Name: dna replication teams in the replisome
Uploaded: 2020-11-23T11:47:35.000Z
Duration: 3 min 1 s
Channel: JoVE

K12 Standards

Alabama Course of Study Science

9-12

Biology

from-molecules-to-organisms-structures-and-processes

From Molecules to Organisms: Structures and Processes

9-12.B.1.3

The Replisome

DNA 복제는 DNA 복제 기계 또는 리플리솜(replisome)으로 알려진 고도로 조정된 다중 단백질 어셈블리에 의해 수행되며, 이는 DNA 복제의 효율성을 높입니다.
이 기계의 핵심 구성 요소는 헬리카제(helicase), 단일 가닥 DNA 결합 단백질(single-strand DNA binding protein), DNA 프리마제(DNA primase), 슬라이딩 클램프(sliding clamp), 클램프 로더(clamp loader) 및 다중 DNA 중합효소(multiple DNA polymerase)이며, 이들은 모두 복제 포크 근처에서 서로 연결되어 있습니다.
복제 DNA 중합효소는 약 10개의 뉴클레오티드의 진행도를 가지며, 이는 템플릿 가닥에서 해리되기 전에 딸 가닥에 추가할 수 있는 뉴클레오티드의 수입니다. 
이것은 합리적인 시간 내에 전체 게놈을 복사하는 데 너무 비효율적이며 이 문제는 슬라이딩 클램프 단백질의 도움으로 해결됩니다.
ATP가 클램프 로더 단백질과 결합할 때, 이 단백질은 슬라이딩 클램프에 결합하고 이를 열어 고리 모양의 구조가 프라이머-템플릿 DNA 복합체를 둘러쌀 수 있도록 합니다. 일단 결합되면, 클램프 로더는 ATP를 ADP로 가수분해하여 클램프 로더가 분리되고 클램프가 DNA 주위에서 닫히게 합니다.
그런 다음 DNA 중합효소는 클램프 단백질에 결합하고 함께 주형 DNA를 따라 미끄러지면서 DNA 중합효소를 가닥에 묶고 진행도를 최대 1000개의 뉴클레오티드까지 증가시킵니다. 
이렇게 증가된 진행도를 통해 DNA 중합효소는 선행 가닥에서 연속적인 DNA 복제를 수행할 수 있습니다.
그러나 지연 가닥 주형에서 다른 DNA 중합효소는 DNA 중합효소 분자가 선행 가닥과 지연 가닥을 동시에 합성할 수 있도록 하는 방식으로 불연속 DNA 복제를 수행합니다. 이 과정은 때때로 "트롬본 모델"로 설명됩니다.
지연된 가닥과 그 주형 가닥은 DNA 중합효소가 RNA 프라이머에서 오카자키 단편 합성을 시작할 때 루프를 형성합니다. 
DNA 루프는 헬리카제가 DNA를 풀고 지연 가닥이 합성됨에 따라 양방향에서 성장합니다.
DNA 중합효소가 다음 RNA 프라이머를 만나면 템플릿 가닥에서 분리됩니다.한편, primase는 지연 가닥에 또 다른 프라이머를 추가하고 성장하는 DNA 루프가 해제됩니다. 
클램프 및 클램프 로더 단백질을 사용하면 DNA 중합효소가 프라이밍된 DNA 템플릿과 빠르게 재결합할 수 있습니다.
DNA 루프의 형성 및 부분 서열 붕괴는 각각의 새로운 오카자키 단편의 합성과 함께 반복됩니다.

