Let’s compare the proteins of Chlamydomonas with those of humans and the plant Arabidopsis. Which of the following is a protein that you find in all three species? A. ODA16, pro

Let’s compare the proteins of Chlamydomonas with those of humans and the plant Arabidopsis.
Which of the following is a protein that you find in all three species?
A. ODA16, protein required for eukaryotic flagella assembly.
B. Protochloriphylide reductase, and enzyme of the chlorophyll biosynthetic pathway.
C. uS2, a protein required for DNA replication.
D. Gas4, a protein required for assembly of cell walls.

Question 4 of 51 Points
Cells of Chlamydomonas appear green under a light microscope because green photons are reflected by chlorophyll or pass right through it.
What is the biophysical reason why chlorophyll cannot absorb green light?
A. Green photons are too unstable to be absorbed by chlorophyll
B. Chlorophyll lacks an excited state that matches the energy of a green photon.
C. Green photons of light contain too much energy; absorption would result in the oxidation of chlorophyll.
D .Chlorophyll does absorb green light; the excited state just decays very rapidly with the energy being lost as heat.

Question 5 of 51 Points
Recall our comparison of a photosystem and a photoreceptor.
Which of the following is one way in which a photosystem is different from a photoreceptor?
A. It is only in a photosystem where a pigment molecule is specifically bound to a protein.
B. It is only in a photosystem where light absorption triggers a change in shape of a protein.
C. It is only in a photosystem where light absorption excites an electron.
D. It is only in a photosystem where light absorption triggers the oxidation of a pigment.