Helicases are crucial to many of the molecular biological processes we have learned about in this class. Briefly (2-3 sentences max), describe what a helicase does and give 2 examples of different processes (replication, repair, transcription, and translation) that helicases are involved in what it does in each process.   A) What does a helicase do?  B) Example 1  C) Example 2

Which of the following DNAs is most likely to contain the recognition sequence for a homodimeric DNA binding protein? (Note that only one strand of the DNA is shown - you will find it helpful to write down the sequence and the sequence of the opposite strand to answer this question.) a) 5’- G A G C G A T C G C T C - 3’ b) 5’- G A G C G A G A G C G A - 3’ c) 5’- G A G C G A A G C G A G - 3’

Shown is a representation of a DNA molecule being transcribed.(a) Identify every 3′ end and every 5′ end in the picture.(b) Identify the template strand.                                                                          (c) The nontemplate strand is also called the “sense strand.” Explain.

A molecular researcher, Dr. Sidra Alkatini, is investigating the manifestation of a disorder in some of her lab mice models, which are lacking production of an important protein necessary for the cellular respiration pathway. The afflicted mice are short lived, and have perpetually low blood glucose levels, no matter how much food they are fed. Through sequencing, the following strand of DNA was produced:                    5’ TTC CAA TTA CGC CGC TAT ACG CGC ACC ATG TTA TCA TGT TGG TGG TAG 3’ Given your expertise in genetics, she contacts you, her BFF, to help her understand the sequence and its relation to the genetic disorder she is seeing.   1)  Now that you have seen the sequence and identified some of the major motifs it contains, what are going to tell Dr. Alkatini about in relation to the genetic disorder she is seeing?   a “Listen, Doc, it is clear there is no STOP signal in the last codon place where it normally should be.” b  “Listen, Doc, the fact…

1) A bacterial chromosome contains 6.4 million nucleotides of DNA. If synthesis at each replication fork occurs at a rate of 1800 nucleotides per second, how many minutes will it take to completely replicate the chromosome with theta replication? 2) What different mRNA sequences can code for a polypeptide chain with the amino acid sequence Met-Trp-Ile? (Include the stop codon)

Plx asap

Each type of molecule listed below is recognized by a specific class of nuclear import receptor (importin) or nuclear export receptor (exportin). For each type of molecule, state whether you think it is recognized by an importin or exportin and explain why (in terms of where that molecule is synthesized, what that molecule does, and where it does it). (a) RNA polyermase II: (b) ribosomal protein: (iii) †RNA:

Compare the process of Replication, Transcription, and Translation by describing the following properties for each: (circle, highlight, bold or whatever mechanism you want to use to indicate your answer)

Cystic fibrosis (CF) is an inherited disorder caused by different types of mutations, many of which prevent ions from moving across cell membranes. Normally there are channel proteins that allow passage of the ions, but in patients with one kind of CF these proteins seem odd. Closer examination shows that these proteins display the correct amino acid sequence. However, they fail to do their job. A) Given that the primary structure of the protein is correct, what can you infer about the DNA sequence for the gene coding this protein on this patient, is there a mutation? Explain. B) Why is the primary structure insufficient to guarantee the proper function of the protein?

All transposons would have these components among A- D EXCEPT A) O transposase |B) O nsertion sequences o O nverted repeat sequences D) O an ori (origin of replication)