<ol>
	<li>오도넬, 마이클, 랜스 랭스턴, 브루스 스틸먼. "박테리아, 고세균 및 진핵 생물에서 DNA 복제의 원리와 개념." Cold Spring Harbor Perspectives in Biology 5, no. 7 (2013): a010108.</li>
	<li>앨버트, 브루스. "DNA 복제 및 재조합." Nature 421, no. 6921 (2003): 431.</li>
	<li>켈치, 브라이언 A., 데보라 L. 마키노, 마이크 오도넬, 존 쿠리얀. "클램프 로더 ATPase와 DNA 복제 기계의 진화." BMC 생물학 10, no. 1 (2012): 34.</li>
	<li>Hedglin, Mark, Ravindra Kumar 및 Stephen J. Benkovic. "복제 클램프 및 클램프 로더." Cold Spring Harbor Perspectives in Biology 5, no. 4 (2013): a010165.</li>
	<li>가드너, 앤드류 F., 즈비 켈먼. "치료 표적으로서의 DNA 복제 기계." 분자 생명과학 프론티어 6(2019): 35.</li>
</ol>

레플리솜

DNA 복제는 높은 정확도의 DNA 복제를 달성하기 위해 조화롭게 작용하는 단백질들의 대규모 복합체에 의해 수행됩니다. 이 복합체는 DNA 복제 기계 또는 리플리솜으로 알려져 있습니다.

선도 가닥과 지연 가닥의 합성은 고도로 조화된 과정입니다. 이를 설명하기 위해 1980년 브루스 앨버트가 "트롬본 모델"을 제안했습니다. DNA 루프 형성은 모 지연 가닥에서 프라이머가 합성될 때 시작됩니다. 루프는 Okazaki 단편의 합성과 함께 성장하고 단편 합성이 끝나면 최종적으로 용해됩니다. 그런 다음 DNA 중합효소는 다른 프라이머에 부착되고 루프 형성부터 붕괴까지 전체 주기가 반복됩니다. 레플리솜을 사용하면 모든 활동을 복제 기계 복합체로 조정할 수 있습니다.

레플리솜 구성요소

헬리카제는 이중 가닥 DNA를 풀고 분리합니다. 이 효소는 원핵생물에서는 단일 6량체 고리로, 진핵생물에서는 이중 6량체 고리로 존재합니다. 진핵생물 헬리카제는 기능을 위해 추가 단백질인 Cdc45 및 GINS에 의존합니다. 단일 가닥 DNA 결합(SSB) 단백질은 DNA 가닥이 재어닐링되는 것을 방지합니다. 원핵생물에서 SSB는 단일 소단위체로 구성되는 반면, 진핵생물에서는 복제 단백질 A(RPA)로 알려진 이종 삼량체 단백질입니다.

프리마제는 DNA 합성이 시작되는 곳에 RNA 프라이머를 추가합니다. 원핵생물에서 프리마제는 약 12개의 뉴클레오티드로 구성된 RNA 프라이머를 합성하는 DnaG라는 단일 소단위체 효소로 존재합니다. 진핵생물에서는 다중소단위 효소인 DNA 폴리머라제-α 프리마제가 약 25개 뉴클레오티드로 구성된 RNA-DNA 하이브리드 프라이머를 합성합니다. 중합효소-α 외에도 복제 중합효소는 새로 합성된 DNA를 확장합니다. 단일 유형의 복제 중합효소인 DNA 중합효소 III이 원핵생물에 존재하는 반면, 두 가지 다른 유형의 복제 중합효소인 Pol ε 및 Pol δ가 진핵생물에 존재하여 각각 선두 가닥과 지연 가닥 합성을 수행합니다.

슬라이딩 클램프 단백질은 중합효소가 DNA 주형에 부착된 상태를 유지합니다. 동종이량체 단백질인 β-클램프는 원핵생물에서 클램프 역할을 합니다. 진핵생물에서는 동종삼량체 단백질인 세포핵항원(PCNA)을 증식시켜 동일한 작업을 수행합니다. 슬라이딩 클램프의 중앙 기공은 양전하를 띠고 있어 음전하를 띤 DNA의 인산염 백본과 정전기적 상호 작용을 할 수 있습니다. 클램프는 클램프 로더에 의해 DNA에 부착됩니다. 이러한 오량체 단백질은 AAA+ 클래스의 ATPase에 속합니다. 진핵생물 클램프 로더는 복제 인자 C로 알려져 있고, 원핵생물 대장균 클램프 로더는 γ 복합체로 알려져 있습니다. 그러나 클램프 단백질과 클램프 로더는 레플리솜의 다른 많은 구성 요소와는 달리 진화적 상동체로 생각됩니다.

