Warm Up 5 is due
Wednesday February 18, 2004, at 9:30 am
at the lecture notes and do the readings before (or while) doing the Warm
Up. You may need to look terms up in the book's glossary or on the CD (or
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Class Section (1, 2 or 3):
(See Oncourse to determine whether you are in 1= A410, 2 = A411, or 3 = A413)
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The following three questions refer to material
you were to read in preparation for class. These questions require you to
write a three or four sentence response. It is OK to answer 'I don't know'
- but STATE WHY you are confused! (Don't just say 'I don't know' - you probably
DO!) Each WarmUp worth 3 points if answered on time and must be submitted
via the web. See notes page for prior Warm Ups and student responses.
QUESTION 1: Take a look at Figure 7.12
in your book (p.121). Normally, the mitochondria breaks down sugar (carbohydrate)
fragments during the Krebs Cycle and makes ATP energy for cells. If a person
is in the extremely low-carb induction phase of an Atkins
diet, they are eating lots of protein and fat, and almost no sugar.
Yet, the Krebs cycle is producing plenty of ATP energy. Explain how the mitochondria
makes ATP energy, even in the absence of sugars, based on Figure 7.12.
QUESTION 2: Anemia
is a disease that is caused by abnormally low hemoglobin levels or too few
red blood cells. What do you think happens in the body cells of people who
are anemic that makes them feel tired and weak?
Please read the notes on cellular respiration before answering this question!
QUESTION 3: In the absence
of oxygen, yeast cells are able to partially break down sugars, through a
process called fermentation. When allowed to
ferment sugars in a closed container, the yeast will produce a waste product
called ethanol (or alcohol). Humans have figured
out how to control this process to make delicious beer or wine. Why do you
think that beer and wine, natural products of yeast fermentation, both have
an alcohol content of ~8-10%? (Why doesn't the alcohol content get any higher?)
QUESTION 4: Optional: What is CONFUSING
to you about photosynthesis and respiration from our lecture material? Any
other comments or questions?
You can change your mind as many times as you like before hitting
Submit. Print this page before submitting if you want to keep a record of
your answers. You will get a confirmation box to let you know that your answers
were submitted, and will return to the N100 main page after submitting.