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Biology 1 > Quiz 6 > Flashcards

Quiz 6 Flashcards

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1
Q

What is the reaction of Photosynthesis?

A

6H2O + 6CO2 —-> C6H12O6 + 6O2

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2
Q

What are the two major steps in Photosynthesis?

A
  1. Light Dependent Rxns
  2. Light Independent Rxns
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3
Q

Define Light Dependent Rxns

A

energy from light is captured and used to create ATP and NADPH

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4
Q

Define Light Independent Rxns

A

ATP + NADPH + CO2 to make sugar

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5
Q

Who does Photosynthesis?

A

Plants, Algae, Photosynthetic Bacteria, and Cyanobacteria (blue green algae)

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6
Q

What is light?

A

ELectromagnetic energy traveling in packets of energy (Photos) that move in waves - wavelengths 400nm->740nm.

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7
Q

What does wavelength equal?

A

1/frequency

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8
Q

For a Photo of Light to serve as an energy source, it must what?

A

It must strike an electron in a Photosynthesis pigment molecule.

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9
Q

The electron is reflected if?

A

The frequency of the Photon does not equal the frequency of the electron.

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10
Q

The electron is absorbed if?

A

The frequency of the Photon = the frequency of the electron. This generates a high-energy excited electron.

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11
Q

What are some Photosynthetic Pigments?

A
  1. Bacteria Chlorophyll
  2. Chlorophyll A, Chlorophyll B, C, D
  3. Carotenoids - Carotine
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12
Q

What is Absorption Spectrum?

A

Wavelengths of light that are used by a specific pigment.

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13
Q

What is the Action Spectrum?

A

A curve depicting the amount of different wavelengths of light absorbed by a particular substance, a-pigment (rate of photosynthesis)

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14
Q

Where is the Light Dependent Rxn (LDR)?

A

On the Thylakoid membrane or on the membrane of Prokaryotes.

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15
Q

What do the thylakoid and prokaryote membranes contain?

A

Photosystems

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16
Q

What are photosystems?

A

Clusters of photosynthetic pigments imbedded in a T.M.P.

17
Q

What does the Antenna Complex do?

A

It captures light energy and transfers it to Rxn Center Chlorophyll. It is composed of different photosynthetic pigments.

18
Q

What does the Rxn Center Chlorophyll do?

A

Generate excited electrons.

19
Q

What are the 3 known photosystems?

A
  1. P870 (Photosynthetic Bacteria)
  2. P680 (Eukaryotes and Cyanobacteria)
  3. P700 (Eukaryotes and Cyanobacteria)
20
Q

What are the two versions of LDR?

A
  1. Cyclic Photophosphorylation
  2. Non-Cyclic Photophosphorylation
21
Q

Who undergoes Cyclic Photophosphorylation?

A

Photosynthetic Bacteria

22
Q

What is the process of Cyclic Photophosphorylation?

A
  1. Light strikes the antenna complex of P870
  2. Energy is absorbed and transferred to RCC, generating a high-energy excited electron.
  3. ETC takes the electron to a low energy state on P870.
  4. Energy pumps H+ across the membrane, generating a Proton Motive Force.
23
Q

Who undergoes the Non-cyclic Photophosphorylation?

A

Eukaryotic, Cyanobacteria (blue green Algae)

24
Q

What is the process of Non-cyclic Photophosphorylation?

A
  1. Light strikes A.C. in P680
  2. Energy transfers to RCC
  3. RCC produces 2 excited e-, going to E.T.C.
  4. ETC transports e- to low energy state on P700
  5. Energy used to split H2O.
25
Q

Where does the original source of e- come from in the Non-Cyclic Photophosphorylation?

A

Splitting H2O.

26
Q

What are some differences from Cyclic and Non-Cyclic?

A
  1. Non-Cyclic uses oxygen, Cyclic doesn’t
  2. Non-Cyclic has an enzyme to split water
  3. Non-Cyclic has NADP reductase NADP+ + 2e- —> NADP- + H+ —> NADPH
27
Q

What is the Great Oxidation Event?

A

All Eukaryotes cannot exist without O2. Cyanobacteria cause great Oxygenation since they undergo photosynthesis and put oxygen in the atmosphere.

28
Q

How old is the planet?

A

4.5 BYA

29
Q

When were Cyanobacteria first present?

A

2.7 BYA

30
Q

When was life first present?

A

3.3 BYA

31
Q

When was the first fossil evidence of Eukaryotes?

A

2.2 BYA

Biology 1 (15 decks)

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