1. Which properties are characteristic of ion channels? a. They are usually lipids. b. They exist on one side of the plasma membrane, usually the intracellular side. c. They can open and close depending on the presence of any of three types of "gates." d. They permit movement of ions against concentration gradients. e. They mediate facilitated diffusion. 2. Which of the following does not directly or indirectly require an energy source? a. primary active transport b. operation of the sodium/potassium pump c. the mechanism used by cells to produce a calcium ion gradient across the plasma membrane d. facilitated transport of glucose across a plasma membrane e. secondary active transport 3. If a small amount of urea were added to an işoosmotic saline solution containing cells, what would be the result? a. The cells would shrink and remain that way. b. The cells would first shrink, but then be restored to normal volume after a brief period of time. c. The cells would swell and remain that way. d. The cells would first swell, but then be restored to normal volume after a brief period of time. e. The urea would have no effect, even transiently. 4. Which is (are) true of epithelial cells? a. They can only move uncharged molecules across their surfaces. b. They may have segregated functions on luminal and basolateral surfaces. c. They cannot form tight junctions. d. They depend upon the activity of Na+/K+-ATPase pumps for much of their transport functions. e. Both b and d are correct. 5. Which is incorrect? a. Diffusion of a solute through a membrane is considerably quicker than diffusion of the same solute through a water layer of equal thickness. b. A single ion, such as K+, can diffuse through more than one type of channel. c. Lipid-soluble solutes diffuse more readily through the phospholipid bilayer of a plasma membrane than do water-soluble ones. d. The rate of facilitated diffusion of a solute is limited by the number of transporters in the membrane at any given time. e. A common example of co-transport is that of an ion and an organic molecule,

A: PCR means polymerase change reaction in which the main enzyme DNA polymerase amplifies a given DNA…

A: The genotype in case of normal vision  will be symbolized by (XX), and colour blindness by (XX). X…

A: The widely used and closely related Escherichia coli "wild types" W3110 and MG1655, as well as…

A:

A: Sponges are multicellular organisms that are studied under spongiology. They are heterotrophic…

A: The objective of the question is to understand the importance of tablet compression in the…

A: A disease is a condition in which the body cells do not function properly. The biochemical reactions…

A: 5'UTR stands for untranslated region at the 5' end of the DNA sequence. 3' UTR stands for…

A: Introduction  Zoology is a branch of biology that focuses on the study of animals, including their…

A: Ostomy causes a change in the way urine or stool exits the body as a result of a surgical procedure.…

A: In the medical field, accurate coding is essential for billing and reimbursement purposes. Proper…

A: In a given condition patient is suffering from bilateral pain so the doctor prescribed her NSAIDs.…

A: PACU is an abbreviation for Post Anesthetic Care unit. PACU is a specific unit in the hospital,…

A: The biological process in which the offspring (new individuals) are produced from their parents is…

A: Drosophila has been widely used in genetic studies as it produces a large number of offspring and…

A: All these structures given are protein domain or motif structure and is part of many large protein…

A: The alleles are generally of dominant and recessive type and some other forms like codominant are…

A: DNA or deoxyribonucleic acid is the genetic material in living organisms which is made up of…

A: Gel electrophoresis is a laboratory method used for the separation of charged molecules from a…

A: The representation of all the chromosomes of the cell nucleus of males or females is representation…

A: Nursing counselling and advise involves certain intervention which helps process focusing on the…

A:

A: The study of bacterial cultures is an interesting aspect of microbiology. It includes the cautious…

A: Xylem transport is the process by which water and dissolved minerals are transported from the roots…