The connection point of two sister chromatids
is called the
a. chromatid.
b. chromatin.
c. centriole.
d. centrosome.
e. centromere
E
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In males, sterilization involves a vasectomy, which removes a portion of what structure?
A. Sertoli cells B. vas deferens C. seminiferous tubules D. epididymis
Refer to the graph above. At the same time that the stimulus was introduced, a drug that specifically inhibits sodium channels was added to the system. The effect this would have is that the membrane would
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A) not depolarize.
B) depolarize for the first impulse but not for a second one.
C) not be able to repolarize.
D) repolarize, but would not for a second impulse.
E) none of the above
Which of the following statements concerning PCR is false?
a. PCR can only be carried out if DNA polymerase is heat-resistant. b. PCR is used to amplify tiny quantities of DNA in vitro. c. PCR replicates specific DNA sequences. d. PCR has applications for archaeology and crime scene analysis. e. PCR utilizes a heat-sensitive Taq polymerase.
How long have prokaryotes lived on Earth?
What will be an ideal response?