Based on your understanding of the regulation of negative repressible operons in bacteria,  what would you expect to occur if the regulator protein contained a mutation that made it nonfunctional? 

This figure shows the results of a two-dimensional gel that was run to separate the proteins found in a snake toxin. Locate the prominent dark spot in the upper right-hand quadrant on the two-dimensional gel and answer these questions.  Name one thing that you can infer about the amino acid composition of this major spot from the isoelectric focusing direction of the gel?  What is one thing that you can infer from the PAGE direction of this gel about this protein? Image Source: Hatakeyama, D. M., de Morais-Zani, K., Serino-Silva, C., Grego, K. F., Sant’Anna, S. S., Fernandes, W., Aniz, P. A. E. A., Torquato, R. J. S., Tanaka, A. S., Sanz, L., Calvete, J. J., & Tanaka-Azevedo, A. M. (2018). Examination of biochemical and biological activities of Bothrops jararaca (Serpentes: Viperidae; Wied-Neuwied 1824) snake venom after up to 54 years of storage. Toxicon (141), 34–42. Image Description  A two-dimensional Electrophoresis (2-DE) gel showing the separation of proteins. The x-axis represents the pH range from 3 to 10, and the y-axis represents molecular weight from 15 kDa to 250 kDa. Multiple protein spots are visible, indicating their isoelectric points and molecular weights. The label A marks a significant area of interest on the gel. The gradient shading reflects the concentration of proteins, with darker spots representing higher protein abundance.

What can you directly conclude from these results?

C. The scientist identifies a Pribnow box in the molecule. What type of molecule is she examining?

Which of the following sequences best represents the beginning of the mRNA molecule that will be transcribed from this sequence?

Which type of chromosome mutations: Decrease the amount of genetic material in a particular chromosome?  [option1] Increase the amount of genetic material in a particular chromosome? [option2] Increase the amount of chromosomes in a cell?  [option3] Change the position of DNA sequences in a single chromosome without changing the amount of genetic material?  [option4]    

The following four questions (A-D)  are based on the scenario below: A scientist has isolated a molecule of nucleic acid but is unsure whether it is DNA or RNA. She investigates the features present in the molecule to determine its identity. A. The scientist observes that the molecule contains both a promoter and a terminator. What type of molecule is she examining?

The following structure represents part of a macromolecule: This structure represents a  [option1]   A hydrogen is shown in [option2]  [“3”, “2”, “4”, “1”]     A phosphodiester bond is shown in [option3]     If a new nucleotide was added to this molecule, it would be incorporated in [option4]

You are a research assistant in a lab that studies nucleic acids. Your advisor gave you four tubes for analysis. Each of these tubes differs in its contents by the source of its nucleic acids: single-stranded RNA, double-stranded DNA, double-stranded RNA and single-stranded DNA.  The approximate nucleotide base composition of each sample is given in the table below: Which one is/are more likely to be destroyed by DNases?  [option1]        Which one is/are more likely to represent the single-stranded RNA sample? [option2]

Older adult clients may be at risk of abuse because they: