VACUOLES Antonyms

• the protoplasm of a cell excluding the nucleus; is full of proteins that control cell metabolism

• a part of the cell containing DNA and RNA and responsible for growth and reproduction

• the positively charged dense center of an atom

• a small group of indispensable persons or things

• (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail

• any histologically identifiable mass of neural cell bodies in the brain or spinal cord

• the central structure of the lens that is surrounded by the cortex

• plastid containing chlorophyll and other pigments; in plants that carry out photosynthesis

• A spherical or ovoid organelle found in the cytoplasm of eukaryotic cells and containing genetic material separate from that of the host; it is responsible for the conversion of food to usable energy in the form of ATP.

• (sometimes proscribed) mitochondrion

• a specialized part of a cell; analogous to an organ

• an organelle in the cytoplasm of a living cell; they attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid; when it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell

• a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell

• a netlike structure in the cytoplasm of animal cells (especially in those cells that produce secretions)