The distribution of living organisms would be
increased by
a. continental drift.
b. the formation of Pangea.
c. the sea-floor spreading.
d. the movement of Gondwana.
e. all but "the formation of Pangea."
E
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What process allows evolution to "experiment" with genes to create novel functions? How is this manifested in extant genes (presently existing) and their relationships to each other?
What will be an ideal response?
To generate a knockin mouse, a scientist introduces to ES cells a construct with a mutant exon and within an adjacent intron, loxP sites flanking a neomycin resistance gene. What event will occur next?
A) Homologous recombination between the mutant DNA and the corresponding gene in the mouse genome. B) Recombination between the loxP sites. C) Transplantation of cells into host blastocyst. D) Crossing of heterozygous mice to a Cre-expressing strain.
Which group of mammals exhibits the widest
distribution and greatest diversity? a. marsupials b. monotremes c. placentals d. marsupials and monotremes e. placentals and monotremes
Which of the following serves to end the menstrual
cycle? a. a surge in luteinizing hormone b. the secretion of human chorionic gonadotropin c. the breakdown of the corpus luteum d. a rise in the level of progesterone e. a drop in the level of gonadotropic hormones in the blood