BCH4024 Sp25 OC E4 Q34: A DNA fragment containing the gene D…

BCH4024 Sp25 OC E4 Q34: A DNA fragment containing the gene DRDOOM was isolated from a eukaryotic cell. This DNA fragment was mixed with mRNA expressed from gene DRDOOM. This mixture was heated up and cooled to room temperature to allow the two nucleic acids to anneal. An image of this DNA-RNA sample was then obtained by electron microscopy. The figure below summarizes the basic structural features of the observed double-stranded mRNA-DNA. Based on the figure, the top strand must be _______________. The arrow is pointing to a(n) _____________.

BCH4024 Sp25 OC E4 Q40: You are given tetracycline as a trea…

BCH4024 Sp25 OC E4 Q40: You are given tetracycline as a treatment for a bacterial infection. In the bacterial cells, tetracycline inhibits binding of charged-tRNA to the A site of a ribosome. In this situation, what is bound in the A, P, and E sites of the ribosome?

BCH4024 Sp25 OC E4 Q42: Peptide sequencing analysis of the g…

BCH4024 Sp25 OC E4 Q42: Peptide sequencing analysis of the gene products of a wild-type and a mutant bacteria strain reveals that these strains express different versions of a particular protein, protein P. Portions of the wild-type and mutant sequences for protein P are shown below. The part of the RNA sequence corresponding to this part of the peptide sequence of protein P in the wild-type strain is also shown. Which of the following is the most likely molecular explanation for how the mutant peptide sequence could have arisen based on a change to the wild-type DNA sequence that encoded the protein?