Fundamentals of Biology (SB251) - Introductory Study Notes

Course Overview: Fundamentals of Biology (SB251)

Introduction

This course provides a foundational understanding of biology, focusing on the properties that define life, the relationship between structure and function, taxonomic classification, energy flow, gene expression, and evolutionary principles. The course is taught by Dr. Isabella Muratore.

Course Structure and Policies

Course Format and Rules

• Classroom Etiquette: Phones should not be used unless specified; laptops may be used freely during lecture.

• Attendance: Classes will not be cancelled except under extreme circumstances. Notify in advance if you need to miss class.

• Academic Integrity: Excused absences only for medical issues indicated in advance. Address the instructor as Dr. Muratore or Professor Muratore.

Assignments and Exams

• Assignments: Due every 1-2 weeks; open notes and open time format.

• Exams: Cumulative interim and final exams.

• Lab Assignments: Prelabs and practical exams; some labs offer bonus opportunities.

Recommended Study Strategies

• Read lecture slides and notes thoroughly.

• Attend office hours and use provided resources (lecture notes, slides, textbook).

• Practice problems and use flashcards for memorization.

• Collaborate with peers and communicate with the instructor for help.

Core Topics in General Biology

Characteristics of Life

Living organisms share several defining properties that distinguish them from non-living matter.

• Cellular Organization: All living things are composed of one or more cells.

• Response to Environment: Organisms detect and respond to stimuli.

• Homeostasis: Maintenance of stable internal conditions.

• Metabolism: Chemical processes that provide energy and build cellular components.

• Reproduction: Ability to produce new individuals.

• Organization: Structured arrangement from molecules to cells to tissues and organs.

Relationship Between Structure and Function

Biological structures are intricately linked to their functions at molecular, cellular, tissue, and organismal levels.

• Example: The structure of enzymes determines their ability to catalyze specific biochemical reactions.

• Additional info: The shape of red blood cells allows efficient oxygen transport.

Taxonomic Groups of Life Forms

Life is classified into major taxonomic groups based on cellular structure and evolutionary relationships.

• Prokaryotes: Organisms without a nucleus (e.g., Bacteria, Archaea).

• Eukaryotes: Organisms with a nucleus and membrane-bound organelles (e.g., Animals, Plants, Fungi, Protists).

Feature	Prokaryotes	Eukaryotes
Nucleus	No	Yes
Cell Membrane	Yes	Yes
Organelles	Few (e.g., ribosomes)	Many (e.g., mitochondria, ER)
Examples	Bacteria, Archaea	Animals, Plants, Fungi

Flow of Energy on Earth

Energy flows through ecosystems from the sun to producers and then to various levels of consumers.

• Producers: Organisms (e.g., plants) that convert solar energy into chemical energy via photosynthesis.

• Primary Consumers: Herbivores that eat producers.

• Secondary Consumers: Carnivores that eat herbivores.

• Detritivores: Organisms that consume dead organic matter.

Gene Expression and the Central Dogma

Gene expression is the process by which genetic information is used to synthesize proteins.

• Central Dogma: Describes the flow of genetic information: DNA is transcribed to RNA, which is translated to protein.

$\text{DNA} \xrightarrow{\text{transcription}} \text{RNA} \xrightarrow{\text{translation}} \text{Protein}$

• Gene: A segment of DNA that codes for a specific biomolecule, often a protein.

• Nucleotide: The building block of nucleic acids, consisting of a phosphate group, a sugar, and a nitrogenous base.

Natural Selection and Adaptation

Natural selection is a mechanism of evolution where environmental pressures result in differential survival and reproduction of organisms.

• Adaptation: The process by which populations evolve traits that enhance survival and reproduction.

• Example: Mice with fur color matching their environment are less likely to be eaten by predators.

Scientific Laws, Theories, and Hypotheses

Science distinguishes between laws, theories, and hypotheses based on their explanatory power and evidence.

• Scientific Law: Describes what happens under certain conditions (e.g., Law of Gravity).

• Theory: Explains why phenomena occur, supported by extensive evidence (e.g., Theory of Evolution).

• Hypothesis: A testable statement or prediction.

Term	Description
Law	Describes what happens
Theory	Explains why it happens
Hypothesis	Testable prediction

Cladistics and Taxonomy

Cladistics is a method of classifying organisms based on common evolutionary history and shared characteristics.

• Synapomorphies: Shared derived traits that group members and are inherited from a common ancestor.

• Taxonomic Classification: Organisms are named using binomial nomenclature (Genus species), e.g., Panthera tigris for the tiger.

Laboratory and Course Logistics

Lab Requirements

• Bring your own goggles when specified.

• Complete pre-lab assignments before class.

• Lab sessions held in MI-060.

Textbook and Materials

• Acquire the textbook (Chapters 2-5 required early in the course).

• Bring goggles to lab when specified in the syllabus.

Summary of Key Learning Objectives

• Identify and describe the properties that define life.

• Explain the relationship between structure and function in biological systems.

• Classify organisms into major taxonomic groups.

• Describe the flow of energy through ecosystems.

• Outline the process of gene expression and the central dogma.

• Understand natural selection and adaptation.

• Distinguish between scientific laws, theories, and hypotheses.