Plastoquinone (PQ), an electron carrier of small molecular weight, is found in the electron transport chain associated with photosystem II. If PQ is not directly anchored to other membrane or cytoplasmic structures, it is probably _____
A) mobile in the thylakoid membrane
B) lipid soluble
C) a molecule that serves as a shuttle between the electron transport chain and ATP synthase
D) both lipid soluble and a molecule that serves as a shuttle between the electron transport chain and ATP synthase
Answer: D
You might also like to view...
Examine this diagram. Note the structure of branches connecting groups of organisms. Called a phylogenetic tree, the branches propose relationships among organisms to each other, related to common ancestors. Although the proposed relationships can be described in sentences, the diagram summarizes them visually. Which of the following statements is true based on this diagram?
A. All the organisms in this phylogenetic tree are equally related to one another.
B. The organisms in domain Archaea are more closely related to the organisms in domain Eukarya than those in domain Bacteria.
C. The organisms in kingdom Protista are part of domain Bacteria.
D. All of the answer choices are correct.
E. The organisms in domain Bacteria are more closely related to the organisms in domain Eukarya than those in domain Archaea.
A type of horizontal gene transfer in prokaryotes, in which a cell receives DNA from another cell through a sex pilus, is
A. replication. B. fixation. C. transduction. D. transformation. E. conjugation.
Which of the following statements is true about the serotonin receptor family?
a. Most of the receptors are ionotropic b. 5-HT1A receptors are located primarily in the cerebral cortex c. 5-HT2A receptors cause inhibition by decreasing adenyl cyclase and increasing potassium efflux d. The newer antipsychotics like Risperdal act by blocking the 5-HT2A receptor e. LSD and similar hallucinogens are most likely agonists at the 5-HT1A receptor
During transcription, the synthesis of the mRNA strand proceeds in which direction?
A) 5' to 3' only B) 3' to 5' only C) Both 5' to 3' and 3' to 5' D) Either 5' to 3' or 3' to 5' E) First 5' to 3', and then 3' to 5'