The electron transfer chain is located ____.
A. on the inner membrane of the mitochondria
B. on the inner membrane of the chloroplasts
C. in the fluid part of the chloroplast
D. throughout the cytoplasm of the cell
E. on the plasma membrane of eukaryotes
Answer: A
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A Giemsa stain is performed on an eye exudate on a patient with calabar swelling, eosinophilia, and a recent travel history to Africa. L. loa is suspected; however, the sheath in the adult worm recovered does not stain. Which one of the following statements explains this discrepancy?
a. The worm recovered is not L. loa. b. The specimen should have been stained with trichrome stain. c. The Giemsa stain is most likely expired. d. No discrepancy is present. The sheath does not stain with Giemsa stain.
Fossils and molecular techniques reveal that the closest ancient wolflike relatives of most modern dogs lived in ____
a. Asia b. Africa c. South America d. North America e. Europe
Which of the following transporters does not use passive transport to move molecules across a membrane?
a. GLUT-1 glucose transporter b. Gramicidin ion channel c. Sodium-potassium pump d. Valinomycin
In the absence of glucose, how does the lac operon function when lactose is present?
A) Lactose binds to the repressor protein and alters its shape so it can no longer bind to the operator. RNA polymerase is then able to bind to the promoter and transcribes genes necessary for metabolizing lactose. B) Lactose binds to the operator, preventing the repressor protein from binding to the promoter. RNA polymerase is then able to bind to the promoter and transcribes the genes necessary for metabolizing lactose. C) A repressor protein binds to the operator, which prevents RNA polymerase from binding to the promoter. D) A repressor protein binds to the operator, preventing lactose from binding to the operator. RNA polymerase then binds to the lactose and breaks it down. E) Lactose binds to a repressor protein. The repressor protein then binds to RNA polymerase, which metabolizes the lactose and dismantles the repressor protein.