Describe the significance of each of the molecules in gene expression. DNA

mRNA

tRNA

rRNA

Amino Acid

Polypeptide

The reactions that occur in the ribosome, where amino acids are combined to form proteins are anabolic or catabolic?

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?