Microbiology Chapter 4 Exam Questions with 100% Correct Answers | Verified | Updated

Microbiology Chapter 4 Exam Questions with 100% Correct Answers | Verified | Updated Which of the active transport types employs diffusion? - answerSymport What type of transport uses two transport proteins? - answerSymport Sodium and potassium ions need to be pumped simultaneously against their concentration gradients. Which one of the transport proteins would be most effective at this? - answerAntiport Why are ATPases associated with active transport proteins? - answerThey provide transport proteins with the energy needed to pump molecules against their concentration gradients. Efflux pumps can be used to pump antibiotics out of a cell once they enter to protect the cell. This will be done against the concentration gradient of the antibiotic. Which of the active transports would most likely be used? - answerA Uniport would pump the antibiotic out without needing to bring additional molecules into the cell, and would not allow the antibiotic to diffuse back in. Which of the following molecules would be blocked by a cell membrane? - answerIons Hydrophobic molecules would enter a cell - answerthrough integral transport proteins. What is a hallmark of passive transport across cell membranes? - answerIt occurs along an electrochemical gradient, and may involve the use of transport proteins. A positively charged sodium ion - answerwould require the use of integral protein channels to pass through a cell membrane. Which of the following statements regarding active transport is false? - answerIt powers the diffusion of water across the cell membrane. What makes phospholipid membranes good at keeping some molecules out, and allowing others to freely pass? - answerThey have both hydrophilic and hydrophobic regions. Integral proteins are mostly involved in - answertransport function. How does water enter and exit a cell? - answerBy simple diffusion or by use of an integral transport protein