A:)))))))))))))))))))))))))))))))
Answer:
There are two main types of stem cells: embryonic stem cells and adult stem cells.Stem cells provide new cells for the body as it grows, and replace specialised cells that are damaged or lost. They can divide over and over again to produce new cells.
A new DNA strand elongate only in the 5' to 3' direction during DNA replication because the "polarity of the DNA molecule prevents addition of nucleotides at the 3' end" .
DNA replication occurs in the 5' to 3' direction. DNA polymerase can only add nucleotides to the 3' OH group of the growing DNA strand, this is why DNA replication occurs only in the 5' to 3' direction.
DNA polymerase can only add to the 3' end, so the 5' end of the primer remains unaltered. Consequently, synthesis proceeds immediately only along the so-called leading strand.
Hence, the correct answer will be option (B)
To learn more about DNA strand here
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Answer: B)
The chemical composition of the cell walls of each in the two kingdoms varies.
Explanation: Usatestprep
Sycamore trees (Platanus occidentalis) make handsome shade trees for large landscapes.
