In an electrically neutral atom of any element, there are equal numbers of A. protons and neutrons
B. electrons and neutrons
C. electrons and protons
D. atomic number and atomic mass

Is it A. ?

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.

Ineed to know why d is the correct answer asap

What does natural resource management aim at ?