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Massachusetts Comprehensive Assessment System

2012, High School Biology

  Question 12: Open-Response  
The graph shows the changes in antibiotic resistance of Streptococcus pneumoniae over time.
  1. Based on the graph, which antibiotic had Streptococcus pneumoniae become most resistant to by 1999?
  2. Describe what usually happens to a population of Streptococcus pneumoniae immediately after it is exposed to a new antibiotic.
  3. Explain, in detail, how antibiotic-resistant populations of Streptococcus pneumoniae develop over time as a result of the process of natural selection.

Scoring Guide and Sample Student Work
Select a score point in the table below to view the sample student response.

ScoreDescription
4 The response shows a thorough understanding of how evolution through natural selection can result in changes in biodiversity through the increase or decrease of genetic diversity within a population. The response correctly identifies the antibiotic to which Streptococcus pneumoniae had become most resistant, clearly describes what usually happens to a population of Streptococcus pneumoniae immediately after it is exposed to a new antibiotic, and clearly explains how antibiotic-resistant populations of Streptococcus pneumoniae develop as a result of natural selection.
4
3 The response shows a general understanding of how evolution through natural selection can result in changes in biodiversity through the increase or decrease of genetic diversity within a population.
2 The response shows a limited understanding of how evolution through natural selection can result in changes in biodiversity through the increase or decrease of genetic diversity within a population.
1 The response shows a minimal understanding of how evolution through natural selection can result in changes in biodiversity through the increase or decrease of genetic diversity within a population.
0 The response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

High School Biology

Question 12: Evolution and Biodiversity
Question 23: Biochemistry and Cell Biology
Question 32: Anatomy and Physiology
Question 44: Genetics
Question 45: Ecology

Return to the MCAS 2012 Student Work Directory



Last Updated: November 6, 2014
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