Bio 101 Study Guide For Exam #1
Why is biology relevant to your life?
How does evolution relate to biology?
Describe six characteristics of living things
Cellular Organization- living things consist of
one or more cells, cells are organized
Change Over Time- many living thing grow, living things evolve or go extinct
Interaction- Between organism and itself, environment, and other organisms
Reproduction- have genes(blueprint), produce offspring similar to themselves
Transformation of Energy- Acquire and use energy, carry out n control chemical
Emergent Properties- The whole is equal to greater than the sum of the parts
Explain how cells are the basic unit of life.
All organisms consist of cells. All cells originate from pre-existing cells. Cell
membranes separate an organism from the external environment. Organisms have evolved
form single-celled to multicellular.
Describe the hierarchical organization of biology.
Why is an understanding of biological chemistry important for biology?
For water, polar structures and hydrogen bonds between water molecules. For carbon
and biologically important molecules like carbs, lipids, proteins, nucleic acids
Describe the characteristics of carbon that make it an important biological molecule.
Carbon can form 4 covalent bonds with other molecules. 4 means that carbon
compounds have a huge variety of structures, tends to bond with other carbon and few other
atoms, H, O, N
Explain how polarity, hydrogen bonds and ionization ability make water an important
Water is polar = polar and charged molecules dissolve easily, also means it can be
contained in membranes (which are non-polar). Hydrogen bonds are fairly strong, takes a lot
of energy to break them, large amounts of energy are stored in them.
What properties is the strength of hydrogen bonds responsible for?
The properties are
- water molecules stick together, water can be
pulled up vessels,
- surface of water difficult to puncture, skimming
Density of Water
- maximum density of water at 4°C, increases space
between molecules when frozen, ice floats, bodies of water freeze from top down, life
persist under ice.
Describe the thermal properties of water that are of importance to living things.
Melting and freezing-