Answer: The reason is because DNA polymerase which is the enzyme that catalyzes the synthesis of DNA has a 3'->5' exonuclease activity that double-checks each nucleotide after it is added.
Explanation: The 3'->5' exonuclease activity of DNA polymerase allows the enzyme to double-check and remove a newly added wrong nucleotide. It is highly specific for mismatched base pairs. When the DNA polymerase adds a wrong nucleotide to the growing strand, translocation of the enzyme to the position where the next nucleotide is to be added is halted, but the exonuclease activity of the DNA polymerase removes the incorrectly paired nucleotide so that replication can continue. The process of double-checking a newly added nucleotide and removal of any incorrectly paired nucleotide by the DNA polymerase is called proofreading.
Answer:
There are three types of survivorships:
Type 1: Type 1 survivorship includes organisms which have high chances of surviving through the early and middle stages of life. Their population tends to decline in the old age. For example, humans
Type 2: Type 2 survivorship contains organisms which have a constant mortality rate. The chances of an individual to die are independent of their age.For example, birds
Type 3: Type 3 survivorship includes organisms which have a rapid death rate during the early stages and only a few organisms survive till adulthood.
Answer:
1st has A and G whereas 2nd has C and T.
Explanation:
There are three common haplotypes present in the population. The first single nucleotide polymorphism has A and G alleles while on the other hand, the second single nucleotide polymorphism has C and T alleles. The four possible combinations of haplotypes for the above two single nucleotide polymorphisms are AC, AT, GC, and GT.
Plastic is abiotic because it is non-living