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 are given a second dose of MMR before they start school, usually between the ages of three and five, although the second dose can be given as quickly as three months after the first if there's an urgent need, such as in an outbreak.dults who missed out on the MMR vaccination as a baby and are therefore not immune can have the MMR vaccine on the NHS. It's given to adults as two doses, with the second dose given at least a month after the first.