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5 Written Questions

5 Matching Questions

  1. C is pair with
  2. Reading frame
  3. Transcription
  4. Transcript
  5. A is pair with
  1. a G -> C:G. G is bound to C by three hydrogen bond
  2. b Grouping of a stretch of nucleotides into sequential triplets; an mRNA molecule has 3 reading frames, but only 1 is typically used in translation.
  3. c Process 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. d T -> A:T. A is bound to T by two hydrogen bonds
  5. e Is a fragment of RNA. Numerous transcripts can be produced from one chromosome

5 Multiple Choice Questions

  1. Includes 1) Phosphate group 2) 5 carbon sugar -> Deoxyribose 3) Nucleotides bond covalently between the 5'PO4 of one nucleotide and the 3'OH of another -> Joining of nucleotides creates an alternating sugar-phosphate backbone
  2. 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. Are 1) Adenine (A) - purine, 2) Thymine (T) - pyrimidine 3) Guanine (G) - purine 4) Cytosine (C) - pyrimidine
  4. Mechanisms to enhance survivability 1) Antigenic variation 2)
  5. 1) Strands are complementary to each other -> Due to the specific base pairing of bases -> A:T and C:G 2) Strands are held together with hydrogen bonds -> A is bound to T by two hydrogen bonds and G is bound to C by three hydrogen bond

5 True/False Questions

  1. 3' refers to5'PO4. 1 strand of the DNA has a phosphate attached at the number 5 carbon of the sugar. -> Termed the five prime (5') end


  2. DNA (characteristic)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


  3. Regulating the expression of genes1) 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


  4. (G)Thymine


  5. Gene Expression1) Involves two separate but interrelated process, transcription and translation 2) RNA polymerase binds to a region of the DNA called the promoter 2.1) Only one strand of DNA acts as a template 2.1.1) This is called the sense strand 2.1.2) The strand not transcribed is the nonsense strand 3) Nucleotides in RNA are the same as those in DNA with one exception 3.1) Thymine is replaced with uracil 3.1.1) Binding in RNA is A:U or U:A and C:G or G:C 4) RNA polymerase continues down strand of DNA until it reaches a site on DNA called the terminator -> At the terminator RNA polymerase and the new strand of mRNA are released from strand of DNA 5)


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