Exam 2, Part 2


You have 1 hour and 30 minutes to complete this part of the exam.
Write your responses to the questions on the answer sheet provided.
Each response is worth up to 3 points unless otherwise noted.
You may use your notes, any textbooks and the Internet.

All responses must be in your own words, with sources mentioned (no need to formally cite, but do give credit) when applicable. Plagiarism of any kind will be reported to the Lesley University Academic Integrity Committee.

1. Below is a painting by David Goodsell depicting a mycoplasma cell which has a diameter of 0.25µm (micrometers). The orange strands running throughout the interior is DNA. Ribosomes are shown in magenta, while phosopholipids are show in light green.

a. Based on the information presented here, is mycoplasma a prokaryote or eukaryote? Give two reasons why.

b. Mycoplasma can cause illness in humans. If a mycoplasma cell is found by a macrophage (a type of immune system cell), it will be taken into the macrophage to be digested and rendered harmless. What is this process is involved in this phenomenon and what steps are involved?
mycoplasma Continue reading


Exam Review: Cell Biology & the Immune System

The immune system is extraordinarily complex, even when we’re just considering a small injury, but we can start to make sense of what’s going on with material we’ve covered. As a way to prepare for Monday’s exam, try to apply the key terms covered in this section of the course to the video below by Kurzgesagt. If you’d to get to know the immunology as it pertains to skin in more depth, check out the video by Nature also below.

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In Class Mar. 23: cell biology in the news

scisource_bs6014_custom-5b0642ce9e8a3bb9455448dc159e81c4314c9df5-s600-c85 Today we’ll take a brief look at the following recent news stories:

To test your knowledge of cell biology, consider these questions: Are the cells in these articles prokaryotic or eukaryotic? What kind of microscopes are being used to visualize these cells? Which of these cells are motile? What gives them their motility?

Next Week: Exam 2, Community of Scholars Day

community-of-scholars-day-20162-column-header-imageAs we’ve discussed in class, there are a few things to keep in mind for next week.

March 28th: We’re on track to have exam 2 on Monday. This exam will focus on Cell Biology only, and you may use any notes you have taken; you may be able to use the Internet for part of the exam, so you may want to bring a. Since this exam only covers one section of the course, it shouldn’t take as long, and we’ll plan on allotting 2 hours for it. As usual, the best way to prepare for the exam is to test your knowledge with old exams.

March 30th:

  • No class; go to Community of Scholars Day sessions instead. Here are a few suggestions for sessions to attend: Studying the Environment Across Divisions: A Vision of Unity; Trans-disciplinary Approach to Learning Trans-generational Culture: Travel Course Experiences in Japan; Stress and Student Wellness
  • The Protein Perspectives Project is due by 10pm.

Class Prep for Mar. 23: get to know your microbes

Now that you’ve looked at the fundamentals of cell biology, it’s time to go beyond the textbook and consider the bacteria that live in and on us. For class on Wednesday March 23th, watch this TED talk by Rob Knight and work through the items below.

  • Jot down three specific takeaways in your notebook.
  • Consider the image of “microbes” found in the gut shown at 1:15. What kind of microscope was used to produce this image? Why does it have color?
  • How are microbes in the human microbiome identified and characterized?
  • According to Rob Knight, how many “human” cells make up a typical person’s body? How many “other” cells are there?
  • What happens to many children who are given antibiotics within 6 months of birth?
  • What connection (even if only speculative) can you draw between this talk relate to the probiotic items in the recent class discussion post?

In Class Mar. 21: a rendition of the plasma membrane

For this activity, we’ll need 8 volunteers:

  • 6 of you will each be a phospholipid with your hydrophobic arms held out in front of your hydrophilic torso;
  • 2 of you will each be a protein with your hydrophilic arms extended out to the sides of your hydrophobic torso.

And you’ll do two things:

  1.  First, phospholipids, how will you arrange yourselves together if you’re in an aqueous environment (i.e. surrounded by water molecules)?
  2. Proteins, how will you situate yourselves relative to these now nicely arranged phospholipids?

Did this work out as planned? Hit the “Read More” link to find out.  Continue reading