All plants get energy from the sun, but the giant hogweed gets another, dangerous superpower from the sun's light: the ability to burn skin with its sap.

Our understanding of both clogged arteries and the building blocks of DNA are thanks to the groundbreaking work of Dr. Marie M. Daly, the first Black woman in the U.S. to receive a Ph. D. in chemistry.

Hank tells us three surprises about human DNA which we learned because of the Human Genome Project.

There’s more to DNA than just the double helix we know and love: under some conditions this familiar molecule can take on unfamiliar forms, each of which can have a different impact on our health.

Why is RNA just as cool as DNA? Join the Amoeba Sisters as they compare and contrast RNA with DNA and learn why DNA should be sharing the limelight! Table of Contents: 00:00 Intro 0:54 Similarities of DNA and RNA 1:35 Contrasting DNA and...

DNA damage doesn't just happen in the summer, but does that really mean we should wear sunscreen in the cloudy and chilly months?

Paul Andersen explains the importance and structure of nucleic acids. He begins with an introduction to DNA and RNA. He then describes the important parts of a nucleotide and shows how they are connected through covalent and hydrogen...

Hank imagines himself breaking into the Hot Pockets factory to steal their secret recipes and instruction manuals in order to help us understand how the processes known as DNA transcription and translation allow our cells to build proteins.

Paul Andersen describes the molecular structure of DNA. He describes the major parts of a nucleotide and explains how they are assembled into a nucleic acid. The nitrogenous base, deoxyribose sugar and phosphate group make up a single...

Mismatch repair (MMR) is a DNA repair mechanism that corrects base-pairing errors and small insertions or deletions that escape proofreading during DNA replication. A protein complex identifies the mismatch, excises a section of the...

DNA (Deoxyribonucleic acid) carries the genetic instructions for an organism's growth, development, and reproduction, encoded by sequences of four nitrogen bases: adenine (A), thymine (T), guanine (G), and cytosine (C). These bases form...

Pyrosequencing is a DNA sequencing-by-synthesis method that detects light emitted during nucleotide incorporation, offering a faster and more cost-effective alternative to the traditional Sanger method. It uses a cascade of enzymatic...

Maxam–Gilbert sequencing is a method of DNA sequencing developed by Allan Maxam and Walter Gilbert in 1976–1977. This method is based on nucleobase-specific partial chemical modification of DNA and subsequent cleavage of the DNA backbone...

Ultraviolet (UV) light acts as a physical mutagen by inducing pyrimidine dimers, especially thymine dimers, which distort DNA structure and hinder transcription and replication. The damage can be repaired by photo reactivation, a process...

In some cases, a cell can fix DNA damage simply by reversing the chemical reaction that caused it. To understand this, we need to realize that "DNA damage" often just involves an extra group of atoms getting attached to DNA through a...

What is a nucleotide? What is a nucleobase? What is the function of a nucleotide? Nucleotides essentially are the building blocks of DNA and RNA.

In the DNA double helix, the links between the two strands are formed by pairs of much smaller molecules called bases.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning...

A class of large polymer molecules consisting of repeating units called nucleotides.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

An essential stage in cell division and reproduction, allowing genetic material to be copied into a new cell.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images...

How does our DNA make us unique, and how is this unique genetic information passed on when cells divide? Biology - Cells And DNA - Learning Points. Deoxyribonucleic Acid (DNA) molecules are found in chromosomes within all our cells. DNA...

By the end of this learning object, the learner will be able to: Explain the chemical structure of DNA.88055

A video explaining and illustrating all steps of transcription.

Beriberi (Thiamine Deficiency): Wet vs Dry Beriberi, Pathophysiology, Symptoms, Diagnosis, Treatment



Beriberi is a set of two conditions (Wet beriberi and Dry beriberi) that are caused by a deficiency of vitamin B1 (thiamine)....

Genetics | A Comparison of Silent, Mis-sense, & Non-sense Mutations