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Massachusetts Comprehensive Assessment System



MCAS QUESTION OF THE DAY:

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2015 February Biology, Biology - High School
Download PDF Document Question 20 - Multiple-Choice

Reporting Category: Evolution and Biodiversity
Standard: 5.1 - Explain how evolution is demonstrated by evidence from the fossil record, comparative anatomy, genetics, molecular biology, and examples of natural selection.

 
Cytochrome c is a protein needed for aerobic cellular respiration. It is found in nearly all organisms. The amino acid sequence of cytochrome c can be different in different organisms. The table below shows the number of differences observed when the amino acid sequences of cytochrome c in different organisms are compared.
 
Organisms
 
  Number of Differences 
between Amino Acid
Sequences
 horses and whales5
 chickens and snakes18
 silk moths and snakes 29
 whales and penguins10
Which of the following conclusions is best supported by this data?
 
 
 

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Last Updated: May 24, 2018
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