Which of the following choices describes a function of the plasma membrane

synthesizing proteins
controlling the passage of various molecules
separating the interior of the cell and exterior of the cell
receiving cell signals

The trp operon in e.coli regulates genes that code for enzymes required for synthesis of the repressible operon. when tryptophan is not available amino acid tryptophan. the trp operon is a in the environment, the trp repressor protein activeinactiveregulated. therefore, rna polymerase can bind to the genes to begin transcription.

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How much does one sucrose molecule weigh in grams?