BIO 121 Exam Questions and Answers with Complete Solutions Graded A+
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Course
Bio 121
Institution
Bio 121
BIO 121 Exam Questions and Answers with Complete Solutions Graded A+
What makes cells living? - Answers There is no 1 characteristic. There are many. -E, reproduction, maintain homeostasis, respond to stimuli, etc.
The Cell Theory - Answers All living things are made up of cells. All cells come f...
BIO 121 Exam Questions and Answers with Complete Solutions Graded A+
What makes cells living? - Answers There is no 1 characteristic. There are many. -Ex.cells, reproduction,
maintain homeostasis, respond to stimuli, etc.
The Cell Theory - Answers All living things are made up of cells. All cells come from pre-existing cells.
Metabolism - Answers Chemical processes that occur IN cells to maintain life.
Homeostasis - Answers Maintaining a constant interal enviroment despite changes in the external
enviroment. -Ex. body temp, Blood pH 7.4, HR 72, bp 120/80
Stimulus - Answers A change in the environment
What fashion do chemical reactions occur? - Answers In an orderly fashion for a purpose
Evolution - Answers A change in the frequency of genes (alleles) in a population over time
Environmental impact - Answers huge in deciding evolution
Gene therapy - Answers the science of replacing a defective gene with the "correct" or normal gene
What is a way to correct genetic disorders which are caused by the inheritance of a defective gene? -
Answers Gene Therapy
What is science? - Answers Science is a process that is always changing. It acquires knowledge through
EVIDENCE.
Hypothesis - Answers a tentative explanation of events or an observation
Can a hypothesis be false? - Answers A hypothesis can be false and undergoes rigorous testing in order
to try and eliminate it.
A hypothesis must be... - Answers -Testable
-unambiguous
-able to be supported or rejected based on scientific evidence
Science is done by... - Answers 1) Observation
2) Process of Research
inductive reasoning - Answers the development of general principles based on the examination of
specific cases
Ex. Ants at a picnic
,Generalization: All ants have 6 legs
Deductive reasoning - Answers the use of general principles to describe or interpret specific cases;
involves an "if...then" style of thinking; often used to determine a falsifiable hypothesis
Ex.
If- All birds have feathers
Then- Since an Eagle is a bird, it ahs feathers
***What does DNA stand for? - Answers Deoxyribonucleic Acid
What is the function of DNA? - Answers DNA is a molecule that stores genetic information in the
sequence of its subunits (nucleotides)
Rosylin Franklin - Answers 1950s physicist who used X-ray crystallography to discover that DNA is in the
form of a double helix
Living organisms... - Answers 1. are made of cells
2. require energy
3. maintain homeostasis
4. grow, develop, and reproduce
5.respond to stimuli
6. have highly ordered chemical reactions
7. undergo evolution
What do you need to contribute to evolution? - Answers Grandchildren
***What is the first step in any scientific investigation? - Answers Observation
What are the steps of the scientific method? - Answers 1. Observation
2. Question
3. Hypothesis
4. Prediction
5. Experiment
, 6. Collect data and analyze it using statistics
7. Conclusion
Observation - Answers -makes notes of key characteristics over time
- includes descriptions, record keeping, and measurements
Ex.
Compound X has been found to be effective in killing cancer cells grown in a petri dish in a lab.
Scientific Literature - Answers research source
Pre-Experiment - Answers Make sure question is unanswered, if answered ask another question
What question can we ask? - Answers Can Compound X be used to effectively kill cancer in mice?
alternative hypothesis - Answers Other possible answers to the question, but must be tested separately
Hypothesis Ex - Answers Compound X kills cancer in mice
Prediciton - Answers -scientists propose what would happen in the experiment if the hypothesis was
supported
-important to have an idea of what will likely occur
-uses IF...THEN (deductive reasoning)
Two forms of predictions are... - Answers 1) general- one beverage has more caffeine than the other
2) specific- a person will feel more energized from drinking the beverage with the higher caffeine
content
Experiments... - Answers -are designed to verify a hypothesis
-are used to eliminate hypothesizes until one can be supported by data
Parallel Experiments - Answers 1) test experiment (experimental) : alter one variable
2) control experiment: the variable is not altered; the control experiment matches the test experiment
in all variables except the one being tested
If hypothesis is rejected... - Answers Develop a new hypothesis and new experiment
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