AnswersFL-2000315-Biology 1 CRHypotheses, Theories, and Laws

Hypotheses, Theories, and Laws — Unit test Answers

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The brothers pictured below are identical twins.The boys in this picture look alike because their bodies contain identical

Question illustration
A
carbohydrates.
B
lipids.
C
nucleic acids.
D
proteins.
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Which statement describes how enzymes and substrates are related?

A
The enzyme influences the speed of change from substrate to product.
B
Enzymes are released as substrates in a chemical reaction.
C
An enzyme is a special kind of substrate in a chemical reaction.
D
Substrates combine with enzymes to form reactants.
23

Dr. Katherine Pollard, a biostatistical researcher, recently changed the method that she used to compare human and chimpanzee DNA. Her research showed that the differences between the two species’ DNA are in segments called switches, which turn certain genes on or off. What is the most likely outcome of Dr. Pollard’s research?

A
Other scientists will repeat her analysis and this may lead to changes in theories.
B
The laws of segregation and independent assortment will change.
C
Dr. Pollard will change experimental methods and repeat the study.
D
The hypothesis will be rewritten to match the outcome of the study.
24

Which component is affected when a catalyst is added to a chemical reaction?

A
the amount of substrate
B
the activation energy
C
the amount of product
D
the concentration of reactants
25

Sometimes new information results in minor changes to a theory. But sometimes new information results in a theory being discarded as incorrect. An example of an incorrect theory that was disproved by the discovery of new information is

A
Ptolemy’s theory of the solar system.
B
the original cell theory.
C
the germ theory.
D
plate tectonic theory.

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