BioTime: Recent Episodes
Christopher Jang
Welcome to BioTime, a place for you to learn high school biology, pass your exams, and understand the science of life. This podcast, hosted by Christopher Jang, features episodes that teach important biology concepts in a simple and easy way to understand.
In society, we have many different people with different roles and ecological communities are no different. All organisms are interconnected through a complex web of interactions and a way we can describe the composition of species in a certain geographic location is to look at community structure. Today we will be exploring community structures, species diversity, species richness, species evenness, keystone species, and foundational species.
As humans, we walk, talk, run, and do an endless list of tasks a day, all of which require energy. Where is all of this power generated from? In this podcast, we will be discussing the structure of a mitochondrion, the function of a mitochondrion, and how cellular respiration takes place within the mitochondrion.
The Earth formed around 4.5 billion years ago. Over the past billions of years, evolution has greatly changed life as we see it today. If we transport ourselves back in time and look at cells, we will notice that they are extremely simple. But, in the present day, we notice that cells have become much more complicated beings with very complex processes that require many entities in order to function. The process of how this occurred is known as the endosymbiotic theory. This podcast will discuss what the endosymbiotic theory is and the evidence that supports it.
Our cells are very complicated and require and require many different enzymes, proteins, ions, and more in order to function properly. They need all of these different biological necessities to be at the right place and at the right time. How do our cells have so much control over all of these necessities? The answer lies in active and passive transport. This podcast dives into how active and passive transport work along with examples.
Our cells are constantly sending messages to each other through a complex network of signaling molecules. In today's podcast, we will explore paracrine signaling, autocrine signaling, endocrine signaling, and direct contact in depth along with examples of each.
In the 1860s, famous scientist Gregor Mendel explored the laws that governed genetics and devised the Law of Segregation. This law is crucial to our understanding of genetics today. In this episode, we dive into the details of how Mendel made this revolutionary discovery and go into depth on the Law of Segregation.
In 1865, Gregor Mendel conducted an experiment on pea plants that transformed our understanding of genetics. In this podcast, we will explore how he conducted his experiment and what he discovered.
When we look at a species, oftentimes we notice that they do not all look exactly the same. Perhaps the color of their fur differs or the length of their legs varies. This variation is natural and is essential for survival. In this episode, we explore how this variation can be preserved in order to maintain a healthy population. The six mechanisms we discuss are balanced polymorphism, sexual reproduction, outbreeding, diploidy, heterozygote advantage, and frequency dependant selection.
Cell cycle regulation helps our cells control when they want to divide and when they do not. In this episode, we dive into cyclins, cyclin-dependant kinases, mautration-promoting factors, platelet-derived growth factors, and p53.
Mutations are essential to the survival of organisms. It drives evolution, creating diversity. But, it also has its consequences. In this episode, we explore the benefits of mutations but also their pitfalls. We discuss gene mutations, chromosomal mutations, insertions, deletions, point mutations, and diseases caused by mutations.
With countless organisms roaming the Earth, it is important to have a system to classify them all. The 3-Domain Classification System is a way to sort organisms into 3 categories: bacteria, archaea, and eukarya. In this episode, we explore each of these classfications and the criteria each requires.
Enzymes play a large role in enzymatic reactions so being able to control them is essential. In this podcast, we explore competitive inhibition, noncompetitive inhibition, and cofactors and how they affect enzymes.
Community Ecology is the discussion of all of the interactions between organisms in a community. Today, we will be going into depth on the 5 categories of community ecology: competition, predation, herbivory, symbiosis, and facilitation.
The world of science is advancing faster than ever, especially in biotechnology. With scientists pushing through the frontier, many innovations are being made and it is important to keep up. In today's episode, we will be discussing CRISPR, Polymerase Chain Reactions, Restriction Enzymes, Gel Electrophoresis, and DNA probes. Additionally, we will also be discussing the ethics involved in the biotech industry.
Water is essential to life on Earth. Without it, no life as we know it would exist today. Water has many essential properties that allow for it to sustain life on this Earth and this podcast goes into detail on the 5 major properties: high specific heat, high heat of vaporization, universal solvent, strong cohesion tension, and ice is less dense than water. We will also be discussing atomic structure and types of bonds in order to better understand the properties of water.
