DNA profiling DNA profiling (also called DNA testing‚ DNA typing‚ or genetic fingerprinting) is a technique employed by forensic scientists to assist in the identification of individuals on the basis of their respective DNA profiles. DNA profiles are encrypted sets of numbers that reflect a person’s DNA makeup‚ which can also be used as the person’s identifier. DNA profiling should not be confused with full genome sequencing. It is used in‚ for example‚ parental testing and rape investigation
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BIOL1102 2008 PRACTICE QUESTIONS FOR THE MID-TERM EXAM Practice Questions from week 2 lectures 1. The presence of cholesterol in the plasma membrane of some animals: a) Enables the membrane to stay fluid more easily when cell temperature drops b) Enables the animal to remove hydrogen atoms from saturated phospholipids c) Enables the animal to add hydrogen atoms to unsaturated phospholipids d) Makes the membrane less flexible‚ allowing it to sustain greater
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e. a‚ b‚ & c Question 2 1 out of 1 points Nucleotides on a single-stranded DNA molecule are connected by: Answer Selected Answer: phosphodiester bonds Question 3 10 out of 10 points The polarity of DNA synthesis is Answer Selected Answer: 5’-->3’ Question 4 1 out of 1 points "The ratio of adenine to thymine in DNA (is) __________‚ while the ratio of adenine to cytosine (is) __________:" Answer Selected
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DNA & RNA Jo Howell Biochemistry‚ Task 208.5.1 02-05 Western Govenor’s University Process of DNA Replication The double helix is unwound by helicase & each strand then acts as a template for the next strands Primase creates the DNA primer DNA polymerase III is the main copying enzyme DNA polymerase I removes RNA primers & replaces with DNA Single Stranded Binding Proteins are available to hold the unwound DNA strands in position & prevents premature annealing with another
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Replication fork Scheme of the replication fork. a: template‚ b: leading strand‚ c: lagging strand‚ d: replication fork‚ e: primer‚ f: Okazaki fragments Many enzymes are involved in the DNA replication fork. The replication fork is a structure that forms within the nucleus during DNA replication. It is created by helicases‚ which break the hydrogen bonds holding the two DNA strands together. The resulting structure has two branching "prongs"‚ each one made up of a single strand of DNA. These two
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Franklin Stahl are two biologists who prove that DNA replication was semiconservative. At the time‚ many strong evidences from experiments using bacterial viruses had already convinced most scientists that DNA was the molecule of heredity; however they knew little about the DNA replication process. After the dimensionally accurate model building by Watson and Crick‚ it was clear that the process of replication and information distribution have to use the DNA from parent cell as template to achieve an
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Updated March 2011 DNA‚ RNA structure and function Why are multiple copies of tRNA and rRNA genes needed? a. These RNAs are destroyed very rapidly. b. These RNAs are very stable. c. These RNAs are needed in large amounts. d. These RNAs do not benefit from the extra amplification step that occurs for protein-encoding genes. e. c and d If you treat mitotic chromosomes with solutions that extract histones‚ what happens? a. The chromosomes become more condensed
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thing Archaea: Most are unicellular and microscopic. Prokaryotic. Example: ancient bacteria‚ live in harsh enviorments‚ Eukarya: Contain a nucleus and organelles. Eukaryotic. Example: Plants‚ animals‚ fungi and all other forms of life -All have cells‚ dna‚ rna‚ membrane‚ ribosomes Producer to Tertiary Consumer in an energy pyramid (trophic levels) -Trophic structure / levels~ feeding relationships in an ecosystem -Primary producers~ the trophic level that supports all others; autotrophs -Primary consumers~
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Concept Check 14.1 C O N C E P T C H E C K 14.1 1. Pea plants heterozygous for flower position and stem length (AaTt) are allowed to selfpollinate‚ and 400 of the resulting seeds are planted. Draw a Punnett square for this cross. How many offspring would be predicted to have terminal flowers and be dwarf? (See Table 14.1.) 1. According to the law of independent assortment‚ 25 plants (1⁄16 of the offspring) are predicted to be aatt‚ or recessive for both characters. The actual result is likely
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22 mortal cell lines.Telomeres is a repeated DNA sequence(TTAGGG) found at the ends of linear chromosomes that protect the ends of the chromosome from degradation‚ or telomere can be defined as DNA sequences found at the ends of eukaryotic chromosomes which maintain the fidelity of genetic information during replication. At birth as determined by terminal restriction fragment analysis‚ telomeres consist of about 15‚000 base pairs of repeated TTAGGG DNA sequences‚ which become shorter with each cell
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