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33 Different glycoproteins can have a diverse array of oligosaccharides. Which of the statements below for making glycoproteins on plasma membrane is true?

(a) Extensive modification of oligosaccharides occurs in the extracellular space.

(b) Initial oligosaccharide chains are made by addition of one sugar at a time onto the protein in the ER lumen.

(c) Each layer of Golgi membrane structures contains identical modification enzymes for modifying sugar chain on proteins.

(d) ER lipids can be modified by sugar chain, which can be used for sugar chain modification of the proteins.

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Tod Thiel
Tod ThielLv2
28 Sep 2019

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Related questions

33 Different glycoproteins can have a diverse array of oligosaccharides. Which of the statements below for making glycoproteins on plasma membrane is true?

(a) Extensive modification of oligosaccharides occurs in the extracellular space.

(b) Initial oligosaccharide chains are made by addition of one sugar at a time onto the protein in the ER lumen.

(c) Each layer of Golgi membrane structures contains identical modification enzymes for modifying sugar chain on proteins.

(d) ER lipids can be modified by sugar chain, which can be used for sugar chain modification of the proteins.

34 In a multicellular organism, when a signal needs to be sent to most cells the signal most suited for this is a ___________.

(a) neurotransmitter.

(b) hormone.

(c) dissolved gas.

(d) plasma membrane anchored ligands.

35 Typically, members of the steroid hormone receptor family __________________.

(a) are cell-surface receptors.

(b) do not undergo conformational changes by binding to their ligands.

(c) are found mainly in the nucleus when ligand is not available.

(d) interact with signal molecules that diffuse through the plasma membrane

36 Which of the following statements about what happens when a G-protein-coupled receptor activates a hetero trimeric G protein is true?

(a) The β subunit exchanges its bound GDP for GTP.

(b) The GDP bound to the α subunit is phosphorylated to form bound GTP.

(c) The α subunit exchanges its bound GDP for GTP.

(d) It activates the α subunit and inactivates the βγ complex

37 Which of the following statements about signal transduction is false

(a) Ca2+ concentration in cytosol will increase when PLC (Phospholipase C) is activated by signal.

(b) Cyclic GMP is made in smooth muscle cells when they received NO signal.

(c) SH2 domain containing proteins can be expected to interact activated RTK.

(d) Ligand binding to RTK activates its enzyme activity then the activated RTK phosphorylates tyrosine residues on itself.

6. True or false

a_______ Nuclear pore complexes are specialized so that some mediate import and others mediate export

b_______ Membrane-bound and free ribosomes, which are structurally and functionally identical, differ only in the proteins they happen to be making at a particular time.

c_______ Some proteins can be made as either free or membrane-bound proteins. They have the same mRNA but different splicing and poly-adenylation patterns

d_______ a protein that does not have a sorting signal will be tagged for destruction by ubiquitin

e_______ when the hydrophobic signal peptide emerges from the ribosome, it is bound by SRP, which causes a pause in protein synthesis. Synthesis resumes when the ribosome with a bound SRP then binds to the SRP receptor on the cytosolic surface of the rough ER.

f________ A protein cannot leave the ER unless it is correctly folded

g________ All of the glycoproteins and glycolipids in intracellular membranes have their oligosaccharide chains facing the cytosolic side, and all those in the plasma membrane have their oligosaccharide chains facing the outside of the cell.

21) Which of the following is not primarily used for attachment?

A. glycocalyx

B. flagella

C. pili

D. fimbria

E. S layer

30) You have isolated DNA from an E. coli bacteria. The DNA would originate from what structures? (CIRCLE ALL THAT APPLY)

A. inner plasma membrane

B. mitochondria

C. microcompartments

D. nucleus

E. plasmids

31) Many cellular reactions require multiple enzymes. For efficiency, bacteria will package these enzymes together within:

A. fimbria

B. inclusion bodies

C. lysosomes

D. microcompartments

E. vesicles

32) Why can archaea be considered a separate domain from bacteria?

(CIRCLE ALL THAT APPLY)

A. Archaea ribosomal structure and protein synthesis are similar to eukaryotes.

B. They exhibit a novel method of DNA compaction.

C. Like eukaryotes, they contain simple, membrane-bound organelles.

D. Their cell walls are composed of different substances than bacterial or eukaryotic cell walls.

E. They contain a circular chromosome.

33) How are eukaryotic flagella different from bacterial flagella?

A. They are much bigger in size.

B. They move in a whip-like fashion, as opposed to a circular fashion.

C. They are covered by the plasma membrane.

D. A & B only

E. all of the above

36) The primary function of of the rough endoplasmic reticulum is:

A. aerobic respiration

B. the breakdown of phagocytized material

C. assembly of ribosomal subunits

D. polysaccharide and lipid modification of proteins

E. protein synthesis of membrane-bound and secreted proteins

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