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BIO 181- Module ¾- Questions & Answers
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BIO 181- Module ¾- Questions & Answers
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BIO 181- Module ¾- Questions &Answers
When a vesicle fuses with the plasma membrane the contents of the lumen of the vesticle
are: Correct Ans-ligands that are used in cell communication
Explain how the vesicles are carried from the Golgi apparatus to the plasma
membrane. Correct Ans-The Golgi apparatus makes a vesicle for proteins which travelson the
microtubule system then on the actin filament system to the plasma membrane. In short: golgi
apparatus makes vesicle, vesicle-> microtubule system-> actin filament-> plasma membrane
It is a simple matter (i.e., thermodynamically favorable) for a vesicle to form from the
endoplasmic reticulum. Correct Ans-FALSE (NOT thermodynamically favorable)
Facilitated diffusion uses a channel protein to let components move down their concentration
gradient. Correct Ans-TRUE
, For a protein to enter the endoplasmic reticulum as part of the endoplasmic reticulum's lumen
or part of the endoplasmic reticulum's membrane: Correct Ans-a ribosome binds to the
mRNA and a short stretch of protein is synthesized that contains a signal sequence.
What is the difference between a single-pass transmembrane protein and a 7-pas
transmembrane protein? Correct Ans-A single-pass TMP crosses the membrane only once
and is not an open channel. a 7-pass TMP will cross the membrane seven times and will create
an open channel.
Explain the evolutionary origin of the endoplasmic reticulum, Golgi apparatus, and
vesicles. Correct Ans-They are all believed to have formed from the invagination of the
plasma membrane during the Endomembrane system theory.
What is the difference between a triglyceride and a phospholipid? Correct Ans-A
phospholipid has two fatty acids and a triglyceride has three fatty acids.
Amino acids can be largely subdivided into two groups. What are the two groups? Correct
Ans-hydrophilic (polar), hydrophobic (non-polar)
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