DNA 복제는 고충실도 DNA 복제를 달성하기 위해 조정된 물질에서 작용하는 대규모 단백질 복합체에 의해 수행됩니다. 함께 이것 ...

Education

교육

JoVE Core

Molecular Biology

분자생물학

Unit 1

제1단원

DNA Replication

DNA 복제

KEY TERMS AND CONCEPTS

주요 용어 및 개념

dna replication teams in the replisome

DNA replication depends on the replisome, a coordinated complex of proteins that copies DNA with high accuracy. This DNA replication machinery brings many parts together so the leading and lagging strands can be made at the same time.

A key idea in this process is the trombone model, proposed by Bruce Alberts in 1980. In this model, a loop forms on the lagging strand when a primer is made. The loop grows as an Okazaki fragment is synthesized, then falls apart when that fragment is finished. DNA polymerase then moves to a new primer, and the cycle repeats.

Helicases start the process by unwinding and separating double-stranded DNA. In prokaryotes, helicase is a single hexamer ring, while in eukaryotes it forms a double hexamer ring. Eukaryotic helicases also need the extra proteins Cdc45 and GINS to work. Single-stranded DNA binding proteins keep the separated strands from reannealing. In prokaryotes, these are SSB proteins with one subunit. In eukaryotes, the equivalent protein is replication protein A, or RPA, which is a heterotrimer.

Primase adds the RNA primer that gives DNA synthesis a starting point. In prokaryotes, primase is the single-subunit enzyme DnaG, and it makes an RNA primer of about 12 nucleotides. In eukaryotes, DNA polymerase-alpha primase makes an RNA-DNA hybrid primer of about 25 nucleotides. After that, the replicative polymerase extends the new DNA strand. Prokaryotes use DNA polymerase III, while eukaryotes use Pol epsilon for the leading strand and Pol delta for the lagging strand.

Sliding clamp proteins hold the polymerases on the DNA template so copying can continue efficiently. The prokaryotic beta-clamp is a homodimer, and the eukaryotic clamp is proliferating cell nuclear antigen, or PCNA, which is a homotrimer. The clamp has a positively charged central pore that interacts with the negatively charged DNA backbone. A clamp loader places the clamp onto DNA. These pentameric AAA+ ATPases include the eukaryotic replication factor C and the E. coli gamma complex. The clamp proteins and clamp loaders are thought to be evolutionary homologs, unlike many other replisome components.

DNA Replication Teams in the Replisome

replication in prokaryotes

Prokaryotic DNA Replication Steps

Prokaryotic DNA replication copies the chromosome before a cell divides. In bacteria, this process starts at a specific DNA site called the origin of replication. From there, the cell builds new DNA strands using enzymes that match each base with its partner. The DNA double helix first opens so replication can begin. As the strands separate, each original strand serves as a template. New nucleotides are added in a set order, which helps the cell make an accurate copy of its genetic material. <br...

replication in eukaryotes

Eukaryotic DNA Replication Steps

Eukaryotic DNA replication copies the genome before a cell divides. In eukaryotes, this process happens in a controlled sequence so each new cell can receive genetic information. Replication begins at specific sites on the DNA called origins. The DNA is opened, and each original strand serves as a template, meaning it guides the building of a new complementary strand. This sets up two DNA molecules from one original molecule. The process then continues as enzymes add matching nucleotides to...

dna base pairing

DNA Base Pair Rules

DNA base pairing follows specific rules that help DNA carry genetic information. In DNA, the bases pair in a regular way, with adenine matching thymine and cytosine matching guanine. These pairs fit together because of their chemical shapes and bonding patterns. These base pairs also support accurate DNA replication. When DNA copies itself, each strand can guide the formation of a new partner strand using the pairing rules. Understanding base pairing helps explain how DNA stays organized and...

