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101.

Glycolipids are synthesized in the ER and ____________(a) Nucleus(b) Golgi complex(c) Mitochondrion(d) Plasma membraneThis question was addressed to me by my college director while I was bunking the class.This intriguing question originated from Cytoplasmic Membrane Systems in chapter Cytoplasmic Membrane Systems of Cell Biology

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The correct answer is (b) Golgi complex

The BEST explanation: Most membrane LIPIDS are synthesized ENTIRELY in the endoplasmic reticulum with a few exceptions, one being GLYCOLIPIDS. The synthesis of glycolipids begins in the ER and completes in the Golgi complex.
Discussion
102.

In the image below, endoplasmic reticulum is depicted by ________(a) a(b) b(c) c(d) dThis question was posed to me in homework.Query is from Cytoplasmic Membrane Systems in portion Cytoplasmic Membrane Systems of Cell Biology

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The correct answer is (a) a

Easiest explanation: The endoplasmic reticulum is a membranous structure containing SACS called CISTERNAE. The organelle is ASSOCIATED with ribosomes and lies in close VICINITY with the nucleus.
Discussion
103.

Hydrophobic transmembrane segments of which proteins are not synthesized in the endoplasmic reticulum?(a) integral membrane proteins(b) lysosomal proteins(c) steroids(d) secretory proteinsThe question was posed to me in an interview.The query is from Cytoplasmic Membrane Systems topic in section Cytoplasmic Membrane Systems of Cell Biology

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The correct answer is (a) integral membrane proteins

The explanation: Unlike SECRETORY and lysosomal proteins, integral membrane proteins are not completely synthesized in the ENDOPLASMIC reticulum. ONE more or hydrophobic segment of these proteins are shunted DIRECTLY from the translocon to the phospholipid bilayer.
Discussion
104.

All the cells contain the same ratio of rough and smooth endoplasmic reticulum.(a) True(b) FalseThis question was addressed to me in my homework.The above asked question is from Cytoplasmic Membrane Systems topic in chapter Cytoplasmic Membrane Systems of Cell Biology

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The correct answer is (B) False

The explanation: RIBOSOMES are associated with the cytosolic space of rough endoplasmic RETICULUM hence they are more actively involved in PROTEIN synthesis. In cells that secrete large amount of proteins e.g. the cells of kidneys and salivary glands, more number of RER are present. Hence the ratios of SER and RER vary depending on the cell TYPE.
Discussion
105.

After the synthesis of proteins in endoplasmic reticulum, where do they reach before being secreted from the cell?(a) Lysosomes(b) Golgi complex(c) Lysozymes(d) NucleusThis question was posed to me during an interview for a job.The query is from Cytoplasmic Membrane Systems topic in chapter Cytoplasmic Membrane Systems of Cell Biology

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The correct option is (B) GOLGI complex

To ELABORATE: After being synthesized in the ENDOPLASMIC reticulum, proteins travel through and reach the Golgi complex where they are modified finally reaching the plasma membrane and being discharged from the cell.
Discussion