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BIS002A Final Practice S10 Comai

BIS002A Final Practice S10 Comai - 1 The amount of nuclear...

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1 The amount of nuclear DNA in a cell during cell cycle and meiosis will be as follows: Answer G1 G2 Prophase I Prophase II End cell a 2 4 8 4 2 b 2 2 4 2 1 c 2 4 4 2 1 d 2 4 2 2 1 e 2 4 4 1 1 2 Considering eukaryotes in general (not just human or plants), how many mitoses are possible between the end of meiosis and the fusion of the gametes (3 pt)? a 0 b 0 to 2 c 0 to 3 d 0 to 7 e 0 to a very large number 3 Phosphorylation of proteins serves the following role (3 pt) : a makes the target protein membrane soluble b causes denaturation of the protein c positive or negative regulation, depending on the protein d marks peptide bond for immediate hydrolysis e blocks translation causing ribosome to fall off 4 The phylogenetic relationship between different species can be studied by comparing (3 pt) : a the manner of DNA replication b related sequences of proteins and DNA c unrelated sequences of proteins and DNA d the size of cells and the number of organelles e the number of expressed genes before meiosis - 1 -
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5 The following are hydrophobic aminoacids (see table of structures at end): a Glu, Asp, Lys b Ser, Thr c Gly, Gln, Asn d Phe, Trp, Ile e Pro, Cys 6 An intron is (3 pt): a transcribed, not replicated b transcribed, not translated c removed from DNA at replication d added to RNA after transcription e recognized by the ribosome at the end of translation 7 A good deal of the differences between cell types in a multicellular organism are explained by (3 pt): a different types of energy metabolism b different mutations in the cells types c different chromosomal make-up achieved by differential inheritance at mitosis d different chromosomal make-up achieved by differential inheritance at meiosis e differential transcription of genes 8 The presence of DNA inside the mitochondrion is best explained by the following (3 pt) : a permanent uptake into organelles of nuclear DNA after meiosis b ancient formation of organelles from nuclear-produced vescicles c temporary location into organelles of nuclear DNA during replication d ancient incorporation of a prokaryotic cell in the cytoplasm of another organism e transport of mRNA into organelles by ribosomes - 2 -
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9 In an heterozygous organism (Zz) at G2 , the following DNA copies of the "Z" gene are found and their position is: answer sequences position in the cell ( | = a dsDNA molecule) Z z a 1 1 Z||z b 2 2 Z||Z z||z c 2 2 Z||z d 4 4 Z||Z Z||Z z||z z||z e 4 4 Z||z Z||z Z||z Z||z 10 Starting with a Zz cell, choose the correct number of DNA copies of the "Z" gene found at the cell poles at the end of anaphase I of meiosis. Crossing over is allowed (may or may not happen). answer position North pole South pole a ZZ zz b ZZzz none c Zz Zz d Z z e either "a" or "c" - 3 -
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11 Discovery of the genetic code was achieved by (3 pt): a microscopy of ribosomes during translation b isolation of mRNA from the cell and in vitro translation c synthesis of artificial mRNA and in vitro translation d in vitro transcription of artificial RNA e in vitro replication of artificial genes 12
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