Question
If phospholipid synthesis in the ER is blocked, what cellular function is most directly impaired?
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Answer
Membrane biosynthesis and trafficking; fewer membranes and vesicles can form.
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Question
A protein sequence contains a 22-amino-acid stretch dominated by leucine, isoleucine, valine, and phenylalanine. Where is this region likely located?
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Answer
A transmembrane domain; a long hydrophobic segment can span the bilayer as an alpha helix.
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Question
If a cell has linear chromosomes in a nucleus, mitochondria, and a mitotic spindle, how should you classify it?
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Answer
Eukaryotic; all three are hallmark eukaryotic features.
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Question
Fluid mosaic model
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Answer
Mobile lipids and proteins in a bilayer; clue: lateral movement and fluidity.
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