DNA:Molecular Biology at its

Finest

Objectives1. Describe the scientific processes that led to the conclusions that DNA is the genetic material

and that it is a double helix and defend or judge the actions of researchers involved. (Knowledge, Reasoning - Content Standards A2, F1, G1-G4)

2. List and recognize the basic parts of DNA and be able to fit them together to form the overall structure of DNA. (Knowledge, Skill - Content Standard C2)

3. Compare and contrast DNA, mRNA, and tRNA in terms of their structures, functions, and locations. (Knowledge - Content Standard C2)

4. Describe in detail how DNA makes you you through transcription and translation, and what other factors make you who you are. (Knowledge, Reasoning - Content Standards C1, C2, E1, E3, F1, Cultural Standard E8)

5. Replicate, transcribe, and translate a DNA sequence to determine the sequences of complementary DNA, mRNA, and tRNA+amino acids it will produce. (Skill - Content Standard C2)

6. Differentiate between structure and function of DNA in chromosomes and that of DNA in chromatin. (Knowledge - Content Standard C2)

7. Compare and contrast mutations in body cells vs sex cells and frameshift mutations vs point mutations in terms of heritability & severity of consequences. (Knowledge, Reasoning - Content Standards C1, C2)

8. Evaluate the medical, social, and everyday implications of DNA research in general and RNAi research in particular. (Reasoning - Content Standards E1, E3, Cultural Standard B4)

#9. Be able to link gene expression to the existence of different tissues in the same organism.

Essential Questions• Why did scientists want to figure out

the shape of DNA so much? Who got the credit for doing it? Why?

• All living things have the same genetic material. Is this true, false, or both? How?

• How does DNA make you you? What else makes you you?

VocabularyStructure

DNA, mRNAnucleotides – sugars: ribose,

deoxyribose; phosphoric acid; nitrogenous base

complementary pairshydrogen bondscodons

tRNAanti-codons

Amino acidsProteins

FunctionHeredity-DNA replication

Protein Synthesis-transcription-translation

Incidental or review:ComplementaryRungsDouble Helix Nucleic Acid, ProteinNucleus, Ribosome

Feb 15•Debrief Pre-TestAnticipatory Set:

•Quick Fruit DNA Extraction, BBC awesomeness (DNA unraveling clip)

Instruction:

•Mighty Morphin’ DNA Notes•Pre-lab InstructionsIndependent Work:

•DNA ExtractionClosure:

•Discussion: why worked, why didn’t?

Learning LogNo learning log today!

Obj. #6

•DNA during Mitosis (cell division): –In chromosome form–Tightly coiled around protein beads–inactive (no space to work!)

•DNA during Interphase (cell just hangin’ out):–It’s in chromatin form–All strung out - more disorganized!–Active – replicating, transcribing

(has space to work!)

Mighty Morphing DNA!

Obj. #6

•YOU are going to extract your own DNA

•Any old cell will do. . . Any guesses on what cells of yours we’re going to use?

•What will the DNA look like?

DNA Extraction

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•What will your DNA look like? Remember the onion root tips?

Will it look like those chromosomes?

DNA Extraction

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•What will the DNA look like? THIS:

(except you’ll be taking it out of a test tube)Is this chromatin or chromosomes d’you think?

DNA Extraction

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•YOUR DNA WILL LOOK LIKE THIS:

(if you’re lucky)How do we get it out of the cells and looking like that?

