🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
Biology
5
answers
0
watching
170
views
19 Apr 2019

Why di we try to pack the mud into the bottom of the Winogradsky column with foil?

Watch
5
answers
0
watching
170
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
Already have an account? Log in
Share
Already have an account? Log in
Share
14 Mar 2023
Already have an account? Log in
Share
Already have an account? Log in
Share

Related textbook solutions

Molecular Cell Biology
8 Edition,
Lodish
ISBN: 9781464183393
Biology: Science for Life with Physiology
6 Edition,
Belk
ISBN: 9780134555430
Concepts of Biology
OER Edition,
Openstax
ISBN: 9781938168116
Biology
2nd Edition, 2013
Openstax
ISBN: 9781947172517
Essentials of Biology
5 Edition,
Mader
ISBN: 9781259660269

Related questions

1. Whereas Thiospirillum would ___________, Pelodictyon would__________.
a. be found in region c of the Winogradsky column, be found inregion b of the
Winogradsky column
b. be found in Volume 2 of Bergey’s Manual of SystematicBacteriology, be found
in Volume 1 of Bergey’s Manual of Systematic Bacteriology
c. contain internal sulfur storage granules, form sulfur storagegranules outside the
cell.
d. All of the above
e. A and C

2-The purple nonsulfur bacterium Rhodospeudomonas generallylives
photoheterotrophically in the Winogradsky column. Trent isinterested in the resilience of this bacterium and so he take the“time share” Winogradsky column home, agitates it thoroughly andleaves it for several weeks in a dark room. What happens toRhodospeudomonas?
a. The cells die because they lack an energy source.
b. The cells become colorless and livechemoheterotrophically.
c. The cells form endospores.
d. The cells begin to employ anaerobic respiration.

3-Just then, Nikki and Jeslyn spy some tourists who have arrived atlower geyser basin in a snow coach. Some of the tourists havejumped out and begun drawing in the microbial matt with sticks.Nikkie and Jeslyn decide to educate these tourists about themicrobial composition of the area. All of the following are thingsthat they might tell the tourists EXCEPT
a. Certain microoroganisms in this area produce enzymes that enableamplification
of DNA.
b. Some of the bacteria in this area are capable of converting N2gas to ammonia.
c. Some of the bacteria in this area may form resting structuresthat are resistant to
desiccation.
d. Many of the bacteria in this area are oxygenic phototrophs andthus they provide
the O2 that we need in order to breath.
e. The bacteria that comprise this matt are in the genusNitrosomonas and they are
nitrite oxidizers.

4. While Nikki and Jeslyn are talking with the tourists, Kyle andAaron seize the moment to take a small sample of the microbial mattfrom the stick the tourists were using. They know they will be ableto isolate the enzyme nitrogenase from this sample.Nitrogenase
a. would be most active in oxygenic phototrophs when photosystem IIis being used.
b. would be more active in Nostoc heterocysts than in other cellsof a trichome.
c. would be more active in cells in the upper 1/8th inch of themicrobial mat in
Yellowstone’s upper and lower geyser basin.
d. synthesizes starch in akinetes.

5. Rather than traveling to snowy Yellowstone, Kristina, Courtneyand Sarah N. have
decided to travel to the Utah Canyonlands to observe thecryptobiotic crust. In Arches
National Monument, they see some tourists “busting the crust”. Theystop the tourists and explain that all of the following areimportant functions of the crust EXCEPT
a. “The anoxygenic phototrophs within this cryptobiotic crustconsume toxic gases
(such as H2S) from our atmosphere thus reducing environmentalpollution.”
b. “When it rains, the cyanobacteria in that crust swell and takeon water which
benefits everything in the soil.”
c. “The cryptobiotic crust (that you just stepped on) preventserosion.”
d. “The cyanobacteria within this crust “fix” nitrogen thus formingforms of nitrogen
upon which all life depends.”

In the rate of oxygen synthesis in elodea experiment, why did the solution in the tubing move upward in the volumeter when exposed to light? Why did the solution in the tubing move downward when covered with foil?

Thus, three factors, namely light, carbon dioxide, andchlorophyll, are considered important in determining the rate ofphotosynthesis. We will study in this lab how each of these factorsinfluences the photosynthetic process.


A. Carbon Dioxide

Objective: To demonstrate that C02 is utilized in thephotosynthetic process.
Procedure:

1. Fill 2 test tubes 1/4 full with Bromthymol Blue.
a. TT#1 - add 1 drop of HCl; record the color change
b. TT#2 - add 1 drop of NaOH; record the color change

2. Place 100 ml Bromthymol Blue in a small beaker and blow into ituntil a color change appears. Divide this solution equally into 4test tubes and number the test tubes.
a. TT#1 - Blank.
b. TT#2 & #3 - Place 1 healthy green Elodea twig (of the samesize) in each.
c. TT#4 - Control.
d. Wrap TT#3 & #4 completely with aluminum foil (to cut offlight).
e. Place all 4 test tubes near a light source, equal distances away(but away from the light source to be used in Part B).
f. Remove the foil at the end of the lab period. Record the colorchanges and infer their significance.

Data:

Test Solution Color of Bromthymol Blue

HCl yellow

NaOH dark blue

CO2 (bubbled through)

Test Tube Color Before Color After
#1 yellow yellow

#2 yellow green blue

#3 yellow light green

#4 yellow yellow

Question 1. Which of the testtubes changed color? Why? (explain thecontrols)


Weekly leaderboard

Home
Homework Help 3,900,000
Biology 460,000
Start filling in the gaps now
Log in