A Signal Sequence

question 25

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.

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Definitions:

Serratus Posterior Superior

A muscle situated in the upper back that helps in elevating the ribs during inhalation.

Elevate the Ribs

The action of increasing the thoracic cavity volume to aid in inhalation, primarily performed by the intercostal muscles.

Internal Intercostals

Muscles located between the ribs that help with breathing by reducing the space in the chest during exhalation.

External Intercostals

Muscles located between the ribs that help expand the thoracic cavity during inspiration.