"Heat shock" is an effective means of
A. inserting a DNA fragment into a vector.
B. introducing DNA into animal cells.
C. introducing DNA into plant cells.
D. introducing DNA into bacteria.
E. starting a PCR cycle.
Answer: D
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A patient arrives at the hospital by ambulance, presenting symptoms of confusion, partial paralysis, and slurred speech. The attending physician quickly diagnoses a stroke as the most likely cause and injects the patient with tissue plasminogen activator (tPA) to dissolve the clots, but the patient’s symptoms continue to deteriorate over the next few minutes. What is the most likely explanation for the patient’s failure to respond to treatment?
a. The patient has chronic epilepsy and has been misdiagnosed. b. Multiple clots caused the stroke, and another dose of tPA is required. c. The stroke occurred due to a burst blood vessel instead of a clot. d. A stroke cannot be treated by tPA once paralysis has occurred.
How is the resting membrane potential established?
What will be an ideal response?
Cells that have undergone a response that causes them to enter a permanent state of growth arrest, like those that comprise a mole are said to have entered a state called
a) adolescence b) senescence c) pubescence d) bellioscosity
What would happen if snRNAs did not recognize the branch point within an intron?
A. A 3' poly A tail would not be added to the transcript. B. A lariat would not form. C. snRNAs would not base pair with the 5' end of the intron. D. A 5' cap would not be added to the transcript.