1
HUMAN BIO WEEK 2 EXAM LATEST VERSION -2025/2026- 100+
Q AND ANS ALL THE BEST
Distinguish between ionic and covalent bonds
Ionic bonds result from transfer of electrons, whereas covalent bonds are formed
by sharing.
Describe the properties of water
Water is a highly polar molecule, capable of forming hydrogen bonds with itself
and with solutes.
Explain the role of hydrogen bonds in the properties of water.
The presence of hydrogen bonds also makes water molecules more 'sticky' or in
scientific terms cohesive and adhesive. The small charges on the water molecules
allows them to stick together which is why water has a 'skin' that small insects can
walk on, and also explains why water can be sucked up a straw so easily
Summarize the structure of the pH scale and the importance of buffers to
biological systems.
The pH of a solution is a measure of the concentration of hydrogen ions in the
solution. A solution with a high number of hydrogen ions is acidic and has a low
pH value. ... Buffers are important in biological systems because of their ability to
maintain constant pH conditions.
List the four classes of organic molecules found in cells.
carbohydrates, lipids, proteins, and nucleic acids.
Describe the processes by which the organic molecules are assembled and
disassembled.
HUMAN BIO WEEK 2 EXAM LATEST VERSION -2025/2026- 100+
Q AND ANS ALL THE BEST
Distinguish between ionic and covalent bonds
Ionic bonds result from transfer of electrons, whereas covalent bonds are formed
by sharing.
Describe the properties of water
Water is a highly polar molecule, capable of forming hydrogen bonds with itself
and with solutes.
Explain the role of hydrogen bonds in the properties of water.
The presence of hydrogen bonds also makes water molecules more 'sticky' or in
scientific terms cohesive and adhesive. The small charges on the water molecules
allows them to stick together which is why water has a 'skin' that small insects can
walk on, and also explains why water can be sucked up a straw so easily
Summarize the structure of the pH scale and the importance of buffers to
biological systems.
The pH of a solution is a measure of the concentration of hydrogen ions in the
solution. A solution with a high number of hydrogen ions is acidic and has a low
pH value. ... Buffers are important in biological systems because of their ability to
maintain constant pH conditions.
List the four classes of organic molecules found in cells.
carbohydrates, lipids, proteins, and nucleic acids.
Describe the processes by which the organic molecules are assembled and
disassembled.
