Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Crosses among heterozygotes give a 12:3:1 ratio. What type of gene interaction would
account for these results?
A) multiple alleles
B) incomplete dominance
C) conditional lethal
D) epistasis
E) complementation
Answer: D
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Which of the following represents the proper order of events in embryonic development?
A. fertilization, gastrulation, neurulation, cleavage, organogenesis B. fertilization, cleavage, gastrulation, organogenesis, neurulation C. fertilization, cleavage, gastrulation, neurulation, organogenesis D. fertilization, gastrulation, cleavage, neurulation, organogenesis E. fertilization, gastrulation, cleavage, organogenesis, neurulation
What is unique about reverse transcripatse that makes it different from other DNA polymerases?
A. It has ligase ability built in so host enzymes are not needed to seal up breaks in DNA made during replication. B. It manufactures a special tRNA molecule that it uses as a primer to initiate replication. C. It is found exclusively in DNA viruses. D. It lacks normal proofreading ability leading to many errors during replication.
The substrate of an enzyme binds at the
A. active site. B. affinity site. C. reaction site. D. determinative site.
Increasing the resources for one species results in the increase of predator numbers. This reduces the abundance of another prey species. This interaction is
A) indirect commensalism. B) indirect mutualism. C) apparent competition. D) apparent predation.