BIO105 Introductory Biology, Wed., Sept., 2nd, David Champlin, USM

Overview

David Champlin introduces BIO105 at the University of Southern Maine, explaining its attendance and quiz policies, multiple-choice exam strategy, and campus pathways into biology careers. He frames evolution as biology’s central organizing pattern, using cell structure, DNA comparisons, orthologous genes, insulin, and Archaea to connect modern research with common ancestry, while emphasizing visual note-making and active recall as study methods.

Key takeaways

Evolution is a unifying pattern across biology: shared cellular features and DNA similarities allow researchers to test common ancestry and make predictions.
Orthologues are genes in different species that descend from a common ancestral gene; evidence includes both DNA similarity and retained function.
Recombinant DNA technology lets bacteria produce human insulin by inserting the human insulin gene, replacing insulin historically purified from pigs.
For missed BIO105 classes, students must email Champlin notes from the recording within one week; recordings are expected to be deleted after about eight days.
Champlin recommends converting biology material into drawings, labels, and visual flashcards because active recall and self-generated organization support exam learning better than passive rereading.
USM students can explore career paths through specific opportunities including Bigelow Laboratory’s semester program, MaineHealth research internships, and Roux Institute biotechnology placements.

Chapters

0:00 BIO105 Logistics: Low-Stakes Quizzes and Attendance

David Champlin says there will be no Monday class because of a holiday, and a 10-question multiple-choice practice quiz will take the final 10 minutes of Wednesday’s class.
The quiz covers two videos posted in Brightspace announcement 2; missed low-stakes in-class quizzes do not receive makeups.
Students with testing accommodations may arrange a separate setting, but Champlin notes that the quiz is low stakes.

7:00 Chapter One and Evolution as Biology’s Organizing Principle

Champlin argues that evolution should not be treated as just one of a textbook’s five biology themes; it is the framework connecting biological topics.
He aims to orient students to the course, explain how to learn successfully, and help them map future opportunities without requiring an immediate career decision.
Students are encouraged to bring questions about interests ranging from dentistry to turtles, and to explore those interests through campus connections.

11:00 Reading Chapter One for Multiple-Choice Exams

Champlin recommends learning the textbook’s five themes well enough to recognize them, while noting that the list is partly useful as a straightforward exam question.
He says exam questions will focus on prominent material rather than trick questions or obscure footnotes.
Students should distinguish the textbook’s themes from evolution, which Champlin presents as a broader organizing principle.

14:00 Three Domains, Archaea, and DNA-Based Classification

The traditional classification places life in three domains—Bacteria, Archaea, and Eukarya—with domain at the top of the taxonomic hierarchy.
DNA research beginning in the 1970s distinguished Archaea from bacteria despite their similar-looking single-celled forms; newer research places eukaryotes within an archaeal lineage, challenging the simple three-domain picture.
Archaea live in settings such as deep-sea hydrothermal vents and human digestive systems; methane-producing organisms in the gut are archaea.

18:00 Visual Learning and Research on Life’s Origins

Champlin recommends drawing, labeling, and organizing concepts on flashcards because active recall is stronger than merely rereading slides or textbook pages.
A paper published in early August prompted discussion of archaea at a hydrothermal vent and the chemistry of environments that may have preceded life.
The research raises the possibility that life’s earliest precursors relied on geochemical reactions before fully developed cellular metabolism.

22:00 Evolutionary Patterns, Cells, and Homology

Champlin describes scientific research as collecting data, identifying patterns, and using reliable patterns to make predictions.
Shared features across life—including cells and phospholipid cell membranes—are examples of patterns that support biological predictions.
Homologous structures or genes reflect common ancestry, whereas analogous features can perform similar functions without sharing that ancestral origin.

29:00 DNA Comparisons and Orthologous Genes

Human proteins average about 400 amino acids, and human DNA encodes 20 common amino acids across roughly 20,000 protein-coding genes.
Researchers compare DNA sequences and protein functions across species to identify orthologues: genes in different species inherited from a common ancestral gene.
Comparisons across organisms such as humans, dogs, and yeast reveal conserved genes and proteins, even when species diverged hundreds of millions of years ago.

33:00 Convergent Enzymes and Evidence for Common Ancestry

Some bacteria and archaea use structurally different enzymes to catalyze the same essential cellular reaction, illustrating analogous solutions rather than shared orthology.
Scientists combine DNA sequence comparisons, protein structures, and biochemical function to test whether molecular features share a common origin.
Champlin uses these comparisons to show how present-day organisms provide evidence for evolutionary relationships extending far into the past.

37:00 Pig Insulin, Recombinant DNA, and Diabetes Treatment

Before recombinant DNA methods, insulin for people with diabetes was purified from pig blood; pig insulin worked in humans but differed slightly from human insulin.
By around the 1980s, scientists could insert the human insulin gene into bacteria and produce human insulin for medical use.
The example links orthology and protein function to biotechnology: bacterial cells can manufacture a human protein when given its gene.

43:00 Course Policies: Recordings, Participation, and Assignments

Champlin records classes and posts them online, but plans to delete recordings after about eight days so students must turn them into notes promptly.
Participation means attending and signing the sheet; students who miss class must email notes from the recording within one week to document participation.
Assignments are announced in numbered Brightspace posts, usually with about a week to complete them, and may involve drawing, labeling, or solving problems.

48:00 AI Study Aids and the Three-Exam Course Plan

Champlin permits students to use AI for study support, such as generating notes or practice questions from class recordings, and asks them to share tools they find useful.
He cautions that AI-generated material can introduce examples outside the course, which may not fit questions focused on specific examples taught in class.
The course has three exams, each with 80 multiple-choice questions; the first covers introductory material including chemistry, cells, and biological molecules.

54:00 USM Biology Majors and Maine Career Pathways

USM biology students can pursue the traditional biology major or concentrations in biotechnology and human biology.
Champlin points to Maine opportunities in biotechnology, healthcare, aquaculture, and natural resources, including former USM students who built careers at IDEXX Laboratories.
A biology-program information session is scheduled for the following Tuesday and Wednesday during the 12:30–1:30 common hour.

59:00 Bigelow Laboratory and MaineHealth Research Internships

Rachel Lasley-Rasher connects students with marine-biology research and opportunities at Bigelow Laboratory for Ocean Sciences near Boothbay Harbor.
A semester program at Bigelow offers USM-tuition coursework, student housing, and shared meals, with options relevant to marine biology and biotechnology.
Champlin also highlights a year-long research internship at MaineHealth Institute for Research, where students can gain biomedical laboratory skills and work with faculty affiliated with Tufts University School of Medicine.

1:05:00 Roux Institute, Campus Biotechnology, and Student Networking

The Roux Institute, connected to Northeastern University, supports graduate programs and biotechnology ventures; USM undergraduates can intern with its scientists and startup partners.
Examples of campus-linked ventures include algae-based replacements for plastics or paper, renewable alternatives to concrete, and Hound Bio’s cancer-detection research involving dogs.
Champlin encourages students to approach faculty beyond their assigned advisor, use the Learning Center on the library’s second floor, and connect with peers who share career interests.
For the next class, students should review chapter one, begin chapter two, prepare questions, and take the 10-question quiz on the two assigned videos.

Summary, takeaways, and chapters were generated by AI from the video's transcript and may contain errors. The video belongs to its creator, The New Evolution for Everyone.