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.
A...is held together by covalent bonds. water molecule: An example of a molecule held together by covalent bonds is ... . water: What does it mean to say a water molecule is âpolarâ? Draw a diagram of water to show the answer: Polar molecules have a positive region â in water it is the two hydrogen atoms. If the atoms in a water molecule are held together by covalent bonds, what type of bond holds multiple molecules together? Hydrogen bonds: How are hydrogen bonds and cohesion related? Hydrogen bonds keep water molecules packed tightly together. Cohesion is when two molecules of the same substance are attracted to each other and they stick together. What causes surface tension? Cohesion â the attraction of water molecules to each other. What is the opposite of cohesion?