the dna replication fork

DNA Replication Stress and Fork Stalling

DNA replication stress and fork stalling can disrupt the copying of a cell’s genome. The replication fork is the Y-shaped site where DNA strands separate and new complementary strands are made at the same time. This linked unwinding and synthesis helps cells duplicate DNA efficiently and with fewer errors. In organisms with small circular DNA, such as E. coli, replication often begins at a single origin. That setup creates two replication forks that move in opposite directions from the opening...

proofreading

Proofreading in DNA Replication

Proofreading in DNA replication helps keep DNA copying accurate. It is a built-in check that reduces mistakes as new DNA is made. DNA polymerase is the enzyme that carries out this checking during replication. When it adds a wrong nucleotide, it can remove the error and replace it with the correct one. This correction step helps maintain the correct DNA sequence. Proofreading is an important part of DNA replication because it supports genetic accuracy. By catching mistakes as they happen, the...

dna helicases

Helicase Motor Proteins in DNA Unwinding

Helicase motor proteins help unwind DNA during key cell processes. They use energy from ATP hydrolysis, which is the breakdown of ATP to release usable energy. This movement lets helicases separate DNA strands when the cell needs access to the genetic code. These enzymes are involved in DNA replication, repair, recombination, and transcription. Helicases are found in all living organisms, but their structure, function, and movement can differ. In prokaryotes, the DnaB helicase moves along the...

the replisome

DNA replication depends on the replisome, a coordinated complex of proteins that copies DNA with high accuracy. This DNA replication machinery brings many parts together so the leading and lagging strands can be made at the same time. A key idea in this process is the trombone model, proposed by Bruce Alberts in 1980. In this model, a loop forms on the lagging strand when a primer is made. The loop grows as an Okazaki fragment is synthesized, then falls apart when that fragment is finished.

lagging strand synthesis

Okazaki Fragments in DNA Replication

DNA replication uses a leading strand and a lagging strand, and they are made at different rates. The leading strand starts first. The lagging strand starts later, moves more slowly, and is made in pieces. The two strands also differ in direction and starting steps. Leading strand synthesis follows the opening replication fork. Lagging strand synthesis goes in the opposite direction. The leading strand needs one RNA primer, while the lagging strand needs multiple RNA primers. After priming,...

mismatch repair

Fixing DNA Copying Errors

Mismatch repair helps fix DNA copying errors after replication. When DNA is copied, small mistakes can slip through. This repair system finds those mismatches and corrects them before they become permanent changes. The process depends on a group of mutator proteins. These proteins work together to detect the error, remove the incorrect section, and help replace it with the proper DNA sequence. In this way, mismatch repair supports the accuracy of genetic information. If the repair system does...

dna topoisomerases

How Topoisomerases Untwist DNA

DNA topoisomerases are enzymes that untwist DNA when it becomes overcoiled during cell processes such as DNA replication and transcription. They help regulate positive and negative DNA supercoiling without changing the nucleotide sequence. Clockwise overwinding creates positively supercoiled DNA, while counterclockwise underwinding produces negatively supercoiled DNA. Topoisomerases are grouped into two main types. Type I topoisomerases act on one strand of double-stranded DNA, and they...

telomeres and telomerase

How Telomerase Protects Chromosome Ends

Telomerase helps protect chromosome ends during eukaryotic DNA replication. When the final primer is removed, a single-stranded DNA fragment can remain at the end of the chromosome. That piece cannot be copied in the same way as the rest of the strand because there is no 3' end for new DNA to attach to. If this end piece is not replaced, chromosomal DNA is gradually lost each time a cell divides. The exposed single-stranded DNA can also trigger a DNA damage response from enzymes that detect it.

