HHMI – The Double Helix 1. What are the chemical components of a
... die. Griffith took the DNA from dead pathogenic bacteria and transferred it into living nonpathogenic bacteria. These altered bacteria were then injected into healthy mice. The mice ...
... die. Griffith took the DNA from dead pathogenic bacteria and transferred it into living nonpathogenic bacteria. These altered bacteria were then injected into healthy mice. The mice ...
NAME: MAKING A DNA MODEL PERIOD:______ DATE:______
... A molecule of DNA is composed of two backbones and four types of chemical bases. The backbone is formed by a chain of alternating phosphates and sugars. Each sugar molecule provides the location for the nitrogen bases to attach. The four types of bases are adenine, thymine, guanine, and cytosine. Ty ...
... A molecule of DNA is composed of two backbones and four types of chemical bases. The backbone is formed by a chain of alternating phosphates and sugars. Each sugar molecule provides the location for the nitrogen bases to attach. The four types of bases are adenine, thymine, guanine, and cytosine. Ty ...
DNA Study Guide Answer Key
... 10. How many strands of nucleotides are in DNA? 2 11. Why is DNA replication necessary and important? In order to pass exact copies to daughter cells 12. Define the following: a. Helicase: An enzyme that moves along the DNA molecules breaking hydrogen bonds b. DNA polymerase Attaches at many differe ...
... 10. How many strands of nucleotides are in DNA? 2 11. Why is DNA replication necessary and important? In order to pass exact copies to daughter cells 12. Define the following: a. Helicase: An enzyme that moves along the DNA molecules breaking hydrogen bonds b. DNA polymerase Attaches at many differe ...
The Twenty-Sixth Annual Student Research Symposium in Memory
... DNA constantly undergoes double-strand breaks (DSBs) due to ionizing radiation, certain chemicals, and malfunctions in replication and transcription. Cell death ensues if the DSB is not repaired. Homologous recombination is a major pathway by which DSBs are repaired, and this pathway involves the br ...
... DNA constantly undergoes double-strand breaks (DSBs) due to ionizing radiation, certain chemicals, and malfunctions in replication and transcription. Cell death ensues if the DSB is not repaired. Homologous recombination is a major pathway by which DSBs are repaired, and this pathway involves the br ...
DNA: The Genetic Material
... nucleotides and links them – All have several common features • Add new bases to 3′ end of existing strands • Synthesize in 5′-to-3′ direction • Require a primer of RNA ...
... nucleotides and links them – All have several common features • Add new bases to 3′ end of existing strands • Synthesize in 5′-to-3′ direction • Require a primer of RNA ...
DNA - PBworks
... • 1. This technology could allow a 60-year old woman to have a baby. Do you think this would be a positive or negative outcome of the technology? Why? • 2. During World War II, Nazis in Germany conducted experiments to selectively breed blond, blue-eyed men and women. This is an example of eugenics ...
... • 1. This technology could allow a 60-year old woman to have a baby. Do you think this would be a positive or negative outcome of the technology? Why? • 2. During World War II, Nazis in Germany conducted experiments to selectively breed blond, blue-eyed men and women. This is an example of eugenics ...
Chapter Review
... ____________________________________________________________________ ____________________________________________________________________ The statements below are false. For each statement, replace the underlined term to make a true statement. ...
... ____________________________________________________________________ ____________________________________________________________________ The statements below are false. For each statement, replace the underlined term to make a true statement. ...
Name______________________________________________
... Using a pipette, slowly add cold rubbing alcohol; let the alcohol run down the side of the test tube so it forms a layer on top of the soapy liquid. Add alcohol until you have about 2 cm of alcohol in the tube. Alcohol is less dense than water, so it floats on top. Do not mix or bump the test tube f ...
... Using a pipette, slowly add cold rubbing alcohol; let the alcohol run down the side of the test tube so it forms a layer on top of the soapy liquid. Add alcohol until you have about 2 cm of alcohol in the tube. Alcohol is less dense than water, so it floats on top. Do not mix or bump the test tube f ...
multiple choice
... Meselson and Stahl used a heavy form of nitrogen to demonstrate semi-conservative DNA replication. Bacterial cells were grown in the presence of heavy nitrogen until all the DNA contained the heavy form. The bacteria were then transferred to a medium that only contained the light form of nitrogen. ...
