In E. coli, the cya gene encodes adenylate cyclase. Will cells that are cya? be able to grow on medium that contains lactose as the sole carbon source? Why or why not?
What will be an ideal response?
No. Metabolically, cells that are cya? would be similar to wild-type cells that are grown in the presence of both glucose and lactose. Although negative regulation has been relieved (the small amounts of allolactose produced binds the lac repressor protein, removing it from the lac operator), there is no positive regulation by CAP-cAMP because cAMP is not synthesized. Therefore, only basal transcription occurs. This is not sufficient to drive active lactose metabolism.
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A condition in which both copies of a chromosome are inherited from one parent is called ____________________
Fill in the blank(s) with correct word
In order for protein synthesis to begin, which of the following statements reflects the correct sequence of events?
A. The 3' end of the mRNA binds to the small ribosomal subunit and the AUG anticodon on the tRNA base pairs with the UAC codon on the mRNA, allowing the large ribosomal subunit to attach. B. The 5' end of the mRNA binds to the small ribosomal subunit, and the large subunit joins, creating the P and A sites where reactions between codons on the mRNA and anticodons on tRNA are stabilized. C. The AUG codon on mRNA base pairs with the UAC anticodon on tRNA allowing the small and large ribosomal subunits to join the complex. D. Translation begins when the ribosome translocates from the A site to the P site on the mRNA
An individual reports to the doctor that they are experiencing pain in their left arm. What would the
doctor think may be wrong? What will be an ideal response?
Scarlet fever involves
A) Bright red rash on face, trunk, inner arms and legs, and tongue. B) Eventual desquamation of epidermis. C) Septicemia as a complication. D) High fever E) All of these choices are correct