You perform an experiment similar to the Frye and Eddidin heterokaryon experiment except that you mix two cells from two unknown organisms. The mixing of proteins between the two cells takes 20 minutes instead of 1 hour. You conclude:

Question

You perform an experiment similar to the Frye and Eddidin heterokaryon experiment except that you mix two cells from two unknown organisms. The mixing of proteins between the two cells takes 20 minutes instead of 1 hour.  You conclude:

BlackTom AI · Accepted Answer

The scenario describes mixing two cells from unknown organisms and observing that protein exchange between the cells occurs in 20 minutes rather than 1 hour, which implies increased membrane fluidity compared to the original setup. Now evaluate each option in light of membrane fluidity and its impact on intercellular exchange:
Option 1: 'There are more carbohydrates on the surface of the lipid bilayer' While surface carbohydrates can affect cell recognition and adhesion, they do not directly explain a faster cytoplasmic protein exchange between fused membranes. The rate-linding factor here is membrane fluidity, not surface glycosylation.
Option 2: 'The lipid bilayers of these cells have more unsaturated hydrocarbons' This correctly points to increased membrane fluidity. Unsaturated hydrocarbon chains (with double bonds) introduce kinks that prevent tight packing of lipids, increasing fluidity and allowing faster mixing of membrane proteins and lipids between the two cells.
Option 3: 'The lipid bilayers of these cells have more saturated hydrocarbons' Saturated chains pack tightly, reducing membrane fluidity. That would tend to slow down exchange, not accelerate it, making this option inconsistent with the observed 20-minute exchange time.
Option 4: 'This experiment was done at a very cold temperature' Cold temperatures generally decrease membrane fluidity, slowing molecular movement and exchange. Unless extreme conditions were stated, a cold temperature would not explain faster exchange; it would likely slow it down rather than speed it up.
Putting the pieces together, the only explanation that aligns with faster intercellular protein exchange via membrane fusion dynamics is increased membrane fluidity due to unsaturated hydrocarbons. The other options fail to account for the observed acceleration or rely on factors that would impede exchange rather than enhance it.

You perform an experiment similar to the Frye and Eddidin heterokaryon experiment except that you mix two cells from two unknown organisms. The mixing of proteins between the two cells takes 20 minutes instead of 1 hour. You conclude:单项选择题

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