Although the expression of most genes is tightly regulated, some genes are expressed at roughly constant rates (i. e., constitutively). Which of the following genes would you predict to be constitutively expressed?
A. genes involved in the biosynthesis of tryptophan (an amino acid)
B. genes involved in the degradation of tryptophan
C. genes involved in the degradation of arabinose, a sugar
D. genes that that code for ribosomal RNAs
E. genes involved in the transport of maltose, a sugar, into the cell

The response is ribosomal genes. Ribosomes are cellular structures involved in assembling amino acids to form proteins, it thereby being necessary to generate sufficient ribosomal subunits in order to maintain the protein levels in the cell

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

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