5 Written Questions
5 Matching Questions
- Start codon
- Regulating the expression of genes
- a 1) Control mechanism that turns on the transcription of a gene or set of genes 2) Inducers are substances that act to induce transcription -> Enzymes synthesized in the presence of inducers are called inducible enzymes
- b 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
- c Cytosine
- d Codon at which translation is initiated; it is typically the first AUG after a ribosome-binding site.
- e Sequence of 3 nucleotides in a tRNA molecule that is complementary to a particular codon in mRNA. The anticodon allows the tRNA to recognize and bind to the appropriate codon.
5 Multiple Choice Questions
- Replication is bidirectional -> Replication begins at specific starting point -> Proceeds in opposite directions -> Allows replication to proceed more quickly
- 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
- 1) RNA is made up of nucleotides -> Ribonucleotides 2) RNA contains nitrogenous bases -> Adenine, Guanine, Cytosine, Uracil (Uracil replaces thymine in RNA) 3) RNA usually exists as single stranded molecule 4) Portion of DNA acts of template for RNA synthesis -> Either strand of DNA can act as template 5) Three different functional groups of RNA mRNA, rRNA, tRNA
- Ribosomal RNA -> type of RNA molecule present in ribosomes. rRNA builds the ribosomes
- Messenger RNA -> type of RNA molecule that is translated during protein synthesis.
5 True/False Questions
Antigenic variation → Alteration in characteristics of certain surface proteins -> Example: Neisseria gonorrhoeae hides from host immunity by changing numerous surface proteins
5' refers to → 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
(A) → Adenine
Terminator → 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' refers to → 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