A characterstic common to both difussion and active transport is that 1. Enzymes are required
2. Oxygen is moved across a membrane
3. ATP is needed
4. The movement of molecules occurs

Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries

The first amino acid of a new polypeptide chain is

How is transcription similar to translation in terms of base pairing?