Which material is not found in endoskeletons? a) calcium carbonate b) bone c) silica d) cartilage

In which situations is the principle of cross-cutting relationship useful in determining relative age?

One of the newest applications of cell technology is called cybrid embryos. this process involves replacing the nuclear material of an animal cell with human nuclear material. how might this process affect public policies about research by using stem cells? the same policies and concerns about the use of human embryonic stem cells would most likely apply. the embryos would most likely be treated like traditional animal embryos and regulated accordingly. the process of forming cybrid embryos would most likely be banned by government regulators. the embryos would be treated as regular cells because they are not fully human in origin.

What is the role of dna ligase in the elongation of the lagging strand during dna replication?