Active Transport – Transport Across Cell Membranes
Über den Vortrag
Der Vortrag „Active Transport – Transport Across Cell Membranes“ von Georgina Cornwall, PhD ist Bestandteil des Kurses „Cytoskeleton & Motor Proteins / Adhesion & Extracellular Matrix (Texas A&M FOM II 2020 Exam Unit 2)“.
Quiz zum Vortrag
The sodium-potassium pump is characterized by...? Select all that apply.
- … being an antiporter pump.
- ... the hydrolysis of an ATP molecule to transport Na+ ions out and the hydrolysis of one ATP molecule to transport K+ ions in.
- ... allowing both Na+ and K+ ions to move from a region of higher concentration to a lower concentration.
- ... having sodium-potassium ATPase as the transmembrane protein.
- ... transporting 3 Na+ ions outside the cell while transporting 2 K+ into the cell.
Which of the following is INCORRECTLY matched?
- Na+/glucose cotransporter – Primary active transport
- Symport membrane transport – Na+/glucose cotransporter
- Antiport – Na+/K+ pump
- Uniporter – moves a single substance in a single direction
- Active transport across membranes – Utilization of energy
Why do sports drinks contain both sodium and glucose?
- To facilitate the active transport of glucose across cell membranes via the Na+/glucose cotransporter
- To flavor energy drinks
- To facilitate the rapid breakdown of glucose
- To promote the rapid release of energy via the enzymatic breakdown of glucose
- To delay the leakage of K+ from the exterior to the interior of the cell
Which statement is NOT true about the Na+/glucose cotransporter?
- The Na+/glucose cotransporter is involved in primary active transport in the intestine for nutrient absorption.
- The Na+/glucose cotransporter is a symport membrane transport system.
- The Na+/glucose symporter utilizes energy derived from the Na⁺ concentration gradient.
- The Na+/glucose cotransporter is a secondary active transport system as it is dependent on the functioning of the Na+/K+ pump.
- The Na+/glucose cotransporter pumps glucose and Na+ from the external fluid into the cytoplasm.
Which statement is INCORRECT regarding the Na+/K+ pump?
- It is a secondary active-transport mechanism that transports 3 Na+ out of the cell for every 2 K+ pumped into the cell.
- It is a primary active transport mechanism that transports 3 Na+ out of the cell for every 2 K+ pumped into the cell.
- It creates both electrical and chemical gradients across the cell membrane.
- It can be used to drive secondary active transport, in which the generated gradient is used to transport another molecule against its concentration gradient.
- The conformational change to pump Na+ out of a cell requires energy from ATP.
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Dozent des Vortrages Active Transport – Transport Across Cell Membranes
Georgina Cornwall, PhD
Dr. Georgina Cornwall is a Biology Instructor and currently works as an Instructional Designer in the private sector, developing interactive online training materials.
She obtained her PhD in Environmental, Population, and Organismic Biology at the University of Colorado, USA, in 2000, and has since taught a broad array of biology courses at various US universities.
She is an active promoter of hybrid/online teaching formats and interactive courses, and has received several awards for her engaging and innovative course design; e.g., she was named Adjunct Faculty of the Year at Colorado Mountain College in Aspen twice.
Within Lecturio, Dr. Cornwall teaches courses on Biology & Genetics.
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