Biology Biology Practice Problems Solutions Library

Biological Membranes Solutions Library

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36 solutions

Biological Membranes

Q. What property of the phospholipid bilayer allows proteins to move laterally in the membrane?A. phospholipids and proteins are attracted to each oth...

Solved • May 6, 2020

Biological Membranes

Q. The primary structural components of the cell membrane are A) phospholipids and proteins. B) glycoprotein's and cholesterol. C) cholesterol and pro...

Solved • Apr 21, 2020

Biological Membranes

Q. A primary function of cholesterol in the plasma membranes of some animals is toA) facilitate the removal of hydrogen atoms from saturated phospholi...

Solved • Apr 21, 2020

Biological Membranes

Q. The fluid mosaic model of the membrane proposed that membranes A) consist of a single layer of phospholipids and proteins. B) consist of a phosphol...

Solved • Apr 21, 2020

Biological Membranes

Q. List 2 reasons why it is crucial that the cell membrane exhibit fluidity rather than be rigid.

Solved • Aug 6, 2018

Biological Membranes

Q. Why can cell membranes be polar?

Solved • Aug 3, 2018

Biological Membranes

Q. Which of these is a general feature of the lipid bilayer in all biological membranes?A. Na+ and K+ ions readily diffuse across the bilayer.B. Indiv...

Solved • Aug 1, 2018

Biological Membranes

Q. Which of the following lipids would not be found in cell membranes?A. cholesterolB. free fatty acidsC. phospholipidsD. All of the above are compone...

Solved • Jul 31, 2018

Biological Membranes

Q. Yeast strain X has ergosterol in its membranes, while yeast strain Z does not incorporate ergosterol into its membranes. These two yeast strains gr...

Solved • Jul 25, 2018

Biological Membranes

Q. Describe the structure characteristics of water and phospholipids. Include how these characteristics result in bilipid membrance formation. Mention...

Solved • Jul 11, 2018

Biological Membranes

Q. When phospholipids are added to water, they spontaneously form cell memranes. Explain this observation.

Solved • Jul 6, 2018

Biological Membranes

Q. Which of the following statements regarding the fatty acid tails of phospholipids is FALSE?a) Phospholipids with unsaturated tails make the bilayer...

Solved • Jul 5, 2018

Biological Membranes

Q. What are biological membranes composed of?

Solved • Jun 13, 2018

Biological Membranes

Q. Why are membranes referred to as Fluid Mosaics? What does this mean at a molecular level?

Solved • Jun 13, 2018

Biological Membranes

Q. Membrane proteins move laterally in a phospholipid bilayer but generally not up and down. Why would this be so?

Solved • Jun 8, 2018

Biological Membranes

Q. Which of the following statements are true? Select all correct answers. a. A plant that produces more monounsaturated fatty acids than polyunsatura...

Solved • Jun 8, 2018

Biological Membranes

Q. The membrane of an animal cell nucleus contains phosphatidylcholine in which a significant number of the fatty acid residues are saturated. After r...

Solved • May 24, 2018

Biological Membranes

Q. Explain how organisms are able to maintain a relatively constant membrane fluidity when faced with extremes in temperatures.

Solved • May 23, 2018

Biological Membranes

Q. It is said that ribonucleotides can diffuse through some types of liposomes. It is likely that the lipids present early in chemical evolution had s...

Solved • Nov 15, 2017

Biological Membranes

Q. Explain why the flexibility (fluidity) of a membrane increases when more of the hydrocarbon tails in the phospholipids layers contain double bonds.

Solved • Oct 24, 2017

Biological Membranes

Q. Part of a phospholipid is nonpolar.a. Draw a square around the portion of the molecule that is nonpolar.b. Would this portion of the phospholipid i...

Solved • Oct 24, 2017

Biological Membranes

Q. The molecule cholesterol plays an important role in a. keeping membranes liquid at low temperature. b. keeping membranes solid at high temperatur...

Solved • Aug 4, 2017

Biological Membranes

Q. Which of the following describes an example of self-assembly in cells? a. formation of a phospholipid bilayer through hydrophobic interactions. b...

Solved • Aug 4, 2017

Biological Membranes

Q. When phospholipids are mixed with water their ____ interact with water and their ____ are repelled, forming a lipid bilayer. a. Hydrophobic heads, ...

Solved • Aug 2, 2017

Biological Membranes

Q. A cell membrane is not: a. A fluid structureb. A rigid structurec. A mosaic structured. A bilayered structuree. Composed of phospholipid molecules

Solved • Aug 2, 2017

Biological Membranes

Q. A phospholipid molecule:  a. Has a hydrophilic head that is repelled by water b. Has hydrophilic tails that are repelled by water c. Has a hydro...

Solved • Aug 2, 2017

Biological Membranes

Q. The primary structural component of a cell membrane is:  a. A cholesterol molecule b. A protein molecule c. A phospholipid molecule d. An enzym...

Solved • Aug 2, 2017

Biological Membranes

Q. Biological membranes contain bilayers of which of the following lipids? a. phospholipids b. oils c. triglycerides d. sex hormones

Solved • Jul 19, 2017

Biological Membranes

Q. The Fluid Mosaic Model proposed by Singer and Nicolson in 1972 included thata. The cell membrane was composed of lipids and proteins.b. The cell me...

Solved • Jul 18, 2017

Biological Membranes

Q. Cholesterol functions in the plasma membrane toa. transport ionsb. serve as an energy moleculec. regulate membrane fluidityd. mediate steroid action 

Solved • Jul 18, 2017

Biological Membranes

Q. The following are all functions of a typical plasma membrane excepta. transport of water and bulk materialb. selective transport of certain molecul...

Solved • Jul 18, 2017

Biological Membranes

Q. The fluid nature of the membranes is attributed to a lateral movement ofa. protein channelsb. phospholipid moleculesc. antigen moleculesd. pumps su...

Solved • Jul 18, 2017

Biological Membranes

Q. Which of the following properties is not true of membrane phospholipids?a.  The hydrophobic tails are oriented towards the interior.b.  The hydroph...

Solved • Jul 18, 2017

Biological Membranes

Q. The plasma membrane is a thin sheet of lipid embedded with larger moleculesa. called proteinsb. called polymersc. called nucleotidesd. of sodium an...

Solved • Jul 18, 2017

Biological Membranes

Q. The proteins of the plasma membrane are in large part responsible for the cell's ability to interact with its environment. They act as or are invol...

Solved • Jul 18, 2017

Biological Membranes

Q. When phospholipid molecules are placed into water, microspheres form spontaneously. These microspheres are called: a. protons b. archaebacteria ...

Solved • Jul 18, 2017