The nuclear membrane is often thought of as a protective structure, separating the genetic material from the rest of the cell. however, mrna must be able to leave the nucleus to travel to a ribosome. how is this accomplished?
a. mrna attaches to a transport protein and exits through a gated channel.
b. mrna is small enough to diffuse across the lipid bilayer of the nuclear membrane.
c. mrna exits through nuclear pore complexes.
d. mrna is enclosed in vesicles which fuse with the membrane and exit.

Which is not a type of symmetry? a. asymmetryb. radial symmetryc. bilateral symmetryd. lateral symmetry

Tropical rain forests support more species per unit area than any other terrestrial ecosystem. what is one way rain forests are important to the health of the biosphere?

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.