Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science Practice test

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Prepare for the Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science exam. Utilize flashcards and multiple-choice questions with hints and explanations to succeed in your certification.

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What contribution did Watson and Crick make to the field of biology?

Discovery of microorganisms
Structure of DNA
Classification of species
Theory of evolution

The correct answer is: Structure of DNA

Watson and Crick made a groundbreaking contribution to biology by elucidating the structure of DNA. Their research in the early 1950s led to the discovery that DNA is structured as a double helix, composed of two strands wound around each other, with bases paired in a specific manner (adenine with thymine and cytosine with guanine). This discovery was foundational in understanding how genetic information is stored, replicated, and transmitted in living organisms. It paved the way for numerous advancements in genetics, molecular biology, and biotechnology, significantly impacting the fields of medicine, forensics, and bioinformatics. The identification of the DNA structure also provided insight into processes such as mutations and genetic inheritance, fundamentally changing our understanding of biology.