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PODCAST

Cellular and Molecular Biology for Research

Ahmadreza Gharaeian

Cellular and Molecular Biology for Research is the podcast where complex textbooks stop gathering dust and start making sense. Each episode breaks down the dense chapters of cellular and molecular biology—DNA, signaling pathways, protein folding, experimental techniques—into clear explanations for students, early-career researchers, or anyone who wants to actually understand the science instead of just memorizing it. Think of it as your study buddy who reads the heavy stuff, translates the jargon,

health & fitness medicine

All Episodes

00:59:10

Photon to Perception: Reverse Engineering Vision, the...

Cellular and Molecular Biology for Research ·

2026/03/04

Vision is our window to both the microscopic and the cosmic — from spotting a mosquito on your nose to glimpsing galaxies millions of light-years away. Yet for all its apparent simplicity, seeing is one of the most complex feats biology has ever pulled off.In this episode, we peel back the layers of how the brain turns light — mere electromagnetic waves bouncing through space — into meaning. You’ll discover how evolution built the eye as a living camera, and how the retina, a literal piece of the

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00:46:28

The Chemistry of Perception — Taste, Smell, and the...

Cellular and Molecular Biology for Research ·

2026/03/01

Long before brains existed, life was already listening — not to sounds or sights, but to chemicals. From single-celled bacteria to humans, survival has always depended on detecting the molecules that mean food, danger, or love. In this episode, we dive into the most ancient and universal senses of all: taste and smell.We’ll explore how evolution shaped our ability to sense the world through chemistry — from bacteria swimming toward nutrients to humans savoring the sweetness of honey or catching the

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00:53:52

Inside the Brain: A Guided Tour of Neuroanatomy...

Cellular and Molecular Biology for Research ·

2026/02/22

Before we dive into how the brain works, we need to know how it’s built. In this episode, we open the Illustrated Guide to the Brain — your map to the physical landscape of the nervous system.We’ll explore the brain not just as a concept, but as a real, three-dimensional structure with surfaces, sections, and systems that all fit together inside the skull. From the folds of the cerebral cortex to the deep cores of the brainstem and spinal cord, this guided tour will show how anatomy lays the

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01:11:49

The Brain's Blueprint: From Simple Tube to Conscious...

Cellular and Molecular Biology for Research ·

2026/02/18

Your thoughts, movements, and moods all depend on chemistry — specifically, the brain’s breathtakingly precise neurotransmitter systems. In this episode, we dive into the molecules that make neurons talk, and the elegant machinery that keeps those conversations going.We’ll revisit the pioneers of neurochemistry, from Otto Loewi, who discovered acetylcholine and proved that neurons communicate with chemicals, to Henry Dale, who gave us the language we still use today — cholinergic, noradrenergic,

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00:38:59

Inside the Chemical Machine: How Neurotransmitters...

Cellular and Molecular Biology for Research ·

2026/02/15

Your thoughts, movements, and moods all depend on chemistry — specifically, the brain’s breathtakingly precise neurotransmitter systems. In this episode, we dive into the molecules that make neurons talk, and the elegant machinery that keeps those conversations going.We’ll revisit the pioneers of neurochemistry, from Otto Loewi, who discovered acetylcholine and proved that neurons communicate with chemicals, to Henry Dale, who gave us the language we still use today — cholinergic, noradrenergic,

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00:43:32

The Synapse Unlocked: From Thumbtacks to Thought: The...

Cellular and Molecular Biology for Research ·

2026/02/11

We’ve seen how a thumbtack to the foot can trigger an electrical storm in your nerves — but how does that signal jump from one neuron to the next? Welcome to the synapse, the tiny but mighty junction where information changes hands.In this episode, we trace the story from the late 1800s, when scientists first realized neurons don’t just touch — they communicate. Early researchers like Charles Sherrington gave this mysterious meeting point a name, while others debated whether neurons talked through

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00:49:42

None Switch: Unpacking the Action Potential (Section 1)

Cellular and Molecular Biology for Research ·

2026/02/08

Your brain speaks in electricity — tiny, rapid bursts called action potentials. In this episode, we break down the signal that carries information through your nervous system at lightning speed. Normally, a neuron’s interior is slightly negative compared to the outside — but when an action potential hits, that balance flips in a split second, and the inside becomes positive.This brief electrical surge, also known as a spike or nerve impulse, races along the axon without losing strength. Every

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00:41:37

The Biological Battery: How Your Brain's Pumps and...

Cellular and Molecular Biology for Research ·

2026/02/04

Ever wonder what’s happening inside your body when you step on a thumbtack and instantly yank your foot away? In this episode, we dive into the electrifying world of your nervous system — literally. From the first spark of pain at your skin to the lightning-fast signals racing up your spinal cord, we unpack how neurons collect, process, and transmit information.You’ll learn how the brain’s communication lines — neurons — send signals not through copper wires, but through charged atoms called ions,

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01:01:47

From Skull Guesswork to Synaptic Gaps: The Epic...

Cellular and Molecular Biology for Research ·

2026/02/01

The historical foundations of neuroscience were laid by numerous individuals over many generations. Today, researchers at various levels of analysis and employing diverse technologies are making significant strides in uncovering the brain's functions. The results of these endeavors form the basis of this textbook. The primary aim of neuroscience is to comprehend how nervous systems operate. Valuable insights can often be gained from observing the brain’s activity indirectly. Since behavior reflects

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00:59:56

Genomics II: Functional Genomics, Proteomics, and...

Cellular and Molecular Biology for Research ·

2026/01/28

Functional genomics focuses on analyzing the expression of numerous genes. One branch of this field is transcriptomics, which examines transcriptomes—all the RNA transcripts produced by an organism at a specific time. A common approach in transcriptomics involves the creation of DNA microarrays or microchips containing thousands of cDNAs or oligonucleotides. These arrays are hybridized with labeled RNAs (or their corresponding cDNAs) from cells, and the hybridization intensity at each spot indicates

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00:51:11

Introduction to Genomics: DNA Sequencing on a Genomic...

