Lecture 5 Flashcards
What were the findings of (a) Jan Baptista van Helmont (b) Joseph Priestly, (c) Jan Ingenhousz, (d) F.F. Blackman, (e) C.B. van Niel, or (f) Robin Hill regarding photosynthetic processes?
Jan Baptista - He weighed plants to see if the amount of soil lost was from the plant and this was not true
Joseph Priestly & Jan Ingenhousz worked together - they did experiments using candles, mice, and plants to see what a plant creates and they discovered that the green parts of the plant do go and create photosynthesis and produce oxygen (they discovered the outcome of photosynthesis)
F.F. Blackman - found that capturing photosynthetic energy requires sunlight (you need sunlight to create ATP for light-dependent reactions); he also discovered that enzymes run the show, not sunlight
C.B. Van Niel - decided that photosynthesis splits water molecules, giving us oxygen gas
Robin Hill - he discovered what carbon fixation is (converting Co2 into an organic molecule)
A _________________ is a particle of light that contains energy and the ____________ the wavelength, the greater its available energy. Fill in the blanks.
photon & shorter
A beam of light is able to remove electrons from certain molecules creating an electric current called a ____________________ and it occurs when photons transfer energy to electrons. Fill in the blank.
photoelectric effect
________________ is the range of efficiency of photons a molecule is capable of absorbing. Fill in the blanks.
The Absorption Spectrum
How do you know what colors on the visible light spectrum a plant is absorbing without running any type of experiment? (know what we discussed about reflecting and absorbing wavelengths affecting the color of a leaf)
Because every color is being reflected, then the opposite is being absorbed (If blues and greens are being absorbed, then a reddish color would be reflected)
Pigments are molecules that are good absorbers of light in the visible range. Which pigment within most plants is considered the main pigment that can act directly to convert large quantities of light energy?
Chlorophyll A
According to the video Why Aren’t Plant Black, we know that most plants do not absorb green on the light spectrum. Which statement explains the five hamburger theory which explains why this happens?
According to the video Why Aren’t Plant Black, we know that most plants do not absorb green on the light spectrum. Which statement explains the greedy hamburgular theory which explains why this happens?
According to the video Why Aren’t Plant Black, we know that most plants do not absorb green on the light spectrum. Which statement explains the purple theory that has nothing to do with the hamburgers theory which explains why this happens?
_______________ are pigments that are not always highly efficient in transferring light (they prefer to absorb only blue wavelengths) and are also found in all three domains of life (usually as antioxidants in animals). Fill in the blank.
Carotenoids
Photosystems are composed of two closely linked components. Which statement accurately describes one of those components?
Antenna complex - has hundreds of molecules (like chlorophyll) that gather the energy that it is going to need, then sends it to the reaction center
Reaction center - where all of the information and energy gets passed out, allowing for all of the processes to be able to happen
Which statement does not describe a difference discussed in class between cyclic and noncyclic phosphorylation?
Cyclic - is only going to use 1 photosystem only; does not produce any oxygen in any steps
Noncyclic - it will produce oxygen and ATP; you have to use 2 photosystems
What is a similarity discussed in class between cyclic and noncyclic phosphorylation?
Oxygen and ATP with still be produced along with a photon gradient
Why does using two photosystems instead of one create an enhancement effect?
Because you can obtain more energy by using more photosystems
