Which type of membrane protein might be dissociated from the membrane by changing the pH or the ionic strength?

If the concentration of a solute is the same both inside and outside the cell, what might you expect with regard to its transport by a membrane protein?

Which of the following best explains how substances are transported across the cell membrane?

Nucleic acids absorb light strongly in the ultraviolet region of the spectrum because they have ________ double-bond systems.  

Ceramides contain a fatty acid linked by an____________ via the C-3 hydroxyl group of sphingosine.

As DNA denatures, its UV absorbance at 260nm increases due to the “hyperchromic effect.” All of the following statements about DNA denaturation are true, EXCEPT:

Which of the following does NOT describe the secondary structure of DNA as proposed by Watson and Crick?

Mitochondrial complex I is a large protein complex located in the inner mitochondrial membrane. During cellular respiration, this complex uses energy to transport hydrogen ions (H+) against their concentration gradient. The steps of (H+) transport carried out by mitochondrial complex I are depicted in the following diagram:     Given the concentration gradient established by mitochondrial complex I, which of the following movements can occur?

Membrane passive transport and transport by channels and pores requires ________.  

Purines and pyrimidines exist in two tautomeric forms (lactam and lactim); nucleosides exist in two conformations (syn and anti). The most common forms found in cells are ________.