UMKC BIOLOGY 108 LAB PRACTICAL
#1 EXAM QUESTIONS AND ANSWERS
GRADED A+ 2026
Why might amylase have a low activity in the stomach? - ANS "If amylase did not work at a
pH of 4, is it reasonable to assume it will not work at a pH lower than 4 as well."
...pH in the stomach is much lower than the ideal pH for activation of amylase (in the mouth
and small intestine). The rxn rate outside of its ideal conditions slows down significantly or can
halt all together.
What is the scientific method? - ANS A flexible process that involves asking questions, making
observations, developing an explanatory hypothesis, and testing those hypotheses
What is a hypothesis? - ANS A proposed, tentative, testable explanation for an observed
phenomenon. It is based on observations, assumptions.
How can you test a hypothesis? - ANS Experiments, additional observations, synthesis of
information available
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
1
, A scientifically useful hypothesis must be...? - ANS testable and falsifiable (able to be proved
false)
Even though the hypothesis can be falsified, it can never be proven true. The evidence from an
investigation can only...? - ANS provide support for the hypothesis
Why can't we 100% prove a hypothesis? - ANS We cannot test all alternative hypothesis. We
can only confirm or reject a hypothesis.
For a question to be pursued by scientists, the phenomenon must be _____? The elements
must be _____? - ANS 1. well defined and testable
2. measurable and controllable
What is an independent variable? - ANS The manipulated variable of the experiment
What is a dependent variable? - ANS The variable measured, counted, or observed in
response to the experimental conditions
What is a controlled variable? - ANS The variables kept constant throughout the experiment
What is the difference between a controlled variable and a control? - ANS Controlled
variables are (alternative independent) variables that are kept constant during the experiment.
These variables can have a significant effect on the result of the experiment.
Control is when the independent variable is omitted or has a standard value.
What is a procedure? - ANS The experimenter's sequence of steps
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
2
#1 EXAM QUESTIONS AND ANSWERS
GRADED A+ 2026
Why might amylase have a low activity in the stomach? - ANS "If amylase did not work at a
pH of 4, is it reasonable to assume it will not work at a pH lower than 4 as well."
...pH in the stomach is much lower than the ideal pH for activation of amylase (in the mouth
and small intestine). The rxn rate outside of its ideal conditions slows down significantly or can
halt all together.
What is the scientific method? - ANS A flexible process that involves asking questions, making
observations, developing an explanatory hypothesis, and testing those hypotheses
What is a hypothesis? - ANS A proposed, tentative, testable explanation for an observed
phenomenon. It is based on observations, assumptions.
How can you test a hypothesis? - ANS Experiments, additional observations, synthesis of
information available
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
1
, A scientifically useful hypothesis must be...? - ANS testable and falsifiable (able to be proved
false)
Even though the hypothesis can be falsified, it can never be proven true. The evidence from an
investigation can only...? - ANS provide support for the hypothesis
Why can't we 100% prove a hypothesis? - ANS We cannot test all alternative hypothesis. We
can only confirm or reject a hypothesis.
For a question to be pursued by scientists, the phenomenon must be _____? The elements
must be _____? - ANS 1. well defined and testable
2. measurable and controllable
What is an independent variable? - ANS The manipulated variable of the experiment
What is a dependent variable? - ANS The variable measured, counted, or observed in
response to the experimental conditions
What is a controlled variable? - ANS The variables kept constant throughout the experiment
What is the difference between a controlled variable and a control? - ANS Controlled
variables are (alternative independent) variables that are kept constant during the experiment.
These variables can have a significant effect on the result of the experiment.
Control is when the independent variable is omitted or has a standard value.
What is a procedure? - ANS The experimenter's sequence of steps
@COPYRIGHT 2026/2027 ALL RIGHTS RESERVED
2
