Blogging My Biology Class 20080924

Biology, Eighth Edition, by Campbell & Reece, et al.

Biology, Eighth Edition, by Campbell & Reece, et al.

My notes and thoughts from Biology 111, for Wednesday, September 24, 2008. The entire series can be found here.

Forgive the delay in this, the next installment of the series. At about this point in the semester, the workload and involvement in school just took off, and I needed to devote as much time as possible to homework and studying.

When last we left off, we had just begun a quick tour of the eukaryotic cell and its structures. We’d gone over the Nucleus and the Ribosomes, and some of the membrane-bound organelles like the Endoplasmic Reticulum (or ER), the Golgi Apparatus (or GA), and the Lysosomes.

We’ll pick it up here with number 7, the Mitochondria (another membrane-bound organelle), and we’ll go into more depth when we get to Chapter 9.

The mitochondria are sites of aerobic respiration. Recall that C:H bonds have a high potential energy because of the maximum distance of electrons from the nuclei of the Carbon and Hydrogen atoms. In other words, the electrons they share equally are midway between the C and the H.

(The lecture notes continue below the fold.)

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Blogging My Biology Class 20080922

Biology, Eighth Edition, by Campbell & Reece, et al.

Biology, Eighth Edition, by Campbell & Reece, et al.

My notes and thoughts from Biology 111, for Monday, September 22, 2008. The entire series can be found here.

Before we get to the actual lecture, there’s something I need to address here.

While taking notes, it is often helpful and even necessary to draw little diagrams and pictures, many of which I reproduce in this series by digital means.

This is often simpler, neater, and more helpful than just scanning pages of notes from my notebook.

Until now, it’s really not made much of a difference, but in this lecture we begin drawing diagrams of cell structure, and while it’s not terribly difficult to do digitally, when drawing them in a notebook it is imperative for accuracy to understand the proper method for drawing a cell. It is a skill which requires a great deal of practice.

Chromosomes and various proteins for example, can be very complicated, and drawing them incorrectly can lead to gross misunderstandings and disaster for the student. To help prevent this, I’ve created a digital animation of the proper method for drawing a chromosome inside a prokaryotic cell. The method employed here can be extended and extrapolations to eukaryotic cell diagramming should not be difficult.

The method, along with this lecture, is below the fold.

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Blogging My Biology Class 20080919

Biology, Eighth Edition, by Campbell & Reece, et al.

Biology, Eighth Edition, by Campbell & Reece, et al.

My notes and thoughts from Biology 111, for Friday, September 19, 2008. The entire series can be found here.

As we took our first exam on Wednesday, September 17, there was no lecture for that day.

We took the first part of class to go over the exam results. I had left the exam feeling very good, figuring I was unsure about and may have missed two or three questions. Turns out, I missed eight.

Damn.

Out of 64 students in 3 sections, the highest score was a 91, the lowest a 29, and the median 67. I scored an 88.

Doc said not to sweat it too much, as the first exam is the one everyone does a little less well on, unfamiliar territory, etc., and he drops the lowest exam score.

I was rather surprised at about 5 of my 8 incorrect answers, thinking to myself, “What the hell were you thinking???? You know better than that!!!” I really pulled some dumb answers from out of my butt to very simple answers.

One of my incorrect answers though, was the molecular formula of maltose (two glucose molecules bonded together). Now, without thinking, I simply answered with double the formula of glucose, stupidly forgetting to subtract the water molecule from the hydrolysis synthesis that is required to form maltose from two glucose molecules (or any disaccharide from two monosaccharides).

Hence the unforgettable graphic I made subsequently. After making that animation, I will never repeat that mistake.

After going over the exam, we moved on to Chapter 6 – A Tour of the Cell.

Notes for that brief lecture are below the fold.

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