-- Included in 3.A - Inheritance Package --
This 122-slide teaching PowerPoint presentation covers 3.A.1 (DNA & RNA) in the AP Biology (2015) curriculum. Each slide includes the 'Essential Knowledge' being covered as well as key terms that students should make note of (editable).
This unit has been divided into six sections:
1 - Intro to DNA
2 - DNA & RNA Structure
3 - DNA Replication
4 - Transcription
5 - Translation
6 - Genetic Engineering
The presentations themselves contains minimal information as they are intended to be used with teacher guidance. There are 'Video' slides throughout which link to relevant and informative YouTube content. The slides are formatted to be visually pleasing and to also print well for handouts or revision. Please see the preview file (first 8 slides) for an idea of the aesthetic and level of detail in the presentation. The relevant 'Essential Knowledge' can be found below.
I have had success using these presentations to review topics after students have been exposed to the material at home. I typically have the class read relevant material (book, site, etc.) and then watch the videos the day before introducing a topic. During the class period, I use the slides to structure the discussion around the AP Bio Essential Knowledge objectives. The remaining class time is spent reinforcing the knowledge or working on activities geared toward the 'Learning Objectives'.
**These presentations are based on the AP Biology Course Guide and does not follow any textbook
As always, please let me know if you have any suggestions for improvements. These are always a work in progress!
Dokimi AP Biology PPTs:
Big Idea 1 - Evolution (BUNDLE)
• 1.A - Evolution (all)n
1.A.1 - Natural Selection
1.A.2/3 - Phenotypic Variation & Genetic Drift
1.A.4 - Evidence for Evolution
• 1.B - Phylogeny
• 1.C - Speciation
• 1.D - Origin of Life
Big Idea 2 - Matter
• 2.A - Energy & Matter (all)
2.A.1 - Energy Input (free)
2.A.2 - Energy Capture & Storage
2.A.3 - Environmental Exchanges/Interaction
• 2.B - Cell Membrane
Big Idea 3 - Information
• 3.A - Inheritance (all)
3.A.1 - DNA & RNA
3.A.2 - Cell Division
3.A.3 - Mendelian Patterns
3.A.4 - Non-Mendelian Patterns (free)
Big Idea 4 - Interactions & Complexity (BUNDLE)
• 4.A - Interactions (all)
4.A.1 - Biomolecules
4.A.2/3/4 - Differentiation, Organelles & Organ System Interactions
4.A.5/6 - Community & Ecosystem Interactions
• 4.B - Competition & Cooperation
• 4.C - Diversity
The Essential Knowledge covered includes:
3.A.1 - DNA & RNA
DNA, and in some cases RNA, is the primary source of heritable information.
a. Genetic information is transmitted from one generation to the next through DNA or RNA.
- 1. Genetic information is stored in and passed to subsequent generations through DNA molecules and,
in some cases, RNA molecules.
- 2. Noneukaryotic organisms have circular chromosomes, while eukaryotic organisms have multiple linear
chromosomes, although in biology there are exceptions to this rule.
- 3. Prokaryotes, viruses and eukaryotes can contain plasmids, which are small extra-chromosomal,
double-stranded circular DNA molecules.
- 4. The proof that DNA is the carrier of genetic information involved a number of important historical experiments.
i. Contributions of Watson, Crick, Wilkins, and Franklin on the structure of DNA
ii. Avery-MacLeod-McCarty experiments
iii. Hershey-Chase experiment
- 5. DNA replication ensures continuity of hereditary information.
-- i. Replication is a semiconservative process; that is, one strand serves as the template for a new,
-- ii. Replication requires DNA polymerase plus many other essential cellular enzymes, occurs bidirectionally,
and differs in the production of the leading and lagging strands.
- 6. Genetic information in retroviruses is a special case and has an alternate flow of information: from RNA to
DNA, made possible by reverse transcriptase, an enzyme that copies the viral RNA genome into DNA. This DNA
integrates into the host genome and becomes transcribed and translated for the assembly of new viral progeny.
b. DNA and RNA molecules have structural similarities and differences that define function.
- 1. Both have three components — sugar, phosphate and a nitrogenous base — which form nucleotide units that
are connected by covalent bonds to form a linear molecule with and ends, with the nitrogenous bases
perpendicular to the sugar-phosphate backbone.
- 2. The basic structural differences include:
-- i. DNA contains deoxyribose (RNA contains ribose).
-- ii. RNA contains uracil in lieu of thymine in DNA.
-- iii. DNA is usually double stranded, RNA is usually single stranded.
-- iv. The two DNA strands in double-stranded DNA are antiparallel in directionality.
- 3. Both DNA and RNA exhibit specific nucleotide base pairing that is conserved through evolution: adenine pairs
with thymine or uracil (A-T or A-U) and cytosine pairs with guanine (C-G).
-- i. Purines (G and A) have a double ring structure.
-- ii. Pyrimidines (C, T and U) have a single ring structure.
- 4. The sequence of the RNA bases, together with the structure of the RNA molecule, determines RNA function.
-- i. mRNA carries information from the DNA to the ribosome.
-- ii. tRNA molecules bind specific amino acids and allow information in the mRNA to be translated to a linear
-- iii. rRNA molecules are functional building blocks of ribosomes.
-- iv. The role of RNAi includes regulation of gene expression at the level of mRNA transcription.
c. Genetic information flows from a sequence of nucleotides in a gene to a sequence of amino acids in a protein.
- 1. The enzyme RNA-polymerase reads the DNA molecule in the to direction and synthesizes complementary
mRNA molecules that determine the order of amino acids in the polypeptide.
- 2. In eukaryotic cells the mRNA transcript undergoes a series of enzyme-regulated modifications.
-- Addition of a poly-A tail
-- Addition of a GTP cap
-- Excision of introns
- 3. Translation of the mRNA occurs in the cytoplasm on the ribosome.
- 4. In prokaryotic organisms, transcription is coupled to translation of the message. Translation involves energy
and many steps, including initiation, elongation and termination. The salient features include:
-- i. The mRNA interacts with the rRNA of the ribosome to initiate translation at the (start) codon.
-- ii. The sequence of nucleotides on the mRNA is read in triplets called codons.
-- iii. Each codon encodes a specific amino acid, which can be deduced by using a genetic code chart. Many
amino acids have more than one codon.
-- iv. tRNA brings the correct amino acid to the correct place on the mRNA.
-- v. The amino acid is transferred to the growing peptide chain.
-- vi. The process continues along the mRNA until a “stop” codon is reached.
-- vii. The process terminates by release of the newly synthesized peptide/protein.
d. Phenotypes are determined through protein activities.
e. Genetic engineering techniques can manipulate the heritable information of DNA and, in special cases, RNA.
- Plasmid-based transformation
- Restriction enzyme analysis of DNA
- Polymerase Chain Reaction (PCR)
f. Illustrative examples of products of genetic engineering include:
- Genetically modified foods
- Transgenic animals
- Cloned animals
- Pharmaceuticals, such as human insulin or factor X