the hollow limb bones. Coelophysis was a light-weight hunter that looked like a bird having long legs. The Fossil evidence shows that this dinosaur ate small crocodile-like reptiles. This predator was about 9 feet long.
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Answer:
The correct answer is D) short-lived plasma cells that secrete antibodies for the antigen
Explanation:
Each B lymphocyte has an antigen receptor (BCR: B cell receptor), a surface immunoglobulin (IgM or IgD), that binds to specific domains of the antigen called antigenic determinants or epitopes. Only B lymphocytes with a high antibody affinity for the antigen, and which are capable of processing and presenting it, will be positively selected. In this contact between the two cells, an exchange of chemical signals takes place that leads to the activation, clonal proliferation and differentiation of B cells into two sister subclones: one of antibody-secreting plasma cells, and the other of memory primed B cells. Therefore, only these last positively selected B lymphocytes will survive, proliferate and differentiate into plasma cells, synthesizing and secreting antibodies of a single isotypic class, with a unique specificity and high affinity, improving the ability to adhere to the antigen and, thus , neutralize and destroy pathogens.
Calcium chloride is a salt, which is used in household and in industries. The calcium chloride is an ionic compound which can be split in ionic form such as one cation (Ca2+) and two anions (Cl-). Therefore, the cation in the CaCl compounds is Ca2+ ions.
