Study the sentences describing the steps of protein synthesis. Which sequence places the steps in the correct order? 1. Transfer RNA picks up individual amino acids and carries them to the ribosome.

2. Ribosomal RNA bonds mRNA and tRNA.

3. A single strand of DNA serves as a template for making mRNA.

4. Messenger RNA carries the sequence of nucleotides to the ribosomes.

5. A protein is synthesized.

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.