Question

use the rubric on the bottom to grade this students response to a test question: describe the parts and process of making and exporting a protein? justify the grade you gave student response: proteins are made and exported from the cell by a series or organelles. first the nucleus does something. then ribosomes build the proteins. these proteins are then sent to the golgi apparatus where they are labeled and packaged for delivery. they eventually arrive at the cell membrane where they are passed into the intracellular fluids and blood.

Explanation:

The student's response is missing details about the nucleus's role (it should mention DNA transcription and mRNA production). Also, the final destination is incorrect (proteins are exported to extracellular fluids, not intracellular). Using the rubric:

• Parts of the system: The main parts (nucleus, ribosomes, Golgi apparatus, cell membrane) are mostly there. But the nucleus's function description is too vague (like "does something"). If we assume the basic organelles are named (nucleus - even with vague function, ribosomes, Golgi, cell membrane), maybe one part (in terms of proper function description for nucleus) is “missing” in a sense of proper detail. So for parts of the system, it could be \(2\) points (one part - nucleus's function - is not well - described, similar to “missing” a proper functional part description).
• Order of parts: The order (nucleus - ribosomes - Golgi - cell membrane) is correct. So \(3\) points for order.
• Function of the parts: Ribosomes (build proteins) and Golgi (label and package) are correct. The nucleus's function is wrong (just “does something” instead of transcription etc.), and the final destination (intracellular is wrong, should be extracellular). So two organelles (nucleus and cell membrane in terms of function) have wrong or missing functions. So \(1\) point for function.

Answer:

Total score: \(2 + 3+1=6\). But since the rubric might sum differently (if each category is weighted equally, say each category is out of \(3\) points), and if we assume each row (parts, order, function) is a separate \(3 -\)point category. However, if we consider a simple sum (assuming each cell in the rubric row is a point for that row):

• Parts of the system: \(2\) points (using the “one part missing” as \(2\) points in the rubric row)
• Order of parts: \(3\) points
• Function of parts: \(1\) point

Total score: \(2 + 3+1 = 6\). But if we assume each row is a \(3 -\)point category (and we take the highest non - perfect score in each row as per the rubric description), for parts of the system (assuming the student named the organelles but with a flaw in nucleus function - so \(2\) points), order (\(3\) points), function (\(1\) point). If we assume a \(9 -\)point total rubric ( \(3\) per category), the score is \(6\). But if it's a \(3 -\)point overall score (summing the best - fit per row where each row's score is \(0 - 3\) and total is \(3\)), and if we weight each row equally (parts, order, function each \(1\) point towards the total \(3\)):

• Parts: \(2\) (out of \(3\) in its row) - take \(1\) (since \(2\) in the row is better than \(1\) but not perfect)
• Order: \(3\) (out of \(3\) in its row) - take \(1\) (as it's a third of the total \(3 -\)point score)
• Function: \(1\) (out of \(3\) in its row) - take \(1\)

Total score: \(1+1 + 1=3\) (This is a more likely interpretation if the rubric is a \(3 -\)point total, with each row contributing \(1\) point to the total \(3\) when we take the best - fit score per row and map it to a \(1 -\)point contribution for each row to the total \(3\)). So the grade is \(2\) (if parts \(2\), order \(3\), function \(1\) and we average or sum in a \(3 -\)point scale: \(\frac{2 + 3+1}{3}\approx2\) (rounded to the nearest whole number as per typical grading). So the grade is \(2\)