Bio 100 Exam 1 SDSU Questions And
Answers.
What is Biology? - (Correct Answer) study of living organisms.
What type of science is bio? - (Correct Answer) Natural Science, occurs
naturally in nature not man made. Others are math, physics,or geology.
Five steps of scientific method? - (Correct Answer) 1) Observe
2) Hypothesize
3) Make prediction
4) Test
5) Draw a conclusion
Observe - (Correct Answer) Look for interesting patterns or cause-and-effect
relationships
Formulate a hypothesis - (Correct Answer) Hypothesis: a proposed explanation
for observed phenomena
Null hypothesis: a hypothesis that states a lack of relationship between two
factors; stated as a negative
Ex. "Echinacea has no effect on the duration and severity of cold symptoms"
Hypothesis must be falsifiable to be scientific
Make a prediction - (Correct Answer) o "If...Then..."
o Must be testable
Conduct an experiment - (Correct Answer) o An experiment that makes it
possible to decisively determine whether a particular hypothesis is correct
o Need experimental groups, placebo, control groups, treatment, variables etc.
Hypothesis vs Law and Principle - (Correct Answer) o Hypothesis: a proposed
explanation for observed phenomena
o Theory: a hypothesis that has been repeatedly tested and supported
, o Law (Principle): a theory that has been repeatedly tested and supported
Comparative method - (Correct Answer) Special case of the scientific method
o Ex: Seals are more closely related to dogs than to cats (can't really test
anything)
o Compares patterns of similarity between seals, dogs, and cats
o Cannot be tested with traditional experiments
Placebo - (Correct Answer) a substance that has no effect, used as a control in
testing new drugs
Atoms - (Correct Answer) Atoms are the subunit of all life including molecules
There are 92 naturally occurring atoms
Consist of:
Nucleus (Protons [+] and Neutrons[0])
Electrons (Negative charge; rotate around nucleus in "shells")
4 atoms of life. make up 95% of all life - (Correct Answer) carbon
oxygen
nitrogen
hydrogen
(COHN - carbon oxygen hydrogen nitrogen)
atomic number - (Correct Answer) number of protons in nucleas
mass number - (Correct Answer) protons plus nuetrons
isotope - (Correct Answer) same element different mass numbers. same
electrons and protons but different numbers of neutrons
Isotopes may be stable -- nuclei remain intact.
Some isotopes are unstable and emit particles and energy: radioactive isotopes.
Radioactive isotopes emit radiation
Answers.
What is Biology? - (Correct Answer) study of living organisms.
What type of science is bio? - (Correct Answer) Natural Science, occurs
naturally in nature not man made. Others are math, physics,or geology.
Five steps of scientific method? - (Correct Answer) 1) Observe
2) Hypothesize
3) Make prediction
4) Test
5) Draw a conclusion
Observe - (Correct Answer) Look for interesting patterns or cause-and-effect
relationships
Formulate a hypothesis - (Correct Answer) Hypothesis: a proposed explanation
for observed phenomena
Null hypothesis: a hypothesis that states a lack of relationship between two
factors; stated as a negative
Ex. "Echinacea has no effect on the duration and severity of cold symptoms"
Hypothesis must be falsifiable to be scientific
Make a prediction - (Correct Answer) o "If...Then..."
o Must be testable
Conduct an experiment - (Correct Answer) o An experiment that makes it
possible to decisively determine whether a particular hypothesis is correct
o Need experimental groups, placebo, control groups, treatment, variables etc.
Hypothesis vs Law and Principle - (Correct Answer) o Hypothesis: a proposed
explanation for observed phenomena
o Theory: a hypothesis that has been repeatedly tested and supported
, o Law (Principle): a theory that has been repeatedly tested and supported
Comparative method - (Correct Answer) Special case of the scientific method
o Ex: Seals are more closely related to dogs than to cats (can't really test
anything)
o Compares patterns of similarity between seals, dogs, and cats
o Cannot be tested with traditional experiments
Placebo - (Correct Answer) a substance that has no effect, used as a control in
testing new drugs
Atoms - (Correct Answer) Atoms are the subunit of all life including molecules
There are 92 naturally occurring atoms
Consist of:
Nucleus (Protons [+] and Neutrons[0])
Electrons (Negative charge; rotate around nucleus in "shells")
4 atoms of life. make up 95% of all life - (Correct Answer) carbon
oxygen
nitrogen
hydrogen
(COHN - carbon oxygen hydrogen nitrogen)
atomic number - (Correct Answer) number of protons in nucleas
mass number - (Correct Answer) protons plus nuetrons
isotope - (Correct Answer) same element different mass numbers. same
electrons and protons but different numbers of neutrons
Isotopes may be stable -- nuclei remain intact.
Some isotopes are unstable and emit particles and energy: radioactive isotopes.
Radioactive isotopes emit radiation
