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bronzebadger655Lv1

29 Sep 2019

8. Three things can happen to a photon of light when ithits a molecule. What are they?

9. What special molecule evolved in the photosyntheticautotrophs that has never appeared inheterotrophs? Hint: This molecule is has agreen color!!

What can this molecule do? Bespecific!

What arrangement inside the chloroplastallows for a large surface area for the light dependent reactionsof photosynthesis? Name the part of the chloroplastinvolved.

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esskeetitLv10

21 May 2023

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Deanna HettingerLv2

29 Sep 2019

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Question 1 The membrane structures inside the chloroplast are called the ______, while the fluid surrounding the stacks of membrane is called the ______.
a. stroma; thylakoid
b. thylakoid; cytosol
c. thylakoid; stroma
d. thylakoid; matrix
e. matrix; thylakoid

Question 2 What is considered the ultimate source of energy for living things on Earth?
a. the sun
b. electrons
c. green plants
d. oxygen
e. ATP

Question 3 Why do most plant leaves appear green?
a. They contain a lot of starch which has a green color.
b. They have chloroplasts which absorb green light for photosynthesis.
c. During the light reaction phase carbon dioxide is converted to oxygen which emits green light.
d. They have chloroplasts which absorb all colors of light except for green, which is reflected.
e. During the dark reaction phase water is converted to oxygen which emits green light.

Question 4 Plants perform only photosynthesis, not respiration. True False

Question 5 What is the primary purpose of the light reactions of photosynthesis?
a. to create oxygen gas
b. to produce glucose
c. to convert solar energy to chemical energy (in the form of ATP and NADPH) to power the dark reactions
d. to remove carbon dioxide gas from the atmosphere
e. to create water

Question 6 The light dependent reactions occur in the:
a. mitochondrial membrane.
b. mitochondrial matrix.
c. stroma.
d. thylakoid membrane.
e. cytosol.

Question 7 The energy to run the dark reactions of photosynthesis is produced _________.
a. by the CO2 initially used in the dark reactions.
b. during glycolysis
c. during the light reaction phase
d. during the Krebs cycle
e. during anaerobic respiration

Question 8 Which of the following substances could be totally eliminated and not interfere with the process of photosynthesis?
a. O2
b. H2O
c. light
d. CO2

Question 9 What product(s) do plants produce during photosynthesis that is/are used by humans and other animals?
a. carbon dioxide
b. carbon dioxide and water
c. glucose and oxygen
d. glucose
e. oxygen

Question 10 Only plants can carry out photosynthesis. True False

Question 11 During the light reactions of photosynthesis, ...
a. oxygen is produced from H2O.
b. glycolysis occurs.
c. the Krebs cycle occurs.
d. CO2 is combined into glucose.
e. ATP is broken down to ADP + P

Question 12 The reactants of photosynthesis are:
a. sugar.
b. sugar and water.
c. O2 and CO2
d. O2 and sugar.
e. CO2 and water.

Question 13 During the dark reaction phase of photosynthesis in plants...
a. ATP is created.
b. H+ ions are moved into the stroma from the matrix.
c. molecules of CO2 are combined into sugar.
d. H2O is split into oxygen and H+.
e. solar energy is converted to chemical energy.

coffeelion96

can you guys help me with my bio lab, please. it will be due tomorrow

PROCEDURE:

- Elodea (an aquatic plant)

- 4 capped test tubes containing 30 ml of phenol red solution each

- beakers

- lamp

- drinking straw s

- aluminum foil

- test tube rack

1. Obtain and number four test tubes of phenol red either 1, 2, 3, or 4 using a wax pencil . Warning: Hold test tubes by their sides and not by their caps. The test tube caps are the â slip cap â type and consequently the glass tube can fall out if not held by hand.

2. Uncap one of the tube s and pour its contents into a small beaker. B low into this liquid using a drinking straw until its color changes to a yellow - pale orange. Return the liquid back into this tube and recap . Repeat with the other 3 test tubes.

3. Stuff a large piece of fresh Elodea into Tubes 2 and 4. Fresh Elodea are a brighter green and bushier than older Elodea .

4. Cover Tubes 3 and 4 with aluminum foil so that no light can enter.

5. Place entire rack containing four tubes under a bright lamp , positioning the neck of t he lamp so that it gives maximum exposure . Light should only penetrate the uncovered tubes (1 and 2).

6. Be sure each tube is tightly capped.

7. Observe tubes 1 and 2 throughout the lab period . After 9 0 minutes have passed , remove the aluminum foil from 3 and 4 and observe.

8. Record your observations in the table below.

9. When everyone in your group has recorded the results, clean up by pouring the liquid from the tubes into the waste disposal container and putting the Elodea into the red biohazard waste cans. R ub the wax pencil markings off with a paper towel, rinse the tubes and leave them by the sink. Thanks!

RESULTS:

tube#	description	color at 0'	at 90'
1	light	yellow	yellow
2	elodea, light	yellow	magenta
3	nothing	yellow	yellow
4	elodea, no light	yellow	organe

. Why does the color change you observed in some of these tubes occur?

7. What do you think would happen to the tubes if they were allowed to sit overnight just as they are at the end of this experiment but with the lights turned off?

8. Why do you expect this to happen? (HINT: What other process goes on in cells that requires oxygen and produces carbon dioxide?)

This is a confocal microscopy class. So please answer clear and detail according to the subject. Thank you

1.Explain how light diffraction causes the lateral point spread function of light as shown by Airy. Illustrate with a diagram of the PSF in the lateral direction.

2.What is the relative size of the point spread function in the vertical compared to lateral direction and how does this affect the shape of the voxels we record in a optimal resolution z-stack.

3.Is the point spread function wider or narrower with large aperture lenses? Explain why.

4.Does a larger aperture lens have higher resolution (more detail) or lower resolution (poor detail)? Or is aperture size unrelated to resolution?

5.Definedynamicrange.Explaintheimportanceofadjustingthedynamicrangeof the light intensity sensors (PMTs) and how the confocal encodes intensity into numbers.

6.Explain the advantage and disadvantage of frame-averaging.

6b.Explain how to optimize the resolution of your scanned image to avoid oversampling and minimize file size.

7.Make a list of the most functionally-important parts inside of the scan head box and briefly explain what each part does. Hint1: there are 5 kinds of things, and the AOTFs & lasers are not in the scan head box. Hint2: Without these 5 things, it would not be a laser scanning confocal microscope.

8.Explain why immersion oil is used for some lenses. Explain how it works.

9.Explain the relationship between the point-spread function and super-resolution.

10. What is chromatic aberration?

11. How does one detect cross-talk and bleed-through? How can you avoid it, and how can you correct for it if you could not avoid it?

12. Describe the three main ways to manage autofluorescence.