Blog

A particular gene in Drosophila is essential for proper embryonic development. However, it is not active in embryonic cells at all times during growth. The Western (protein) and Northern (mRNA) blots below show expression of this homeotic gene at various points during development in drosophila. This will tell you if the mRNA (Northern) and/or the protein (Western blot) are expressed in the egg or embryo at any given time.  The entire embryo was used to obtain protein (Western blot) or mRNA (Northern blot). (Embryo age = hours) The gene above is an example of what type of early developmental factor?

Below is the mutation in the limb enhancer for sonic hedgehog and the phenotype to which it leads….  Be sure to answer all 3 parts and clearly label each part of the answer. Part 1:  What is the normal role for sonic hedgehog during anterior-posterior axis patterning of the limbs (2 pts)? Part 2:  Based on the figures above, describe how this mutation can lead to such a dramatic alteration.  Your description should:   1) indicate if the mutated region of the enhancer is normally an activator or repressor of Shh and a brief description WHY you say this, and 2) include a description of how this nucleotide mutation change alters gene expression in this manner.  (4 points) Part 3:  Sonic hedgehog is a very important morphogen during development of many tissues.  Briefly describe why this particular mutation does not affect the overall health of the organism beyond the limb phenotype shown (3 points)  

The following table shows the tax base and total tax for two tax base levels of a hypothetical tax system: If the tax base is: The total tax is: $35,000 $2,100 $85,000 $6,800 This hypothetical tax system represents what type of tax rate structure?

DirectionsPlease answer the following two essay questions below with a one-paragraph essay for each. Your essay should include a thesis statement with a clear argument, several body sentences that answer all of the questions and provide facts to support your argument such as the names of key historical figures and dates, and a concluding sentence. You do not need to bring in any supporting sources or citations from the textbook or other readings. You may not use AI or AI-enhancement for this essay test. This test should be completed independently, without notes or outside resources. You will be able to choose for each essay question. Please only answer one question from each selection.

Answer all questions in the exam document embedded below. After you completed your exam, scan your pages into a single PDF, name it Midterm1_StudentName (example: Midterm1_JohnSmith.pdf).  Before uploading, verify your file has all the pages you need to submit. Upload it by clicking on “Choose a File” button in “Question 1” below. You are only allowed to upload one file to a question. Then click “Submit Quiz”. You may get a warning saying that you have some unanswered questions if you do not use optional file upload sections, click OK to submit anyway. View exam document here. Use double-sided arrow icon on the tool bar below to preview it in full screen mode. You can also download it and open it on your computer

A prokaryotic organism that lives in a pure salt environment would be a member of which Domain?

Firms working together to integrate components of a supply chain is known as ________ 

Customer relationship management (CRM) systems are designed to enable information sharing among customers, sales team members and operations management employees.

Explain why the genetic code said to be degenerate?

A change in one or more characteristics of a population that is heritable and occurs from one generation to the next is called ___________