A protein that initiates gene transcription and allows for non-glucose molecules to be used is
A. promoter.
B. CAP.
C. repressor.
D. operon.
E. operator.
Answer: B
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Why does ice float in liquid water?
A) The high surface tension of liquid water keeps the ice on top. B) The ionic bonds between the molecules in ice prevent the ice from sinking. C) Ice always has air bubbles that keep it afloat. D) Stable hydrogen bonds keep water molecules of ice farther apart than water molecules of liquid water. E) The crystalline lattice of ice causes it to be denser than liquid water.
Place the following cells in order from greatest to least phagocytic activity: neutrophils, eosinophils, macrophages.
A. Macrophages, neutrophils, eosinophils B. Neutrophils, macrophages, eosinophils C. Macrophages, eosinophils, neutrophils D. Eosinophils, macrophages, neutrophils E. Neutrophils, eosinophils, macrophages
Which of the above letters represents the brain or
controlling system of nerve reactions in this organism? a. A b. B c. C d. D e. none of these
Below is a diagram of DNA replication as currently believed to occur in E. coli. Arrows start from numbers and end at specific points. Answer the questions relating to the locations specified by the numbers
(1 ) Which end (5' or 3') of the molecule is here? (2 ) Which enzyme is probably functioning here to deal with supercoils in the DNA? (3 ) Which enzyme is probably functioning here to unwind the DNA? (4 ) Which nucleic acid is probably depicted here? (5 ) What are these short DNA fragments usually called? (6 ) Which enzyme probably functions here to couple these two newly synthesized fragments of DNA? (7 ) Is this strand the leading or lagging strand? (8 ) Which end (5' or 3') of the molecule is here?