Fill in the Blanks Fill in the Blanks: Parts of a CellOnline version Test your knowledge of the parts of a cell by filling in the blanks with the correct terms. by Dayra Novella Álamos 1 genetic cell nucleus The is the control center of the and houses all of the cell ? s information . 2 Ribosomes proteins genetic produce by assembling amino acid sequences according to the instructions contained in the code . 3 mitochondria energy Cells biochemical need energy to power their reactions , and most of that is released by . 4 transport membranes process cell The endoplasmic reticulum is a network of inside a , and its main functions are to and new materials . 5 cel Lysosomes recycle function is to break down and unwanted material for the 6 protects cytoplasm organelles water The are mainly composed of . It surrounds and the of the cell . 7 separates cell membrane external The cell controls which substances enter and leave the , and also the interior of the cell from its environment .