A signal sequence is a short sequence of amino acids at the beginning of a protein that directs it to a specific location in the cell, such as a membrane or organelle. Answer: E Proteins synthesized on free ribosomes do not have signal sequences, as they are intended for use in the cytoplasm rather than being transported to a specific location in the cell.

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A Signal Sequence

Question 45

Multiple Choice

A signal sequence

A) directs RNA nucleotides to a particular gene.
B) attracts tRNAs to an mRNA.
C) is the first part of a protein's amino acid sequence that helps to direct it to a certain part of the cell.
D) is a coding codon that mutates into a stop codon.
E) is part of proteins that are synthesized on free ribosomes.

Correct Answer: