How might a steroid molecule be oriented in a phospholipid bilayer?
How might a steroid molecule be oriented in a
phospholipid bilayer?
Homework Answers
Phospholipid bilayer of the plasma membrane of a cell is amphipathic in nature. It is because it has both hydrophilic and hydrophobic properties.
As per the hydrophilic property is concerned, it is due to the presence of phosphate group. These phosphate groups are oriented towards the Aqueous side of the lipid bilayer therefore are present towards the extracellular side and towards the intracellular side of the bilayer.
As per the hydrophobic property is concerned, it is due to the presence of fatty acid tales. These fatty acid tails are water repellent. They are oriented in such a way so that they do not interact with water. Therefore they are present towards the inside and make the hydrophobic core of the membrane.
Steroid molecule is hydrophobic in nature and cannot interact with water. Therefore it will be embedded in the fatty acid core of the lipid bilayer.
See figure below -
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1. What is NOT TRUE regarding a phospholipid bilayer? A. The two leaflets of the bilayer...
1. What is NOT TRUE regarding a phospholipid bilayer? A. The two leaflets of the bilayer are identical. B. It takes energy to flip one phospholipid from one side to the other C. In animal cells cholesterol is inserted into the bilayer D. The bilayer can contain more than one type of phospholipid. 2. New membrane is made and assembled in the ___ and delivered to the plasma membrane in vesicles derived from the _. A. Cytosol; ER B. Cytosol;...
Which of the following molecules may diffuse freely through a phospholipid bilayer? please select two answers-...
Which of the following molecules may diffuse freely through a phospholipid bilayer? please select two answers- -asparagine, an amino acid with a large, hydrophilic side chain -alanine, an amino acid with a small, hydrophobic side-chain -testosterone, a steroid hormone -fructose, a monosaccharide molecular oxygen (O2)
Why is the phospholipid bilayer referred to as a 2 dimensional fluid?
Why is the phospholipid bilayer referred to as a 2 dimensional fluid?
» Predict the relative rates of movements of particular solutes through a phospholipid bilayer.
» Predict the relative rates of movements of particular solutes through a phospholipid bilayer.
Shown is a phospholipid bilayer with Na+ on each side. What direction will the Na+ move?...
Shown is a phospholipid bilayer with Na+ on each side. What
direction will the Na+ move?
A. A to B
B. B to A
C. Both directions
D. It can't move across the bilayer
What functions of a membrane would be compromised if the membrane consisted of a phospholipid bilayer...
What functions of a membrane would be compromised if the membrane consisted of a phospholipid bilayer without proteins? Give at least 3 specific examples.
Cell membranes contain channels that allow ions to cross the phospholipid bilayer. A particular K+ channel...
Cell membranes contain channels that allow ions to cross the phospholipid bilayer. A particular K+ channel carries a current of 1.77 pA . How many K+ ions, ? , pass through the channel in 1.72 ms ?
what were the key changes in the structure of the phospholipid bilayer change that were necessary...
what were the key changes in the structure of the phospholipid bilayer change that were necessary for life to appear and why are these concepts important in the eventual evolution of life on earth ?
30. Which cellular component below is surrounded by a single phospholipid bilayer? A) one cisternae of...
30. Which cellular component below is surrounded by a single phospholipid bilayer? A) one cisternae of the golgi body B) mitochondria C) nucleus D) chloroplast E) A and D
Double layer (bilayer) of phospholipid molecules Transmembrane Phospholipid bilayer protein Integral proteins Peripheral proteins Cytoplasmic side...
Double layer (bilayer) of phospholipid molecules Transmembrane Phospholipid bilayer protein Integral proteins Peripheral proteins Cytoplasmic side of membrane Cholesterol molecules Hydrophobic fatty acid "tail" Hydrophilic phosphate "head Figure 3-2 Structures of the Cell Membrane Questions 4. Match the cellular components in column A with the descriptions in column B. Place the letter of your choice in the space provided. Column A a. Chromatin b. Cytoplasm c. Endoplasmic reticulum d. Golgi apparatus e. Lysosome f. Microtubule g. Mitochondrion h. Nuclear envelope...
» Predict the relative rates of movements of particular solutes through a phospholipid bilayer.
Shown is a phospholipid bilayer with Na+ on each side. What
direction will the Na+ move?
A. A to B
B. B to A
C. Both directions
D. It can't move across the bilayer
Double layer (bilayer) of phospholipid molecules Transmembrane Phospholipid bilayer protein Integral proteins Peripheral proteins Cytoplasmic side of membrane Cholesterol molecules Hydrophobic fatty acid "tail" Hydrophilic phosphate "head Figure 3-2 Structures of the Cell Membrane Questions 4. Match the cellular components in column A with the descriptions in column B. Place the letter of your choice in the space provided. Column A a. Chromatin b. Cytoplasm c. Endoplasmic reticulum d. Golgi apparatus e. Lysosome f. Microtubule g. Mitochondrion h. Nuclear envelope...
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