A molecule is found to be able to diffuse across a membrane. Which of the following characteristics would best describe this molecule? Question options: hydrophobic negatively charged polar neutral hydrophilic
Almost all biological membranes are phospholipid bilayers, so if the membrane stated here is same then the most important property driving the diffusion of a molecule is the hydrophobicity, then neutral molecule diffuse better and finally the small molecules can pass easily.
So, here i will tell you why hydrophobic molecules move better. the membrane is made up of phospholipid bilayer i.e. 2 layers of phospholipid which have 2 components a glycerol head and 2 fatty acid chains. The head is hydrophilic and tail are hydrophobic so the interior of the layer is hydrophobic. So, when a hydrophobic molecule come near the membrane the outer hydrophilic region push it into the midde and then it goes to interior.
Then comes the charge neutral molecules will not interact with the amino acids inside the bilayer so can move easily.
Diagram of the bilayer is given below.
A molecule is found to be able to diffuse across a membrane. Which of the following...
A molecule takes 3.0 seconds to diffuse across a membrane. If the thickness of the membrane is doubled, then how long does it take the molecule to diffuse across the thicker membrane?
12. Rank the following molecules in their ability to freely diffuse across the membrane (from 1- likely to 4- very unlikely) Large uncharged polar molecules, hydrophobic molecules, small uncharged polar molecules, ion.
Question 1 (1 point) Of the following, which type of molecule moves directly across a membrane at the slowest rate? Large polar molecules, such as glucose Proteins and other macromolecules Small, uncharged polar molecules, such as water lons, such as chloride (CI)
Question 11 (1 point) of the following, which type of molecule moves directly across a membrane most easily? Large polar molecules, such as glucose Small, uncharged non-polar molecules such as 02. lons, such as chloride (CI) Proteins and other macromolecules
A DNA molecule has many phosphate groups, as shown below What type of amino acid side chains would be most likely be involved in binding this substrate at the active site? Select one polar, negatively charged polar, positively charged hydrophobic polar neutral
Lo 8: Properties of the Plasma Membrane 1) Draw the structure of a phospholipid and label the three parts: Glycerol backbone, fatty acid tails and phosphate head group. Label which regions are hydrophobic and which are hydrophilic. Be able to explain WHY they have the property they do (think of their chemical make up-look it up if you need a reminder). 2) Describe two properties that affect membrane fluidity? Draw a representation of how each property affects membrane fluidity. Explain...
Question 1 Which of the following are likely to diffuse through the plasma membrane? glucose K+ Cl- H20 Na+ CO2 02 lipid Question 4 Which is(are) true about transport across the membrane? Channels can perform either active or passive transport Charged molecules move according to their electrochemical gradients Movement of an ion down its gradient requires energy Transporters are faster but less selective than channels Question 6 In the coupled transport of Na+ and glucose, the transporter O is an...
Membrane Permeability a. What molecule makes up the majority of the cell membrane and how does its structure create the semi-permeable nature of the membrane? b. For each of the following molecules describe whether or not it can freely diffuse across a cell membrane. Justify your answers. RNA, Cholesterol, Carbon Dioxide (CO2), Sodium ions (Na+), please be as detail as possible.
Which of the following statements on membrane transport is NOT correct: A. To transport of solutes in the unfavorable direction across the membrane, pumps couple the process with either ATP hydrolysis, light absorption, electron transport, orother favorable transport process. B. Dissolved gases like O2, CO2, or NO simply diffuse across a membrane bilayer C. Hydrophilic molecules require assistance by membrane proteins to cross the membrane bilayer. D. The rate of transport facilitated by transporters is faster, but less selective for...
Lo 10: Electrochemical Gradient The difference in voltage across the membrane is called the __________________________________. The inside of a normal cell is ___________________ (+/-); while the outside is ___________(+/-). The resting membrane potential of a neuron is ___________mV. Diagram the relative ratios of Ca++, Na+ and K+ in a cell under resting conditions. Draw an arrow for each of the molecules indicating which direction would be passive transport (into or out of the cell). For each of the following sentences, fill in...