Midterm Flashcards
A community is
a group of interacting organisms coexisting in an area
Adaptations are
Changes in gene sequence produce proteins that allow a group of organisms to grow and reproduce in their environment.
An ecosystem
An area of the world, with its interaction organisms, and physical environment
An experiment requires
An independent variable, a dependant variable, a control variable, and controllable variables
an organ system
is a group of organs working together
Biodiversity is
The variety of life on Earth or an area of the Earth
Homeostasis is
organisms maintaining a stable internal environment
Metabolism is
The sum of all the chemical reactions in organisms
Natural selection
is an important process in Evolution
Natural selection means
The differential survival and reproduction of an organism better suited for a particular environmental challenge
Most single-cell organisms
Have no nucleus and have no membrane-covered organelles and are called prokaryotes
Most single-cell organisms
are found in Domains Bacteria and Archaea.
Some single-cell organisms
have a nucleus and are found in Domain Eukaryote.
The single-cell organisms with a nucleus are called
Protists
In a lab, we studied the Challenges facing scientists name one
“Emerging Diseases” and “Population Growth”
The steps of an experiment are
a. observation. d.experiment or test
b. Question. e. Conclusion
c. Hypothesis
What force causes the formation of helical(helix) structures in macromolecules?
Hydrogen Bonds
What elements are always found in organic molecules?
Carbon and Hydrogen
What are the four forms of protein structure
a. primary c.. Tertiary
b. Secondary d. Quaternary
What are the organic molecules?
a. Carbohydrates c. proteins
b. Lipids. d. Nucleic Acids
The valence shell of an atom must contain–_______ electrons to be full.
8
What two elements are exceptions to the 8 electrons in a valence shell?
Hydrogen and Helium
What does a covalent bond mean?
Elections are shared in the valence shells of both atoms
What does an ionic bond mean?
Transfer of one or more valence electrons from one atom to another
