The spontaneous loss of amino groups from adenine in DNA results in hypoxanthine, an uncommon base, opposite thymine. What combination of proteins could repair such damage?

TLS Online TPP Program

#Question id: 11342

#Unit 2. Cellular Organization

What happens to K⁺ transport by valinomycin when the membrane is cooled below its transition temperature?

TLS Online TPP Program

#Question id: 11343

#Unit 2. Cellular Organization

In the liver, which type of GLUT transports glucose out of hepatocytes when liver glycogen is broken down to replenish blood glucose?

TLS Online TPP Program

#Question id: 11427

#Unit 2. Cellular Organization

Which of the following transporters cause antibiotic resistance in pathogenic microbes such as Pseudomonas aeruginosa, Staphylococcus aureus, Candida albicans, Neisseria gonorrhoeae, and Plasmodium falciparum?

TLS Online TPP Program

#Question id: 11428

#Unit 2. Cellular Organization

Each monomer of aquaporin1 has six transmembrane helical segments and two shorter helices, both of which contain the sequence:

TLS Online TPP Program

#Question id: 11429

#Unit 2. Cellular Organization

If the ATP supply in the cell shown in the figure below suddenly vanished, would the intracellular glucose concentration increase, decrease, or remain the same?

TLS Online TPP Program

#Question id: 11430

#Unit 2. Cellular Organization

For GLUT1 in the human erythrocyte membrane, the Km for glucose transport is 1.5 mM. Thus when the extracellular glucose concentration is 1.5 mM, roughly half the GLUT1 transporters with outward-facing binding sites will have a bound glucose, and transport will occur: