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Identify the order of the steps to assemble a GTAW torch.

A technique used at the end of a weld is to reduce the current using the foot pedal.

The face of a completed fillet weld should be flat or slightly convex.

Where in the weld pool is the filler metal added?

In GTAW, the welder has greater control of the weld pool than in other arc welding processes.

The purpose of a gas lens is to make the shielding gas exit the nozzle in a column.

Pulsed arc does not provide time for the weld pool to cool and thus should not be used.

Filler rod may not be required when welding a lap joint on thin metals.

In this schematized replication fork, lines “a” and “b” represent the newly synthesized strands of DNA. Which of the following statements correctly describes strand “b”?

Afterforming a peptide bond, a ribosome translocates along an mRNA to access the next codon. During the translocation, the tRNA that just became attached to the growing polypeptide chain _________.