Saturday, October 10, 2020

Online and in-person lab design exercise using yeast.

Because my AP Biology classes this year are a hybrid model in which students can move back and forth from remote to in-person instruction based on their circumstances, I needed to design labs that were portable and could be completed in the home lab (kitchen). In order to teach experimental design, I developed a mini-unit using yeast (Saccharomyces cerevisiae).  Much of the work can be done asynchronously.

The introduction to the module sets the stage.

u9lawXdqXHwDbdMlmaBqd7so7zKZ3DdyxGZ6u-kNAbpheK0USMtvDI9ZrHkooXbr-YZxpP6zYM63sl1k6dP0j_vVJmAy3x0moyMxSlt-hYYgcqNjr5Ui_8hAaTUryc8TZT632V5l

 

Figure 1. Tyson on Curiosity



Science is about asking questions of the world.  It is how we get a clue.  Although there are many ways to “do science” including observational studies and case studies, the hypothetico-deductive method is the most well known and is often referred to as “The Scientific Method”.  In reality, science is never done in the step-by-step method often described in science classes.  With that said, it is vital that you learn how to create testable hypotheses, to design and conduct controlled experiments and to use mathematics (statistics) to test your hypotheses.  In this exercise, you will do all of these on a small scale so that you can use it as a model for the research project that you will design, conduct, and present at the research exhibit in April.


Next, students participate in an online forum discussion about the following objectives.



I provide them with a pacing guide to help organize their work:



They then need to get up to speed by reading some background material and choosing videos from a playlist. Here is a copy of the document.

Students choose three the following to watch or read.

Title with link

Notes

Format

Cellophane method

Measure the size of foam

Watch

Balloon method

Measure the size of balloon

Watch

Submerged pipette method

Small scale, count the bubbles

Watch

Mass method

Precise, but needs scales

Watch

Syringe method

Good background information

Read

Inverted tube method

Accurately measure volume of gas produced

Read

Students then design their own experiment based on the methods presented in the playlist. Here is a document I wrote to help them with the essentials of experimental design.

Next, students propose their designs to their classmates and get feedback. At this point, I encourage them to join with other students with similar designs. They revise their experiments, conduct them, collect results, analyze and present them in a Flipgrid presentation that I grade.


Wednesday, September 30, 2020

Dale Muzzey Animations, Antibody Diversity Video and Edpuzzle

 Dale Muzzey has made many useful and beautiful animations over the years.  Much of his content is available at Biovisions at Harvard.  Many of the animations were made in Shockwave Flash, which is no longer supported.  One of my favorite is a Flash animation on antibody diversity.  Here is a youtube recording of the animation.



I turned this into an Edpuzzle to make it more interactive for my students.


If you like the materials I shared here, you might be interested in my book of 600 AP Biology questions and answers.

Tuesday, September 22, 2020

How to answer free response questions on the AP Biology Exam

For students: 
Below are two edpuzzles that will help you learn how to answer AP Biology free response questions. I've been grading the exam every year since 2003 and have read tens of thousands of essays over the past 17 years (85,000 is my best guess). If you follow my method for answering questions, you will do well on the exam. I strongly encourage you to visit AP Central, the College Board's website.  You will find past exam questions that you can use to practice on.

For Educators: 
Our school is currently teaching on a blended, hybrid style in which students may choose, on a day-to-day basis, to be in-person or remote. When in person, we wear both masks and face shields. Obviously, this kind of teaching demands significant flexibiltiy. I played with EdPuzzle for years and have found it to be particularly useful now. In this post, I share two EdPuzzles that I made to teach students how to answer long and short free response questions. Feel free to use with attribution.


If you like the materials I shared here, you might be interested in my book of 600 AP Biology questions and answers.