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Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Question

Virtually all animal cells have a Na*/K*
pump. Which of the following statements
concerning it is NOT correct?
a.
O b.
C.
O d.
It is an uniport.
It is an active transporter.
It transports Na* and K* by consuming ATP as
energy.
It is also called Na+/K* ATPase.

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Which of the following is an example of a primary active transport? a.CPT-I b.Na+/K+ pump c.proton pump d.O2 pump
Which of the following is incorrect about membrane transport systems? a. Glucose transport in red blood cells is a uniport system b. The Na+/K+ ATPase is an antiport system c. The H+/K+ ATPase is an active transport system d. The chloride-bicarbonate exchanger in erythrocytes is a uniport system
The gap junction channel formed by connexin 43 in cardiac muscle has which of the following properties? A. Is highly selective for sodium ions. B. Is opened and closed by a gate on the intracellular side of S4 C. Is non-selective for a wide variety of ions. D. Is opened and closed by positive charges on 54 E. None of the above
What of the following would cause a cell to shrink? A. Increased activity of the sodium-potassium pump B. Increased heart rate OC. Increased water absorption by the kidneys OD. Increased Intracellular osmolarity S BURDEN
What is the role of cholesterol in animal cell membranes? A. Blocks the association of the fatty acyl chains of phospholipids at high temperature. B. Is a receptor site for hormones on the surface of membranes. C. Broadens the temperature range of optimum membrane fluidity. D. Aids in the transport of small hydrophobic molecules across the membrane. A fatty acid designated as 20:0 is ________, while one that is designated 20:3 delta ^5,8,11 is ________. A. complex; simple B. unsaturated; saturated C. saturated; unsaturated D. simple; complex E. monounsaturated; polyunsaturated
Part 1: If a gated channel (not a pump) is specific for potassium ions and based on what you know about concentration gradients, when will the potassium ions move through the channel? a) Is gated channel transport using energy (ATP)? Part 2: Why does the sodium - potassium pump need to use energy (ATP)? a) Define active transport in your own words.
GABA receptors play an essential role in neurotransmission in the central nervous system. In response to the appropriate signal, these receptors open up and allow CI (chloride ions) to flow into the cell. Given this information, GABA receptors can be classified as a A. gated ion channel B. carrier protein O C. symporter D. enzyme
Consider a hypothetical cell where the import of glucose is powered through the coupled export of sodium ions. Which of the following are true? This is known as symport. This process does not require energy. Glucose is moving down its electrochemical gradient. Sodium is moving down its electrochemical gradient.
Emodin (a laxative) is used to treat constipation. This drug inhibits Aquaporin 3 located in the cells lining the colon. a. What can you infer regarding the function of Aquaporin 3? b. How will the drug treat constipation? Answer the questions as stated above. Use the information as guide
-In the figure to the left, what type of transport is being used to move sodium out of the cell? a. Simple diffusion b. Passive transport c. Primary active transport d. Secondary active transport Na Na Na Na Na Na Na Na Na Na 3 Na Na Na Na Glucose Na Na Na Na Na glucose symporter Na Na-K" ATPase Na Glucose Glucose Na ATP + H,0 2K ADP + P Glucose
At the Vmax of a transporter: O Passive diffusion mechanisms become activated. O The direction of transport reverses. O Half of the transporter molecules are saturated with cargo. O Additional energy is required to further increase the speed of cargo movement. O None of these options describe Vmax of a transporter.
Choose the processes from the list below which require active transport A. Water moving through the membrane B. Sodium moving out of a cell C. Potassium moving into a cell D. Endocytosis E. Oxygen moving from inhaled air into blood stream.

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