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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 _________.

During translation elongation, one end of the growing polypeptide chain emerges from the ribosome while the other is attached to a tRNA. Which end of the polypeptide emerges?

The information in most genes produces a functional molecule by flowing from DNA to RNA to protein. However, some RNAs do not code for a protein and instead are themselves functional molecules. What is the most general term for RNAs that do NOT code for a protein?

What is the function of an aminoacyl-tRNA synthetase?