As the two strands of DNA are unraveled, which enzyme relieves the strain on the two strands?
A. DNA endonuclease
B. DNA polymerase
C. DNA exonuclease
D. DNA ligase
E. DNA gyrase
Answer: E
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At any given point along the length of the gill lamella, how does the pO2 of the blood flowing through the blood vessels in the lamella compare to the pO2 of the water flowing over the gill lamella?
A. The pO2 of the blood is lower than the pO2 of the water. B. The pO2 of the blood is higher than the pO2 of the water. C. The partial pressure of oxygen in the blood is equal to the pO2 of the water. D. The pO2 of the blood is variable and cannot be compared to the pO2 of the water. E. The pO2 of the blood never exceeds 50% of the pO2 of the water.
Which of the following is considered a reverse mutation that will restore the wild type phenotype?
A. Mutation to a different base sequence, but one that restores the amino acid sequence in the protein to the wild type sequence B. True reversion back to the wild type base sequence C. A mutation that restores the function of a protein, even though it does not restore the base sequence or the amino acid sequence to the wild type D. All of the choices are correct.
From where does the O2 released during the light reactions of photosynthesis come?
A) C6H12O6 B) H2O C) CO2 D) RuBP E) ATP
For the process of diffusion to occur, molecules must
A. move from areas of low concentration to areas of higher concentration until an equilibrium is reached. B. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached. C. remain stationary until their molecular motion allows for an equilibrium to be reached. D. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached by active transport. E. move from areas of high concentration to areas of lesser concentration until facilitated transport can assist the molecular equilibrium.