The main form of glucose repression in the lac operon is
A. induction.
B. inducer exclusion.
C. the CAP/cAMP system.
D. repression.
Answer: B
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The fact that the ratio of human male to female births is nearly 1:1 demonstrates that
A. X and Y chromosomes demonstrate independent assortment. B. X and Y chromosomes demonstrate segregation and random fertilization. C. X and Y chromosomes are homologous. D. X and Y chromosomes determine sex. E. All of these choices are correct.
Summarize the process of DNA replication and outline the difference between how each strand replicates
What will be an ideal response?
Foraging bees communicate with other bees in a waggle dance to give information about the food. The important cue in the dance that conveys information about the required flight direction to the food source relative to the hive-sun direction is the
A. angle between the food source and the hive in reference to the sun. B. angle between the waggle run and the vertical axis within the hive. C. angle between the waggle run in reference to the hive-sun angle. D. angle between the waggle run in reference to the direction north from the hive. E. speed of the waggle dance.
The number of named insect species is
a. unknown. b. greater than the combined total of named vertebrates, mollusks, and plants. c. close to 160,000. d. less than 100,000. e. about 16,000.