Cellular and Molecular Biology for Research ·

2026/01/23

Several approaches are available for identifying genes within a large, unsequenced DNA region. One method is the exon trap, which employs a specialized vector to selectively clone exons. Another involves using methylation-sensitive restriction enzymes to locate CpG islands—DNA regions containing unmethylated CpG sequences. Prior to the genomics era, geneticists mapped the Huntington disease gene (HD) to a region near the end of chromosome 4, subsequently using an exon trap to identify the gene

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00:35:12

Transposition (CMB part 21)

Cellular and Molecular Biology for Research ·

2026/01/20

Transposable elements, also known as transposons, are DNA segments capable of moving from one location to another within the genome. Some transposable elements replicate during the process, leaving one copy in the original position and inserting a new copy at a different site, while others move without replication, vacating the original site entirely. Bacterial transposons can be categorized as follows: (1) insertion sequences, such as IS1, which consist solely of the genes required for

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00:27:02

Homologous Recombination (CMB part 20)

Cellular and Molecular Biology for Research ·

2026/01/15

Homologous recombination is vital for life. In eukaryotic meiosis, it ensures proper separation of homologous chromosomes by locking them together and promotes genetic diversity in offspring by scrambling parental genes. In all life forms, it plays a crucial role in managing DNA damage. In E. coli, homologous recombination via the RecBCD pathway starts with the invasion of duplex DNA by single-stranded DNA from another duplex that has undergone a double-stranded break. This process begins with

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00:40:47

DNA Replication II: Detailed Mechanism (CMB part 19)

Cellular and Molecular Biology for Research ·

2026/01/12

Primer synthesis in E. coli involves the primosome, which consists of the DNA helicase DnaB and the primase DnaG. The assembly of the primosome at the origin of replication, oriC, proceeds as follows: DnaA binds to oriC at specific sites known as dnaA boxes and collaborates with RNA polymerase and HU protein to melt a DNA region adjacent to the leftmost dnaA box. Subsequently, DnaB associates with the open complex and promotes the binding of the primase to complete the primosome. The primosome

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01:02:04

DNA Replication, Damage, and Repair (CMB part 18)

Cellular and Molecular Biology for Research ·

2026/01/08

Several principles govern DNA replication across most organisms: (1) Double-stranded DNA replicates in a semiconservative manner, where the parental strands separate and serve as templates for the synthesis of new, complementary strands. (2) DNA replication in E. coli and other organisms is at least semidiscontinuous. One strand, often considered to replicate continuously in the direction of the replication fork's movement, may actually replicate discontinuously. The other strand replicates

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00:44:12

Ribosomes and Transfer RNA (CMB part 17)

Cellular and Molecular Biology for Research ·

2026/01/04

X-ray crystallography studies on bacterial ribosomes with and without tRNAs have revealed that tRNAs occupy the cleft between the two subunits. They interact with the 30S subunit through their anticodon ends and with the 50S subunit through their acceptor stems. The binding sites for tRNAs primarily consist of rRNA. The anticodons of tRNAs in the A and P sites come into close proximity, allowing base-pairing with adjacent codons in the mRNA bound to the 30S subunit, as the mRNA bends 45 degrees

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00:38:27

The Mechanism of Translation II (CMB part 16)

Cellular and Molecular Biology for Research ·

2025/12/28

Messenger RNAs are read in the 5' to 3' direction, which is the same direction in which are synthesized. Proteins are synthesized from the amino terminus to the carboxyl terminus, meaning the amino-terminal amino acid is added first. The genetic code consists of three-base sequences called codons in mRNA, which instruct the ribosome to incorporate specific amino acids into a polypeptide. The code nonoverlapping, meaning each base is part of only one codon, and it lacks gaps or commas, with every

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01:35:09

The Mechanism of Translation I: Initiation (CMB part 15)

Cellular and Molecular Biology for Research ·

2025/12/24

Two critical events precede protein synthesis. First, aminoacyl-tRNA synthetases attach amino acids to their respective tRNAs with high specificity through a two-step reaction that begins with the activation of the amino acid using AMP, derived from ATP. Second, ribosomes must dissociate into their subunits at the conclusion of each translation cycle. In bacteria, this dissociation is actively facilitated by RRF and EF-G, while IF3 binds to the free 30S subunit, preventing its reassociation with the

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00:59:56

Other RNA Processing Events and Post-Transcriptional...

Cellular and Molecular Biology for Research ·

2025/12/21

Ribosomal RNAs are synthesized in the nucleoli of eukaryotic cells as precursors that require processing to yield mature rRNAs. The sequence of RNAs in the precursor is universally 18S, 5.8S, and 28S across all eukaryotes, although the precise sizes of the mature rRNAs differ among species. In human cells, the precursor is 45S, which undergoes a processing scheme that produces 41S, 32S, and 20S intermediates, with snoRNAs playing crucial roles in these steps. Extra nucleotides are removed from the

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01:26:08

RNA Processing II: Capping and Polyadenylation (CMB...

Cellular and Molecular Biology for Research ·

2025/12/17

Capping occurs in several steps: initially, RNA triphosphatase removes the terminal phosphate from pre-mRNA. Subsequently, guanylyl transferase adds the capping GMP derived from GTP, followed by two methyl transferases that methylate the N7 position of the capping guanosine and the 2'-O-methyl group of the penultimate nucleotide. These processes take place early in transcription, before the RNA chain exceeds 30 nucleotides in length. The cap plays a crucial role in ensuring proper splicing of some

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