<P> In meiosis, the DNA is replicated only once, while the cell divides twice . DNA replication only occurs before meiosis I. DNA replication does not occur when the cells divide the second time, in meiosis II . Replication, like all cellular activities, requires specialized proteins for carrying out the job . </P> <P> Cells are capable of synthesizing new proteins, which are essential for the modulation and maintenance of cellular activities . This process involves the formation of new protein molecules from amino acid building blocks based on information encoded in DNA / RNA . Protein synthesis generally consists of two major steps: transcription and translation . </P> <P> Transcription is the process where genetic information in DNA is used to produce a complementary RNA strand . This RNA strand is then processed to give messenger RNA (mRNA), which is free to migrate through the cell . mRNA molecules bind to protein - RNA complexes called ribosomes located in the cytosol, where they are translated into polypeptide sequences . The ribosome mediates the formation of a polypeptide sequence based on the mRNA sequence . The mRNA sequence directly relates to the polypeptide sequence by binding to transfer RNA (tRNA) adapter molecules in binding pockets within the ribosome . The new polypeptide then folds into a functional three - dimensional protein molecule . </P> <P> Unicellular organisms can move in order to find food or escape predators . Common mechanisms of motion include flagella and cilia . </P>

What are the visible anatomical features that are different between an animal cell and plant cell