Blog

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?

Which is a post-translationalmechanism that can regulate the expression of a gene?

If the protein coding region of a human gene is inserted into a bacterium with appropriate regulatory sequences to get it transcribed and translated, the polypeptide produced will have the same amino acid sequence as is produced in a human cell. What feature of the genetic code makes this so?

Which of the following indicates the relative rates of transcription of the lac operon for E. coli with access to abundant source(s) of the following of sugar(s): lactose only, glucose only, lactose and glucose. To be clear, transcription rates in answers are as highest > intermediate > lowest.