... Meselson and Stahl used a heavy form of nitrogen to demonstrate semi-conservative DNA replication. Bacterial cells were grown in the presence of heavy nitrogen until all the DNA contained the heavy form. The bacteria were then transferred to a medium that only contained the light form of nitrogen. ...
Genes and Heredity Nucleotide Structure A G C T A C DNA
... Gene = Short segment of a chromosome (usually hundreds to many thousands of nucleotides long) that encodes amino acid sequence of a functional product (an RNA or protein) ...
... Gene = Short segment of a chromosome (usually hundreds to many thousands of nucleotides long) that encodes amino acid sequence of a functional product (an RNA or protein) ...
1 - HCC Learning Web
... The DNA double helix makes one full turn at? What is the distance between two nucleotides of DNA? What is the number of base pairs in each turn of the double helix of DNA? The backbone of the DNA molecule is formed by what bonds? DNA strands are said to be antiparallel. Antiparallel means what? Did ...
... The DNA double helix makes one full turn at? What is the distance between two nucleotides of DNA? What is the number of base pairs in each turn of the double helix of DNA? The backbone of the DNA molecule is formed by what bonds? DNA strands are said to be antiparallel. Antiparallel means what? Did ...
end-of-chapter-review-package-answer-key
... DNA is made of a double strand of nucleotides Each nucleotide contains a deoxyribose sugar, a nitrogenous base and a phosphate group The nucleotides are joined together along their sugar and phosphate groups with the bases sticking out from each strand The double strand of DNA runs is an ant ...
... DNA is made of a double strand of nucleotides Each nucleotide contains a deoxyribose sugar, a nitrogenous base and a phosphate group The nucleotides are joined together along their sugar and phosphate groups with the bases sticking out from each strand The double strand of DNA runs is an ant ...
Molecular Biology 2.6- Structure of DNA and RNA
... • The story of the elucidation of the structure of DNA illustrates that cooperation and collaboration among scientists exists alongside competition between research groups. • To what extent is research in secret ‘anti-scientific’? • What is the relationship between shared and personal knowledge in t ...
... • The story of the elucidation of the structure of DNA illustrates that cooperation and collaboration among scientists exists alongside competition between research groups. • To what extent is research in secret ‘anti-scientific’? • What is the relationship between shared and personal knowledge in t ...
Modern Genetics questions and answer key
... E) DNA ligase is attached to the leading strand 43. Although eukaryotic cells contain over a thousand times more DNA than is found in a prokaryotic cell, it only takes a eukaryotic cell a few hours to copy all of its genetic material because A) eukaryotic DNA polymerases delete unnecessary material ...
... E) DNA ligase is attached to the leading strand 43. Although eukaryotic cells contain over a thousand times more DNA than is found in a prokaryotic cell, it only takes a eukaryotic cell a few hours to copy all of its genetic material because A) eukaryotic DNA polymerases delete unnecessary material ...
Strawberry DNA Extraction Adapted from a lab by C. Sheldon
... 7. Pour filtrate into test tube so that it is 1/8 full. 8. Slowly pour the ice-cold alcohol into the tube until the tube is half full and forms a layer over the top of the strawberry extract. 9. At the interface, you will see the DNA precipitate out of solution and float to the top. You may spool th ...
... 7. Pour filtrate into test tube so that it is 1/8 full. 8. Slowly pour the ice-cold alcohol into the tube until the tube is half full and forms a layer over the top of the strawberry extract. 9. At the interface, you will see the DNA precipitate out of solution and float to the top. You may spool th ...
Replication PP
... Complimentary Strands • Complementary Sequences: Two strands of nucleotides that stick together because they have “opposite” sequences that form “base pairs”. • (A-T; G-C) Hey, nice sequence! ...
... Complimentary Strands • Complementary Sequences: Two strands of nucleotides that stick together because they have “opposite” sequences that form “base pairs”. • (A-T; G-C) Hey, nice sequence! ...
