In children, the serum IgG level normally reaches the rate of the adult around the age of: A - 6 months B - 18 months C - 3 years old D - 6 years old E - 13 years old
The right answer is 3 years old. IgG is normally expressed in children from the age of 3 years. As for the other enzymes, IgE and IgA reach the adult level around the age of 12-13 years. IgM reaches the adult's rate by the age of 10 months.
Which enzyme plays an important role in the conversion of arachidonic acid to leukotrienes?
The enzyme is lipoxygenase. Lipoxygenase is a variety of enzymes that can cause oxidation of fatty acids. There are several varieties of lipoxygenases, some of which are present in plants. They are involved in the formation of white blood cells that are involved in some severe allergic reactions (anaphylaxis). It is based on this knowledge that antiallergic drugs have been developed to inhibit the activity of lipoxygenase, including reducing inflammatory reactions. Leukotrien are named thus because they were discovered in leucocytes and that they are unsaturated lipids with 3 conjugated double bonds (trienes) and 20 carbon atoms
A student compared DNA replication to making a photocopy of a document . How to best describe the discription ?
The tools of DNA replication are: the DNA itself, which is assimilated to the original paper to be photocopied. The DNA polymerase, which is assimilated to the photocopier (it is she who will replicate the DNA). The nucleotides: which are assimilated to virgin paper and ink (once assembled (photocopied with respect to the original DNA), they will give the DNA copy). The electric current is assimilated to ATP, in fact ATP plays a very important role in the operation of the enzyme (the photocopier).