Climate Zones Objectives: 1. Describe Earth's major climate zones. 2. Explain how climate zones are characterized. Notes: According to the three cell convection model of each hemisphere the Earth neatly separates itself into three distinct climate zones; the polar, temperate, and the tropical zones.limate Zones Objectives: 1. Describe Earth's major climate zones. 2. Explain how climate zones are characterized. Notes: According to the three cell convection model of each hemisphere the Earth neatly separates itself into three distinct climate zones; the polar, temperate, and the tropical zones.
The nucleus is a large roundish organelle. It is bounded by a double membrane which has numerous pores. Inside the nucleus are chromosomes and a dark region called a nucleolus which makes ribosomes. (Ribosomes are necessary for protein synthesis.)
The tricky part is that DNA is found inside the nucleus of the cell, but the ribosome, which is the protein manufacturing factory where the protein is actually put together is located outside the nucleus in the gel-like cytoplasm. So your cells need a way to get the information from the DNA to the ribosome. This task is carried out by RNA, or ribonucleic acid. RNA comes in different varieties that help the process along during the two major phases of protein synthesis.