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Exam (elaborations)

BIOL 123N – Old Dominion University – Exam 1 Study Guide and Key Concepts

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BIOL 123N – Old Dominion University – Exam 1 Study Guide and Key ConceptsThis document provides a focused study guide for Exam 1 of BIOL 123N at Old Dominion University. It covers foundational biology topics, including cell structure and function, basic genetics, molecular biology, and introductory physiology. The material is organized to reinforce key concepts and support effective exam preparation.

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Institution
Old Dominion University
Course
BIOL 123N

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BIOL 123N – Old Dominion University – Exam 1 Study Guide and Key
Concepts
What is evolution? - correct answer ✔✔ The biological change over generations.



Which biological molecule endows biological systems with an intrinsic ability to change over
generations? - correct answer ✔✔ DNA



Which property of a molecule enables change? - correct answer ✔✔ The alleles



What is artificial selection? - correct answer ✔✔ The process of modifying organisms by
selection in breeding by humans.



What is an allele? - correct answer ✔✔ Two or more alternate forms of gene because of
mutation, that are found on the same place on a chromosome.



What is a genotype? - correct answer ✔✔ The genetic makeup of a cell.



What is a phenotype? - correct answer ✔✔ The observable genetic characteristics of an
individual



What is natural selection? - correct answer ✔✔ A process where organisms adapt over time to
their environment to survive and produce more offspring.



Which human traits have increased in frequency over generations due to natural selection? -
correct answer ✔✔ The improvement of the ability to catabolize carbohydrates and the ability
to metabolize toxins in things we ingest.
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Course
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Uploaded on
February 27, 2026
Number of pages
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Written in
2025/2026
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