DNA, RNA, Protein Synthesis - Social Circle City Schools
... around each other like a twisted ladder. • Strands are held together by weak hydrogen bonds. • The building blocks of DNA are called NUCLEOTIDES (made up of 3 things): ...
... around each other like a twisted ladder. • Strands are held together by weak hydrogen bonds. • The building blocks of DNA are called NUCLEOTIDES (made up of 3 things): ...
2/4:DNA extraction lab
... To get the DNA out of cells you need to break open both the cell membranes and the nuclear membranes. Cell membranes and nuclear membranes consist primarily of lipids. Dishwashing detergent, like all soaps, breaks up clumps of lipids. This is why you use detergents to remove fats. Why did I add enzy ...
... To get the DNA out of cells you need to break open both the cell membranes and the nuclear membranes. Cell membranes and nuclear membranes consist primarily of lipids. Dishwashing detergent, like all soaps, breaks up clumps of lipids. This is why you use detergents to remove fats. Why did I add enzy ...
IV.D.3 ISOLATION OF DNA FRAGMENTS FROM
... Place the gel slice on a glass plate and chop it into fine pieces with a razor blade. Transfer the pieces to a small test tube and add 1 volume of elution buffer (0.5 M ammonium acetate and 1 mM EDTA [pH8.0]). ...
... Place the gel slice on a glass plate and chop it into fine pieces with a razor blade. Transfer the pieces to a small test tube and add 1 volume of elution buffer (0.5 M ammonium acetate and 1 mM EDTA [pH8.0]). ...
Molecular genetics of bacteria
... quickly to changes in environment. • E. coli needs 30 minutes to replicate its DNA, but only 20 minutes to divide into two. How? It gets a head start. ...
... quickly to changes in environment. • E. coli needs 30 minutes to replicate its DNA, but only 20 minutes to divide into two. How? It gets a head start. ...
3 – DNA Replication
... Describe what must happen to DNA in order for cells to divide ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ __________ ...
... Describe what must happen to DNA in order for cells to divide ________________________________________________________ ________________________________________________________ ________________________________________________________ ________________________________________________________ __________ ...
Homologous recombination
Homologous recombination is a type of genetic recombination in which nucleotide sequences are exchanged between two similar or identical molecules of DNA. It is most widely used by cells to accurately repair harmful breaks that occur on both strands of DNA, known as double-strand breaks. Homologous recombination also produces new combinations of DNA sequences during meiosis, the process by which eukaryotes make gamete cells, like sperm and egg cells in animals. These new combinations of DNA represent genetic variation in offspring, which in turn enables populations to adapt during the course of evolution. Homologous recombination is also used in horizontal gene transfer to exchange genetic material between different strains and species of bacteria and viruses.Although homologous recombination varies widely among different organisms and cell types, most forms involve the same basic steps. After a double-strand break occurs, sections of DNA around the 5' ends of the break are cut away in a process called resection. In the strand invasion step that follows, an overhanging 3' end of the broken DNA molecule then ""invades"" a similar or identical DNA molecule that is not broken. After strand invasion, the further sequence of events may follow either of two main pathways discussed below (see Models); the DSBR (double-strand break repair) pathway or the SDSA (synthesis-dependent strand annealing) pathway. Homologous recombination that occurs during DNA repair tends to result in non-crossover products, in effect restoring the damaged DNA molecule as it existed before the double-strand break.Homologous recombination is conserved across all three domains of life as well as viruses, suggesting that it is a nearly universal biological mechanism. The discovery of genes for homologous recombination in protists—a diverse group of eukaryotic microorganisms—has been interpreted as evidence that meiosis emerged early in the evolution of eukaryotes. Since their dysfunction has been strongly associated with increased susceptibility to several types of cancer, the proteins that facilitate homologous recombination are topics of active research. Homologous recombination is also used in gene targeting, a technique for introducing genetic changes into target organisms. For their development of this technique, Mario Capecchi, Martin Evans and Oliver Smithies were awarded the 2007 Nobel Prize for Physiology or Medicine.