Biological Molecules
14 questions· page 1 of 2
Calculate the percentage of the total human body mass made up from the three most common elements.
Name two types of substance found in the human body that contain only carbon, hydrogen and oxygen.
- ______
- ______
Human tissues contain different percentage masses of the elements shown in Fig. 3.1.
Suggest one tissue that contains a relatively high percentage mass of nitrogen and explain your answer.
Explain, using examples, why proteins are essential for all living organisms.
Name the process represented by the arrow drawn between Fig. 1 and Fig. 2.
Describe the use of enzymes in this process.
name of process = ______
use of enzymes = ______
Large molecules in cells are made from smaller molecules.
Complete Table 1.1 to show which small molecules make up each large molecule.
Choose the small molecules from this list.
Table 1.1
| large molecule | small molecules |
|---|---|
| protein | |
| cellulose | |
| lipid |
Enzymes in the alimentary canal are involved in reactions that break down large molecules into small molecules, for example, starch into maltose.
Give an example in another, named part of the body, where small molecules are built up into larger ones.
named part of the body = ______
small molecules = ______
larger molecules = ______
All enzymes contain carbon. List three other chemical elements that must be present in each molecule of an enzyme.
- ______
- ______
- ______
State two substances, other than starch and sugar, that contribute to the total mass of the seed at stage 1.
- ______
- ______
Suggest why the alimentary canal does not produce any enzymes to work on vitamins.
Name both the substrate and product of amylase.
substrate ______
product ______
Name four chemical elements that will always be present in an antibody molecule.
______ ______ ______ ______