DNA Extraction

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•How to do it:–Open up notebook–Write title–Write purpose: to see DNA in chromatin form firsthand and practice wet lab techniques! –Write procedures, list equipment, then DO IT:

1. Add 5mL detergent to test tube 12. Swish with salt water (1 minute!)3. Spit into cup4. Add detergent + spit to test tube5. GENTLY cap tube and rock 3 min

–DISCUSS WHY IT WORKED OR DIDN’T AND ANSWER QUESTIONS (next slide)

DNA Extraction

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6. SLOW: Add tube 1 to ethanol in tube 2

7. Let stand 2 min, observe

8. Capture DNA by twirling glass rod

9. FYI: WRITE DOWN OBSERVATIONS

•QUESTIONS:1. Was the DNA you saw in chromosome or chromatin form? Inactive

or active? Orderly or chaotic?2. How did the detergent help us free the

DNA from the cells?3. How did the ethanol help us separate the

DNA from the other stuff?4. How does your DNA compare to a fruit’s?

DNA Extraction

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Feb 16 p.5

Feb 17 p.6•LL DiscussionAnticipatory Set:

•The History of DNA in Under 2 MinutesAssignment:

•Research the History of DNA •Present FindingsClosure/Instruction/Informal Assessment:

•Transparencies (experiment illustrations)

Turn in notebooks, open to extraction lab

Sketch, label chromosome or chromatin, & tell how you know.

a. b.

c. d.

Obj. #1

Learning Log

Learning Log •LL, Pick up NB’sAnticipatory Set:

•Movie Prologue•Discuss Movie ResponseAssignment:

•Watch “The Secret of Photo 51” Closure/Assessment:

•Discuss and Write Response(Homework)

Tell what the illustration below discovered and explain how.

Feb 17 p.5 Feb 18 p.6

Obj. #1

•In-movie questions:–Why would anyone want to know DNA’s structure?–How did Watson and Crick figure it out?–Who else contributed to the discovery? How?

•Response: Write one sentence to sum up the movie, then give your impressions of each of the researchers. Explain their attitudes and actions, and evaluate how scientifically rigorous, ethical, and successful each of them were. Defend your evaluations.

The Secret of Photo 51

Obj. #1

Learning Log Match the scientists with their accomplishments by

writing one sentence about each.

LL DiscussionResponse Due (Debrief)Anticipatory Set:

• DNA Pieces PuzzleAssignment:

• DNA Struc & Rep. Notes

• Create DNA & RNA Pieces, start DNA/RNA Packet - read, answer questions

- stop at stars to show models

Chargaff Hershey &

Chase Ros. Franklin Watson & Crick

Feb 19

- built the double-helix model.

- produced x-ray image of DNA.

- tracked radioactive DNA from virus to bacteria.

- discovered that A=T, G=C.

Obj. #1, 2

Feb 22LL Discussion

•DNA Replication Video

•Continue DNA & RNA Packet Create DNA & RNA Pieces

- read, answer questions - stop at stars to show

models -finish part B by today

Each DNA nucleotide is made up of three molecules: 1 ________, 1 ________, and 1 _________.

Different kinds of nucleotides have different _________.

The four different bases are ___, ____, ____, and ____.

In DNA, Adenine matches up with _______ and Guanine matches up with _______.

Learning LogObj. #2

Feb 23 p.5

Feb 24 p.6

•LL

•Transcription Translation Video (up to 1:30)

•Transcription Notes•FINISH DNA & RNA Packet•Review Packet/ Self-Assess•Cracking the Code (if time)

Tell three similarities and three differences between DNA and RNA.

Learning Log

Obj. #3

Feb 24Feb 25

•LL Discussion•Transcription Translation Video •mRNA to Protein/ Translation/ Protein Synthesis Notes•Begin tRNA/ Protein Packet

The “m” in mRNA stands for ________ because mRNA carries the code out of the__________ to the __________ where proteins are made.

TURN IN FEBRUARY CALENDARS!

