Give an overview of the mechanism by which ultraviolet radiation induces the lytic pathway in lambda phage
What will be an ideal response?
The DNA damage that accompanies UV irradiation may include damage to the recA gene, causing it to code for a modified protein which stimulates the lambda repressor polypeptides to cleave, inactivating them. Lack of repressor allows RNA polymerase to bind to the PR promoter, transcribing cro. Cro protein reduces synthesis of cII, which regulates lambda repressor synthesis. Eventually, enough Q proteins accumulate from the transcription from the PR promoter to initiate the lytic pathway.
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In balanced translocation heterozygotes, which pattern of chromosome segregation produces viable gametes and progeny?
A) adjacent-1 segregation B) adjacent-2 segregation C) alternate segregation D) Adjacent-1 and alternate segregation are both viable. E) Adjacent-1, adjacent-2, and alternate segregation are all viable.
If a cell is in G2:
a. it has twice the amount of DNA present in a telophase nucleus. b. it has visibly distinct chromosomes. c. it lacks a visible nuclear membrane. d. it is in mitosis. e. it is in cytokinesis
The internal urinary sphincter
A. is under voluntary control. B. is only found in females. C. is only found in males. D. prevents the semen from being released during urination. E. Both is under voluntary control and is only found in males are correct.
According to Dr. Losos, the independent evolution of similar species on the different islands is an example of which of the following processes? "
A. Reproductive isolation B. Sexual selection C. Convergent evolution D. Disruptive equilibrium