This podcast reviews environmental impacts on enzymes topic 3.3. Enzymes are incredibly important as they are what allow our bodies to complete the required reactions and keep us alive! We will be discussing denaturation and the three major environmental impacts on enzymes which are temperature, pH, and concentration of substrates and inhibitors.
Darwin's Theory of Natural Selection has served as a basis to this day for the reasoning behind evolution. It has assisted us to answer our largest questions concerning how and why species look the way they do. In this episode, we explore Darwin's voyage on the HMS Beagle, the five major points on his theory of natural selection, and Lamarck's views on evolution and why they are incorrect.
Every living organism you have ever seen has been the result of evolution. If we were to look back on humans millions of years ago, we would have looked drastically different compared to how we look today. In this episode, we discuss the five main factors that contribute to evolution: Genetic drift, gene flow, mutations, non-random mating, and natural selection. We explore the effects each factor and examples of how they allow a population to undergo evolution.
Mendelian principles have served as a gateway into the functions of how our genetic information is passed on. Over time, we have discovered principles beyond mendelian genetics. In this episode, we review multiple alleles, incomplete dominance, and codominance. We discuss how they function and the examples of each form on inheritance.
If you have any questions, feel free to send them to https://anchor.fm/christopher-jang/message or https://2255christopher.wixsite.com/biotime/questions
The road to discovering the genetic material of cells, DNA, was a long journey. In this episode, we explore the three experiments that led to this discovery: The Griffith experiment, The Avery–MacLeod–McCarty experiment, and the Hershey Chase experiment.
If you have any questions, feel free to send them to https://anchor.fm/christopher-jang/message or https://2255christopher.wixsite.com/biotime/questions
Cells live in an ever-changing environment, always needing to be aware of their surroundings and reacting to an organism's needs. In order to understand when to take action, cells must receive a message from the outside world in a process called reception. Reception is the first of three steps in cell signaling. In this episode, we review how signaling molecules bind to receptors inside and outside of the cell, along with covering specific cell surface receptors like the G protein-coupled receptors, tyrosine kinases, and ion channel receptors.
If you have any questions, feel free to send them to https://anchor.fm/christopher-jang/message or https://2255christopher.wixsite.com/biotime/questions
Vacuoles are an essential part of our endomembrane system. They deal with a variety of tasks like storage and getting rid of toxic waste! In this episode, we will explore the vacuole's structure and function.
If you have any questions, feel free to send them to https://anchor.fm/christopher-jang/message or https://2255christopher.wixsite.com/biotime/questions
Lysosomes, an essential part of the endomembrane system, are reviewed in this episode. The podcast opens by discussing the structure and then transitions into a thorough explanation of the functions of a lysosome. Finally, the episode quickly gives a short review on Tay-Sachs disease.
If you have any questions, feel free to send them to https://anchor.fm/christopher-jang/message or https://2255christopher.wixsite.com/biotime/questions
In this episode, we review a major organelle of the endomembrane system, the Golgi Apparatus. The podcast explores the structure, function, and how the cisternal maturation model works in complete detail.
If you have any questions, feel free to send them to https://anchor.fm/christopher-jang/message or https://2255christopher.wixsite.com/biotime/questions
In this podcast, a major organelle of the Endomembrane system is discussed, the Endoplasmic Reticulum. The episode opens with a discussion on the ER as a whole and then goes into detail on the structure and function of the ER's two counterparts, the smooth and rough ER.
If you have any questions, feel free to send them to https://anchor.fm/christopher-jang/message or https://2255christopher.wixsite.com/biotime/questions
What are the differences between Eukaryotes and Prokaryotes? This episode begins by discussing the essential components that all cells need and then transitions into in-depth explanations on Prokaryotes and Eukaryotes. The episode closes with a comparison between the two cell types.
If you have any questions, feel free to send them to https://anchor.fm/christopher-jang/message or https://2255christopher.wixsite.com/biotime/questions