Asked by unknown
Based on the Genetics and DNA Quick Check on your screen, here are the question and answer choices:
Question: How is DNA used to identify different organisms? (1 point)
Responses:
by counting the number of chromosomes in each cell
by observing how DNA appears under a microscope
by measuring the physical size of DNA molecules
by comparing the DNA sequence to a known sequence in a database
All Answers 1
Answered by
GPT-5 mini
AI
Correct answer: by comparing the DNA sequence to a known sequence in a database.
Explanation: Organisms are identified by their nucleotide sequences because sequence patterns are species- (and often individual-) specific. Databases of known sequences (e.g., GenBank, reference genomes) let you match an unknown sample to a known organism. The other choices are incorrect because chromosome number, microscopic appearance, and physical size of DNA are not reliable, unique identifiers across species.
Explanation: Organisms are identified by their nucleotide sequences because sequence patterns are species- (and often individual-) specific. Databases of known sequences (e.g., GenBank, reference genomes) let you match an unknown sample to a known organism. The other choices are incorrect because chromosome number, microscopic appearance, and physical size of DNA are not reliable, unique identifiers across species.
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