BIO 161 Week 4 Lab 4 – Respiration and Fermentation

Name:

Section
Number

Name
of Lab: Lab
4-Respiration and Fermentation

Date
Completed:

Directions:
·
Fill
in the following fields as completely and accurately as possible. Please be sure to practice appropriate grammar,
punctuation, and spelling.
·
When
finished, save your document with a file name that includes your name, section
number, and the assignment (i.e. RoyMason_Lab4_Sect3536.doc). Please only send .doc
or .rtf files. Work submitted in any other
format will not be graded.
·
Attach
your Lab 4, in the assignment section of BB, before midnight on the day it is
due. Late work will not be
accepted.
·We
would like you to time yourself on these labs to see how long it takes you to
work through them. Please take notice of
the time you start your lab and note it down. When you’re completed write the
time lapsed at the top of your answer sheet. ­In the box provided.

Time:

Part 1—Yeast and
Temperature

Observations:
Your observation should be short, 5 or 10 word descriptions of what you see.

Time

Cold

Room Temp

Hot

Initial

5 min

10 min

15 min

20 min

25 min

30 min

Part 2—Yeast and
Energy Source
Observations:
Your observation should be short, 5 or 10 word descriptions of what you see.

Time

Salt

Sugar

Sugar Substitute

Initial

5 min

10 min

15 min

20 min

25 min

30 min

Questions:

1. What is the
difference between a typical
autotroph and a typical
heterotroph? Why is the answer not as simple as “one is a plant and one is an
animal”?

2. Define
metabolism. What would cause an
organism that normally produces ATP by respiration to switch to producing it
by fermentation?

3. In which of your
temperature experiments (Part 1) did the yeast show the most activity? Why,
from a biological perspective, do you think this is?

4. In which of your
energy source experiments (Part 2) did the yeast show the most activity? Why,
from a biological perspective, do you think this is?

5. Based on what you
know about respiration and fermentation, which was happening (respiration or
fermentation) in the bottles? What filled (or should have filled) the
balloons in your experiment?