15. This type of epithelia has cells that produce a substance and release it, ei
ID: 147473 • Letter: 1
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15. This type of epithelia has cells that produce a substance and release it, either onto a surface or into the blood a exchange b. transport c. ciliated d. protective e secretory 16. What will occur if solution A (500ml solution containing 400mosmol/ nonpenetrating solute) is separated by a biological membrane from solution 8 (4L solution containing 600mosmel/L norpenetrating solute)? a The volume of solution A will increase. b The volume of solution B will increase. c. There will be no net volume change. d. The norpenetrating solute will move from solution B to solution A 17, Compared to the outside surface, the inside of a resting cell membrane is a. positively charged b. negatively charged. c. electrically neutral d. continuously reversing its electrical charge. 18. Facilitated diffusion and active transport differ in that a. facilitated diffusion uses cell membrane proteins to move sub stances, whereas active transport does not facilitated diffusion uses a substrate to bind to a protein carrier, whereas active transport does not b. c. ATP is necessary for active transport, but not for facilitated diffusion d. potential energy is required for active transport but not for facilitated diffusion. 19. The tonicity of a solution only depends on a. total concentration of all solutes b. concentration of nonpenetrating solutes e concentration of penetrating solutes d. concentration of all ions. 20. are molecules that bind to the receptor in such a way that they block the normal ligand from binding and turning the receptor on. As a result, the signal pathway remains inactive. a Primary ligands b. Paracrines c. Neuromodulators d. Antagonists e. AgonistsExplanation / Answer
15. The answer is- e. Secretory
Secretory cells produce and release substances.
Exchange cell result in exchange and ciliated cells result in movement.
Protective cells don't allow someone to get inside the cell.
Transport cells performs the role of transportation.
16. The answer is- b. The volume of solution B will increase.
Concentration of solution B is greater than solution A. And if they are separated by biological membrane movement of solvent will take place from lower concentration to higher concentration.
17. The answer is- b. Negatively charged
Resting membrane potential of a cell is always inside negative -70mV and outside positive.
18. The answer is- c.ATP is necessary for active transport but not for facilitated diffusion.
Both active transport and facilitated diffusion uses membrane proteins.
The major difference is that active transport requires energy in form of ATP to move substances against the gradient.
But facilitated diffusion dose not require ATP. As it moves substances along the gradient.
19. The answer is- b. Concentration of non penetrating solutes.
Tonicity is dependent upon concentration of solutes separated by membrane.
20. The answer is- d. Antagonist.
An antagonist binds with receptor and makes it inactive. It blocks the receptor from binding with agonist. Agonist binding makes receptor functional.
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