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NS102 Study Problems Set 17

NS102 Study Problems Set 17 - NS102 Study Problems Set 17...

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NS102 Study Problems Set 17 The set contains study problems and exam questions from the previous semesters on the Molecular Biology, Structure and Function of DNA and DNA Technology. 1. (Exam Archive) What is the central dogma of biology? Answer: Information flow in cells is in the order DNA RNA Protein 2. (Exam Archive) The presence of what enzyme contradicts the central dogma of molecular biology? Answer: Reverse transcriptase, the enzyme that makes DNA from RNA 3. (Exam Archive) Why wouldn t you label DNA if you add radioactive sulphur to a dividing cell? Answer: The structure of nucleic acids do not have sulphur atoms, only phosphate, oxygen, carbon, hydrogen and nitrogen. Phosphate labels DNA, sulfur labels proteins. 4. (Exam Archive) In a eukaryotic cell, the enzymes DNA polymerase, RNA polymerase, ribosome work in different parts of the cell. Where do they work? Answer: Nucleus, nucleus and cytoplasm 5. (Exam Archive) You have four test tubes, one has ribosomes from rabbits, one has mRNAs from lizards, one has amino acids purified from corn seeds, and one has tRNAs from bacteria. You mix the contents of these four tubes to perform in vitro translation, you will synthesize the same proteins as those found in which species? Why?
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Answer: Lizard because of the central dogma: Genetic information is stored in DNA and then in RNA, no in other biological molecules. 6. (Exam Archive) Rank the nucleic acid structures in the order of increasing size: Gene, chromosome, nucleotide, codon Answer: Nucleotide < codon < gene < chromosome 7. (Exam Archive) In eukaryotic organisms, the initial transcription product is called the immature mRNA. During mRNA processing, the introns are removed from the immature mRNA and the exons are spliced together. The final mRNA product is called the mature mRNA. In many cases, alternative splicing may occur so that
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NS102 Study Problems Set 17 - NS102 Study Problems Set 17...

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