non-nuclear inheritance

Cytoplasmic Inheritance in Cells

Cytoplasmic inheritance explains how some traits are passed through cell structures outside the nucleus. These traits come from organelles such as mitochondria and chloroplasts. They do not follow the usual nuclear pattern of inheritance. Mitochondria and chloroplasts each contain their own DNA. Because of this, they can carry genetic information that affects cell function and certain visible traits. In high school biology, this topic helps explain why not all inherited traits come from...

animal mitochondrial genetics

Animal Mitochondrial DNA and Inheritance

Animal mitochondrial DNA has its own genome, separate from nuclear DNA. It is a double-stranded, closed circular molecule with about 20,000 base pairs. One strand is the heavy, or H-strand, because it is rich in guanine. The other is the light, or L-strand, because it is rich in cytosine. Compared with nuclear DNA, mitochondrial DNA has very little non-coding sequence. It also has no introns. Its genes are packed closely together, and some even overlap. The D-loop is the main non-coding...

comparing mitochondrial, chloroplast, and prokaryotic genomes

comparing-mitochondrial-chloroplast-and-prokaryotic-genomes

How Organelle Genomes Resemble Bacteria

Mitochondrial and chloroplast genomes still keep several traits from their bacterial ancestors. They also show changes that happened after these organelles evolved inside eukaryotic cells. Eukaryotic cells are cells with a nucleus, while prokaryotes are cells without one. Like prokaryotic genomes, mitochondrial and chloroplast genomes do not bind with histone-like proteins. They also do not show the complex chromosome-like packaging seen in eukaryotes. Mitochondria and chloroplasts divide by...

export of mitochondrial and chloroplast genes

export-of-mitochondrial-and-chloroplast-genes

How Organelles Pass Genes to the Nucleus

Eukaryotic cells can carry three genetic systems: nuclear, mitochondrial, and chloroplast. Over time, many genes from mitochondria and chloroplasts have moved into the nucleus. In some plant species, this gene transfer is still happening. This movement has affected large parts of the genome in some organisms. About 18% of the Arabidopsis thaliana nuclear genome is thought to come from the chloroplast's cyanobacterial ancestor. In yeast, around 75% of the genome is derived from the...

single-strand dna binding proteins

How SSB Proteins Protect DNA Strands

Single-strand DNA-binding proteins, or SSB proteins, help protect DNA during replication. When double-stranded DNA is unwound, the two strands separate. SSB proteins bind to the exposed single strands and keep them stable. These proteins bind in a sequence-independent manner. That means the order of the nitrogenous bases does not have to follow a specific pattern for SSB proteins to attach. Their binding straightens single-stranded DNA and makes it more rigid. This support may help DNA...

key terms and concepts

Explore how the replisome coordinates DNA replication, from helicase and primase to polymerases, sliding clamps, and the trombone model.

DNA Replication Teams in the Replisome | JoVE K12

molecular biology

JoVE Core 분자생물학은 명확하고 간결한 애니메이션을 통해 분자 단계에서 일어나는 세포 과정을 설명합니다.또한, 과학자가 직접 실험을 진행하는 실사 영상을 통해 분자생물학 개념의 응용 사례를 보여줍니다.

What are Cells?

Cells are the smallest and basic units of life, whether it is a single cell that forms the entire organism, e.g., in a bacterium or trillions of them, ...

Cell Size

Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (&#x3BC;m)and are considerably smaller than most ...

Eukaryotic Compartmentalization

One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry ...

Prokaryotic Cells

Prokaryotes are small unicellular organisms that include the domains&#x2014;Archaea and Bacteria. Bacteria include many common organisms, such as ...

Cytoplasm

The cytoplasm consists of organelles and a framework of protein scaffolds called the cytoskeleton suspended in an aqueous solution, the cytosol. The ...

The Nucleus

The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression ...

Endoplasmic Reticulum

Endoplasmic ReticulumThe endoplasmic reticulum (ER) is an extensive network of membranous sacs and tubules in eukaryotic cells, continuous with the outer ...

Ribosomes

Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that ...

Golgi Apparatus

As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are ...

Lysosomes

Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules ...

Peroxisomes

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration&#x2014;the ...

