How do small fat-soluble molecules normally get into a cell? a. they never get in b. the pass through specialized proteins in the cell membrane called aquaporins c. they bind to protein carriers d. they pass through membrane protein channels e. They dissolve in the hydrophobic components of the membrane and enter the cell by diffusion

How do small fat-soluble molecules normally get into a cell? a. they never get in b. the pass through specialized proteins in the cell membrane called aquaporins c. they bind to protein carriers d. they pass through membrane protein channels e. They dissolve in the hydrophobic components of the membrane and enter the cell by diffusion

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 14RQ: Active transport must function continuously because_______. a. plasma membranes wear out b. cells...

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Which of the following methods of transport is being used to transfer the substance into the cell in the accompanying graph? a. diffusion down a concentration gradient b. osmosis c. facilitated diffusion d. active transport e. vesicular transport f. It is impossible to tell with the information provided.
Glucose is transported across the cell membrane of intestinal cells. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells? A facilitated diffusion B simple diffusion C osmosis D concentration gradient
which of the following statements is correct about the movement of water across a plasma membrane a. it cannot pass through any ion channels b. it moves through the membrane via mediated transport c. even though it a polar molecule, it moves readily through the nonpolar lipid bilayer d. artificial lipid membranes are impermeable to water
Glucose is often present in very low concentrations in environments populated by microorganisms. To import the maximum amount of available glucose, cells use a. Receptor-mediated endocytosis b. Simple diffusion c. Osmosis d. Facilitated diffusion
Indicate whether the following statements are true or false. If a statement is false, explain why it is false. a. All types of cells contain cell walls, but only some cell types possess plasma membranes. b. The distribution of specific lipids to the inner and outer leaflet is asymmetrical, or biased, in plasma membranes. C. Lateral diffusion is the movement of lipids from one layer of the membrane to the other. d. Fatty acids tails are used to embed integral, transmembrane proteins in the plasma membrane.
-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
Which of the following is NOT a function of membrane proteins? a.Regulate the passage of ions b.Act as carrier molecules for various solutes c.Act as anchors or stabilizers for the cell membrane d.Storage of cellular nutrients
Cholesterol can be packaged into droplets using LDL (low density lipoprotein). Cells that need to take in cholesterol from the LDL droplets have a protein on their membrane called an LDL receptor.This protein binds to the LDL droplet and brings the cholesterol into the cell by forming a vesicle around it.Which method of membrane transport is involved in this process? 1.Diffusion2.Endocytosis3.Exocytosis4.Osmosis
one reason active transport has a limited maximum transport rate at which it can progress is due to the fact that a. energy required is not available inside the cell b. carrier proteins are not on the surface of the cell membrane c. ion channels are limited in size d. the number of carrier proteins is limited and therefore they can become saturated
Active transport must function continuously because. a. plasma membranes wear out b. not all membranes are amphiphilic c. facilitated transport opposes active transport d. diffusion is constantly moving solutes in opposite directions
a. integral memebrane protein that crosses membrane multiple time b. lipid-linked membrane proteins c. peripheral memebrane protein d. integral memebrane protein that crosses membrane ince
The image illustrates passive and active transport across the cell membrane. (Use the diagram to answer questions A-C) A. 1. Which section shows active transport?2. Explain why or how can you tell?3. Does the cell expend energy in this transport?4. Why or why not? B. 1. Which section shows diffusion?2. What type of solute molecules may be moved by this type of transport? C. Which of these sections are considered passive transport? Explain.

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	a.	they never get in
	b.	the pass through specialized proteins in the cell membrane called aquaporins
	c.	they bind to protein carriers
	d.	they pass through membrane protein channels
	e.	They dissolve in the hydrophobic components of the membrane and enter the cell by diffusion