BIOL 1311 Global Carbon Cycle
Study Guide – Fall 2006
Use this guide to assist you in your study of the material covered in the global carbon
Keep in mind, however, that it is not an exhaustive review of the material
To assist you in answering the questions, the concepts addressed here generally
follow the order in which the material is presented in lecture.
Feel free to work with your
peers on these questions.
Introduction to global carbon cycling
1) Describe the difference between biotic and abiotic elements of an ecosystem?
consists of all the organisms in a particular region along with nonliving
components. These nonliving, or
, components include air, water, and soil. The
components, in contrast, consist of other members of the organism’s own species as well as
individuals of other species. Biotic components are made of organic molecules.
2) How are organic molecules different from inorganic molecules?
contain C-H bonds and are associated with living beings whereas inorganic
molecules are those primarily associated with the non-living (mineral) world that do not contain
is the formation of formation of C-H bonds through the process of
photosynthesis by harnessing energy from the sun.
3) Describe the three categories of life history strategies used in lecture.
life history strategy
is an organism’s approach to survival including mechanisms for exploiting
the environment, coping with hazards and reproducing
Mobile Predatory Heterotrophs:
= seeks prey
= feeds on energy
from chemicals assembled by other organisms
Ex: All animals (
), some protozoa (
Bacteria and Archaea
Walled Autotrophs: autotroph
= self feeders,
somewhat mobile, collect energy from
nonliving world, most do so through
Ex: Almost all plants (
, exception = some parasites)
) – ancestor to
Some bacteria – inventers of photosynthesis, very small
part are photosynthetic =
solution feeders = take in dissolved
Ex: Fungi (
Most bacteria (
4) Why is a carbohydrate such as methane higher in energy than a molecule of CO
Methane is less stable than CO
, thus it is higher in electronegativity. CO
is more stable and does
not want to give up its electrons. The electrons are stores and moved in methane through high
energy molecules such as ATP.
5) Why is CO
critical for plant growth?
It is a substrate for photosynthesis. Without it, the plant can not produce energy.
6) Do plants need oxygen to grow?