Introduction to the Cytoskeleton

Overview of the Cytoskeleton
The cytoskeleton is a network of protein filaments present within the cell, having three distinct filaments ...

Introduction to Actin

Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle ...

overview-of-myosin-structure-and-function

Overview of Myosin Structure and Function

Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with ...

Microtubules

Microtubules are the thickest cytoskeletal filaments with a diameter of 25 nm. In prokaryotic organisms, microtubules are commonly found in locomotory ...

The Structure of Intermediate Filaments

The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of ...

Types of Intermediate Filaments

The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and ...

Gap Junctions

Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between ...

The Extracellular Matrix

In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, ...

Tissues

Cells with similar structure and function are grouped into tissues. A group of tissues with a specialized function is called an organ. There are four main ...

Plant Cell Wall

The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For ...

Plasmodesmata

The organs in a multicellular organism&#x2019;s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way ...

pH Regulation in Cells

pH plays a critical role in maintaining normal cellular activities. It helps maintain the structure and function of various proteins, dictates the charge ...

Chemistry of the Cell

Introduction to Cellular Respiration

Organisms harvest energy from food, but this energy cannot be directly used by cells. Cells convert the energy stored in nutrients into a more usable ...

ATP Energy Storage and Release

ATP and Macromolecule Synthesis

Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, ...

1. Engage in evidence-based argument to relate a cell's function to the structure, function, and diversity of its components. Examples: Muscle cells have a large number of mitochondria, which create energy for contraction in the form of ATP. Some plant cells have a large vacuole which is used for storage and transport of excess nutrients in changing environments.

9-12.B.1.1

What is Gene Expression?

A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised&#160; of nucleotides and proteins are ...

RNA Structure

The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form ...

Types of RNA

Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse ...

Transcription

Transcription is the synthesis of RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. ...

Bacterial RNA Polymerase

Eukaryotic RNA Polymerases

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of ...

RNA Polymerase II Accessory Proteins

Transcription Elongation Factors

pre-mrna-processing-modification-of-pre-mrna-ends

Pre-mRNA Processing: Modification of pre-mRNA Ends

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or ...

Pre-mRNA Processing: RNA Splicing

Chromatin Structure and RNA Splicing

Alternative RNA Splicing

Nuclear Export of mRNA

Transfer RNA Synthesis

Ribosomal RNA Synthesis

The Nucleolus

Additional Subnuclear Structures

Translation

Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes ...

tRNA Activation

Initiation of Translation

Termination of Translation

Improving Translational Accuracy

prokaryotic-transcriptional-activators-and-repressors

Prokaryotic Transcriptional Activators and Repressors

Nonsense-mediated mRNA Decay

The Eukaryotic Promoter Region

Molecular Chaperones and Protein Folding

Co-activators and Co-repressors

The Proteasome

Master Transcription Regulators

Regulated Protein Degradation

Regulated mRNA Transport

Proteins: From Genes to Degradation

mRNA Stability and Gene Expression

Cell Specific Gene Expression

MicroRNAs

MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between ...

regulation-of-expression-occurs-at-multiple-steps

Regulation of Expression Occurs at Multiple Steps

Small interfering RNAs (siRNA)

Cis-regulatory Sequences

lncRNA - Long Non-coding RNAs

cooperative-binding-of-transcription-regulators

Cooperative Binding of Transcription Regulators

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. ...

2. Obtain and evaluate information to explain the role of DNA and RNA in transcription and translation leading to protein synthesis and cellular function.

9-12.B.1.2

Nucleic Acids and Nucleotides

Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell&#39;s genetic blueprint and have instructions for its ...

Nucleic Acid Structure

The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group ...

Genomic DNA in Prokaryotes

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the ...

Genomic DNA in Eukaryotes

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the ...

a. Use a model to describe the structure and sequence of DNA, including nucleotide structure, base pairing, and the structure of the helix.

9-12.B.1.2.a

DNA Replication Teams in the Replisome

Description

Transcript

Tags

More videos by Standards