The early Earth's reducing atmosphere probably contained all of the following except
A. water.
B. hydrogen sulfide.
C. carbon dioxide.
D. oxygen.
E. methane.
Answer: D
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Transcription of the lac operon is most efficient when ____
a. cAMP levels are low b. the CAP site of the promoter is not bound to cAMP c. glucose is present and lactose is absent d. lactose is present and glucose is absent e. lactose and glucose are present
Liz has two sons and two daughters, and she is heterozygous for hemophilia, an X-linked condition. Which of the following will likely occur?
a. Liz will pass the disease to both sons. b. Liz will pass carrier status to one daughter. c. Both of Liz’s daughters will be hemophiliacs. d. All four of Liz’s children will have carrier status.
Which of the following structures is not part of an operon?
A. structural gene B. operator C. regulator gene D. promoter E. All of these are part of an operon.
Polyploidy is
A. common in plant species. B. common in fungal species. C. common in animal species. D. common in bacterial species. E. All answers are correct.