Which of the following is not a step in nonhomologous end joining?
A. phosphorylation of the Ku70-Ku80 complex
B. degradation of any single-strand overhangs or hairpins from the broken ends of the chromosomes to be repaired
C. binding of the Ku70-Ku80 complex to the broken chromosome ends
D. binding of a kinase and a nuclease to the Ku70-Ku80 complex on the DNA
E. All of the steps given occur in NHEJ.
A
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An extremely rare occurrence in humans is a multiple pregnancy with the embryos at different stages due to fertilization weeks apart. What mechanism normally prevents this from happening?
A. The embryo's secretion of FSH and LH maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. B. The embryo's secretion of GnRH maintains the corpus luteum, keeping FSH and LH high until the placenta takes over secretion of these hormones. C. The embryo's secretion of hCG maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. D. The follicle's secretion of polar bodies maintains the fimbriae, keeping estradiol and progesterone high until the fallopian tube takes over secretion of these hormones.
Who first confirmed that the replication of DNA was semiconservative?
a. Chargaff and Hershey b. Watson and Crick c. Avery and Griffith d. Meselson and Stahl e. Watson, Crick, and Wilkins
Mendellan Genetics
What will be an ideal response?
_________ is the flow of alleles in and out of a population as a result of the migration of individuals or gametes
A. Natural selection B. Mutation C. Genetic drift D. Gene flow