Learning LogObj. #4

March 1•LL Discussion•Doggy DNA vid•Continue Translation PacketMissing work?Feb Calendars dueTAKE MITOSIS TEST P.5: James, Shaquille, Brandon, & Jesus

P.6: Danni, Douane, & Cindy

Learning Log•What is the process of decoding an mRNA strand into a protein called? (write 1 sentence to answer)

Obj. #4

Mar 2 p.5Mar 3 p.6

•LL Discussion•Finish Translation Packet•Review Packet•RNAi movie (15 min)

•RNAi discussion

Feb Calendars?TAKE MITOSIS TEST:

P.5: James, Shaquille P.6: Douane & Cindy

Learning LogDNA sequence:

ATA GCT•mRNA sequence:

_ _ _ _ _ _•tRNA sequence:

_ _ _ _ _ _•Amino acid sequence:

______, ______

Obj. #4

•In-movie questions:–What do the castle, the scribe, the ocean, the cook, the food, the robber, and the cop represent?– What does RNAi do naturally?–How can we use RNAi?

•Discussion: What kind of world would it be if we could switch on and off any genes we want using RNAi? Awesome? Scary? Both? Why? How much do our genes determine who we are?

RNAi

Obj. #1

Mar 3 p.5Mar 4 p.6•LL Discussion•RNAi movie debrief

•The Secret Message•Test study guide (HW)Missing work?Feb Calendars?TAKE MITOSIS TEST:

P.5: James, Shaquille P.6: Douane, Cindy

Learning LogIn mRNA, three nucleotides in a row is called a __________. In tRNA, three nucleotides in a row is an __________.

Sketch a tRNA molecule and label it tRNA.

Obj. #4, 8

•Transcriber: go to nucleus, transcribe DNA nucleotide sequence to mRNA sequence, leave nucleus, go to ribosome (in cytoplasm)•Translator: translate mRNA codons into tRNA anti-codons, turn over correct anti-codon cards for corresponding amino acids/words•Both: construct protein (sentence), check for mistakes in the sentence (aka mutations in the protein).

The Secret Message

March 15•LL Discussion•Gene Machine•DNA Practice Quiz - DNA & Genes - Translation

Learning LogObj. #6

•What does DNA and RNA have to do with your everyday life? Your future? Your past? Your society?

Mar 15, per. 5

Mar 16, per 6•Mutations!

–Mutation Notes–Mutation Mystery

Next time:–Test!–Notebooks due

Learning LogWhat is the basic name for mistakes in copying DNA? What do you think USUALLY happens when these mistakes occur?

Obj. #7

•Mutation: a change in the sequence of DNA nucleotides (A, G, C, & T)•What happens to mutations?

–Usually, immediate repair–Coolness: p53 gene, “angel of the chromosome”

MutationsObj. #7

•Two types of cells in your body:

–sex cells - sperm and egg cells; used in reproduction–body cells - non-reproductive cells; have other functions

MutationsObj. #7,9

2 types of cells in your body = 2 different places mutations can happen

Mutations

Sex cell mutations-get passed on (good or bad?)-can be severe -embryo may die

Body cell mutations-not passed on-cell can lose function-if mutations build up or increase cell division? _______

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2 different kinds of mistakes = 2 different kinds of mutations

Point mutations vs

Frameshift mutations

MutationsObj. #7

Point mutations - change in single base pair; only ONE spot in sequence changed

Ex:THE FAT CAT ATE THE RATbecomes

THE FAT BAT ATE THE RAT

MutationsObj. #7

Frameshift mutations - addition or deletion of a single base pair

Ex: THE FAT CAT ATE THE RATBecomes

THE ATC ATA TET HER AT?

Is a point mutation or frameshift worse?

MutationsObj. #7

Mar 16Mar 17

•DNA Test!

Learning LogNo Learning Log

Got a notecard?Got your notebook?

Got your brain?Good!

Why are different cells in your body so different if they all have the same DNA in them?

Gene ExpressionObj. #9

Brain cells Liver cells

Why are different cells in your body different if they all have the same DNA in them?

Gene ExpressionObj. #9

Answer? Differential gene expression.

Remember how iRNA could “shut off” certain genes?

Your different cells do that all the time – they only use PART of the instructions

(DNA) they have.