The building block of DNA is called the nucleotide, which is composed of a nitrogenous base (adenine, guanine, cytosine, or thymine), a five-carbon sugar (deoxyribose in DNA), â¦ and one to three phosphate groups. + 16 others found this useful.
Special cases of minimum ages and intervals. Two childhood vaccines require a bit more explanation regarding scheduling: â¢. MMR at age 1 year â Many statesâ school and childcare regulations specify that the minimum age for receipt of MMR vaccine be âon or after the first birthday,â with no allowance for a grace period.
Children should receive two doses of MMR vaccineâthe first dose at 12 through 15 months of age and the second dose at 4 through 6 years of age. Giving the second dose of the vaccine earlier is allowed at any time as long as it is at least 28 days after the first dose.hese 3 vaccines are safe given together. MMR is an attenuated (weakened) live virus vaccine. This means that after injection, the viruses grow and cause a harmless infection in the vaccinated person with very few, if any, symptoms.