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BIO 156- Exam 1 with 100% correct Answers
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BIO 156- Exam 1 with 100% correct Answers
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BIO 156- Exam 1 with 100% correctAnswers
List features that distinguish living organisms from nonliving matter.
consists of one or more cells, movement (require energy and nutrients),
homeostasis, reproduction (DNA)
Describe the levels of organization in the living world.
atoms - molecules - cells- tissue- organs- organ system- organism - population -
community - ecosystem- biosphere
List the three domains of life and distinguish between each domain.
-Bacteria - do not contain a nucleus, single cell
-Archaea - do not contain a nucleus have a different cell wall then bacteria, single
cell
-Eukarya - cells contain a nucleus, single or multi cell
List four kingdoms within the domain Eukarya and distinguish between them.
-Protista - mostly unicellular, have chloroplast and cellulose (slime mold, amoeba,
kelp)
-Plantea -multicellular with cell walls made of cellulose. They have chloroplasts
and prepare their own food through photosynthesis. ( plants, flowers, and
mosses)
-Animalia - Animalia are multicellular. However, they are lacking chloroplasts and
cell walls. Can not prepare their own food (Heterotrophs). ( insects, fishes,
mammals, and reptiles)
-Fungi- have chitin in their cell walls and they are heterotrophs. ( mushrooms and
yeasts)
, List and describe the steps involved in solving a problem using hypothesis-based
science.
-Observation - simple statement that can be tested
-Hypothesis - Simple statement of expected outcome (Null Hypothesis: There is
no difference...)
-Experiment - Testing Hypothesis
-Control Group - no change made, reference group
-Experimental Group - once variable (independent variable) changed and
compared to control group
-Conclusion - reject or fail to reject hypothesis,if fail to reject null hypothesis is
proven true
Explain how electron configuration influences the chemical properties of an atom.
The valence (outer shell) electrons want the outer shell to be full. In order to
achieve this, they will react to either lose or gain or share electrons
Describe the formation of a hydrogen bond and explain how it differs from a
covalent or ionic bond.
A hydrogen bond forms when hydrogen is covalently bonded to one atom while
also being attracted to another. Covalent and ionic bonds are intramolecular
(between atoms of a molecule), while hydrogen bonds are intermolecular
(between whole molecules).
Describe how water contributes to the fitness of the environment that supports
all life.
Water contributes to all life on earth. Many organisms are made up of mostly
water. All cells are about 70% water. The abundance of water makes life on earth
possible.
Explain the basis for the pH scale.
-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, low number of
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