AP Biology · Unit 6: Gene Expression and Regulation
6.1 DNA and RNA Structure
In short
You must understand that DNA (and sometimes RNA) is the primary source of heritable information. You need to distinguish between prokaryotic genomes (typically circular chromosomes) and eukaryotic genomes (multiple linear chromosomes condensed with histones and associated proteins). The presence of plasmids in both prokaryotes and eukaryotes should be noted.
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What else do you need to know about DNA and RNA Structure?
Furthermore, you must know the structural differences between purines (guanine and adenine, double ring) and pyrimidines (cytosine, thymine, uracil, single ring) and how they pair specifically (A-T/U and G-C). No specific exclusions are listed for this topic.
Can you do these?
- I can explain that genetic information is stored in DNA and sometimes RNA, and contrast prokaryotic circular chromosomes with eukaryotic linear chromosomes.
- I can describe plasmids as extra-chromosomal circular DNA molecules found in both prokaryotes and eukaryotes.
- I can identify purines and pyrimidines by their ring structures and describe their specific base pairing rules.
How is DNA and RNA Structure tested on the exam?
You may be asked to describe the structures involved in heredity and the characteristics of DNA that make it suitable as hereditary material. The suggested skill for this topic is 'Concept Explanation', meaning you should be prepared to explain these biological concepts and processes in applied contexts, potentially linking DNA structure to its function in information storage and transmission.
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DNA and RNA Structure: common questions
What do you need to know about DNA and RNA Structure for AP Biology?
You must understand that DNA (and sometimes RNA) is the primary source of heritable information. You need to distinguish between prokaryotic genomes (typically circular chromosomes) and eukaryotic genomes (multiple linear chromosomes condensed with histones and associated proteins). The presence of plasmids in both prokaryotes and eukaryotes should be noted.
How is DNA and RNA Structure tested on the AP Biology exam?
You may be asked to describe the structures involved in heredity and the characteristics of DNA that make it suitable as hereditary material. The suggested skill for this topic is 'Concept Explanation', meaning you should be prepared to explain these biological concepts and processes in applied contexts, potentially linking DNA structure to its function in information storage and transmission.
How do I know I have mastered DNA and RNA Structure?
Check you can do each of these: explain that genetic information is stored in DNA and sometimes RNA, and contrast prokaryotic circular chromosomes with eukaryotic linear chromosomes; describe plasmids as extra-chromosomal circular DNA molecules found in both prokaryotes and eukaryotes; identify purines and pyrimidines by their ring structures and describe their specific base pairing rules.
Where does DNA and RNA Structure fit in AP Biology?
DNA and RNA Structure is topic 6.1 in Unit 6: Gene Expression and Regulation of AP Biology.
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