A mutation in the gene for lac repressor that makes the repressor unable to bind the lac Operator will result in:
A: inability of E. coli to make b-galactocidase
B: constant synthesis of b-galactocidase in E. coli cells
C: continual transcription of all three structural genes of the lac operon
D: both 2 and 3.
Answer: D: both 2 and 3.
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Unlike other gymnosperms, gnetophytes have which of the following?
a. vessel elements in their xylem b. separate male and female gametes c. seeds exposed on modified leaves d. small spores that germinate
Aerobic respiration became established as a result of the evolution of ____
a. the first protocells b. the first true cells c. metabolism d. the nuclear envelope e. the oxygen-producing pathway of photosynthesis
Part of the reason why salt dissolves in water is due to the formation of hydrogen bonds between water molecules and chlorine ions.
a. true b. false
Oxygen-poor blood is carried from the heart of a mammal to the lungs via the
A) pulmonary arteries. B) pulmonary veins. C) superior vena cava. D) inferior vena cava.