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5 Written questions

5 Matching questions

  1. A is pair with
  2. Repressible enzymes
  3. Stop codon
  4. tRNA
  5. 5' refers to
  1. a 1) Routinely synthesized 2) Generally involved in biosynthesis
  2. b Transfer RNA -> type of RNA molecule that acts as a key, interpreting the genetic code; each tRNA molecule carries a specific amino acid. tRNA recognizes specific sequences of mRNA and transports the required amino acids to form a polypeptide chain
  3. c T -> A:T. A is bound to T by two hydrogen bonds
  4. d 5'PO4. 1 strand of the DNA has a phosphate attached at the number 5 carbon of the sugar. -> Termed the five prime (5') end
  5. e Codon that terminates translation, signaling the end of the protein; there are 3 stop codons

5 Multiple choice questions

  1. 1) Codons are groups of three nucleotides situated next to each other on DNA 2) Codons are written in terms of their base sequence in mRNA 3) The sequence of codons determines the sequence of amino acids in the protein 4) There are 64 codons that make up the "alphabet" of proteins 4.1) Of the 64 codons, 61 are sense codons -> Each coding a specific amino acid 4.2) The remaining 3 are nonsense codons -> These code for termination of the message 5) Codons contained in mRNA are read into proteins through translation -> The site of translation is the ribosome 6) Each codon has an anticodon -> The anticodon is complementary sequence to the codon
  2. 1) Nucleotide sequence codes for regulation mechanism for gene expression 2) Mechanisms determine duration of synthesis of gene products -> Products are only made when required 3) Key mechanism is regulation of mRNA synthesis from DNA -> Regulation of transcription
  3. Routine switching on and off of certain genes -> Altering expression allows portions of population to survive and multiply
  4. Sequence at which RNA synthesis stops; the RNA polymerase falls off the DNA template and releases the newly synthesized RNA.
  5. 1) Made up of deoxy-ribonucleotides 2) Nucleotides bond covalently between the 5'PO4 of one nucleotide and the 3'OH of another 3) Each sugar (deoxyribose) molecule is connected to a nitrogenous base 4) Chemical structure and joining of nucleotide subunits causes strands to differ at the ends 5) DNA occurs as double-stranded molecule 5) DNA molecule is antiparallel

5 True/False questions

  1. 3' refers to3'OH -> 1 strand of the DNA has a hydroxyl group attached to the number 3 carbon of the sugar. -> Termed the three prime (3') end


  2. mRNAMessenger RNA -> type of RNA molecule that is translated during protein synthesis.


  3. Mechanisms controlling transcriptionProcess of synthesizing RNA from DNA template 1) mRNA carries the coded information from DNA to the ribosome, which is the site of protein synthesis 2) mRNA also plays an important role in translation 3) During transcription the enzyme, RNA polymerase, synthesizes a complementary strand of mRNA from a portion of unwound DNA


  4. Gene Expression1) Control mechanism that inhibits gene expression and decreases the synthesis of enzymes 2) Repression is usually in response to the overabundance of an end product 2.1) Repression decreases the rate synthesis of enzymes leading to the formation of the particular end product 2.2) Regulatory proteins called repressors mediate repression -> Repressors block the ability of RNA polymerase to bind and initiate protein synthesis


  5. Melting or denaturingIs when you separate the 2 strands of a DNA