Yeast is a fungus and needs a supply of energy for its living and growth. Sugar supplies this energy. (Your body also gets much of its energy from sugar and other carbohydrates.). Yeast can use oxygen to release the energy from sugar (like you can) in the process called respiration. So, the more sugar there is, the more active the yeast will be and the faster its growth (up to a certain point-even yeast cannot grow in very strong sugar-such as honey).
Molecules are held together by either covalent bonding or ionic bonding. Several types of non-metal elements exist only as molecules in the environment. For example, hydrogen only exists as hydrogen molecule. A molecule of a compound is made out of two or more elements.
The two forces that hold atoms together in a molecule are the electric force and the nuclear force. These forces bind the three parts of an atom, which include electrons, neutrons and protons. Continue Reading. Electrons, which have a negative charge, orbit the nucleus in an atom. Protons, which have a positive charge, are inside the nucleus. Because electrons and protons have opposite charges, the electric force causes them to pull toward one another. An atom usually contains the same number of electrons and protons.