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When a ribosome first attaches to an m-RNA, two t-RNAs bind to the ribosome.  The first t-RNA that recognizes the initiation codon binds to the:

Which of the following is NOT related to ribosomal activity?

Depolarization is the process of restoring resting potential

Transcription factors assist RNA polymerase bind to the DNA

Identify the regions or molecules (6 marks) 1. ______ 2. ______ 3. ______ 4. ______ 5. ______ 6. ______

G3P is a useful product for green plants because it

cAMP binds to the activator protein in the lac operon to activate transcription

In a C3 plant, carbon dioxide entering the Calvin cycle binds with

Use the following diagram to answer the question below: Chose the appropriate letter. In the Meselson-Stahl experiment, bacteria were grown in a medium containing 15N (radioactive nitrogen) and were then transferred to an environment containing 14N.  Which of the above results would be expected after two DNA replications?

Given the following codons and their corresponding amino acids (T & I /10)     UUU- Pheylalanine     CUA – Leucine     GCU – Alanine     AAA – Lysine a)  show the mRNA which codes for the short peptide, lys-ala-phe-leu.  Include what should come before and after this short message. (2 ) b)    Show the tRNAs that would line up at the mRNA and their anticodons (2) c)  Show the base sequence that would be found in the DNA double helix which carries the gene for this peptide.  Label the coding and template strand. d)    What if there was a frameshift at leucine.  A cytosine was inserted directly after the first cytosine (on the template strand).  How would the amino acid sequence be altered?  Would this alter translation? e)  When the DNA was replicated which enzymes were responsible for this error?