quizz bio

The endomembrane system

• Appears in prokaryotic cells to provide an efficient use of energy because they are toosmall

• Appears in eukaryotic cells to organize cell metabolism because they are too big

• Appears in Prokaryotes and Eukaryotes to ensure survival

• Appears in Eukaryotes to provide an efficient use of energy because they are too small

Which of the following processes involves signal peptides?

• Cytoplasmic protein synthesis

• Hydrolases targeted to the lysosome

• Endoplasmic reticulum-bound protein synthesis

• Microtubule driven transport

Transport through the nuclear envelope

• Requires a lot of Energy expense as ATP, and cargo is released when nucleoporinschange their conformation

• Requires a lot of Energy expense as ATP, and cargo is released when importins orexportins change their conformation

• Requires a lot of Energy expense as GTP, and cargo is released when nucleoporinschange their conformation

• Requires a lot of Energy expense as GTP, and cargo is released when importins orexportins change their conformation

Protein O-glycosylation occurs

• On Serine or Threonine amino acids

• In every Asparagine the growing peptide shows

• In any amino acid with an oxygen in a side chain

• Everytime the sequence Asn-aa-Ser appears, (being aa any amino acid)

Among the proteins that conform the membrane of the Rough Endoplasmic Reticulum(RER) are:

• SRP receptor, protein translocator, acyltransferase, phosphatase

• Oligosaccharyl transferase, signal peptidase, acyltransferase, phosphatase

• Cytochrome P450, Oligosaccharyl transferase, acyltransferase, phosphatase

• SRP receptor, protein translocator, oligosaccharyl transferase, signal peptidase

Golgi Body is highly involved in

• the synthesis of lipids and proteins

• a uni-directional delivery of of lipids and proteins, loaded in vesicles to plasmamembrane

• a bi-directional delivery of lipids and proteins, loaded in vesicles, to mitochondria or toplasma membrane

• the modification of lipids and proteins, forming glycolipids and glycoproteins andproteoglycans

Clathrin

• Is a transmembrane protein that forms vesicles between ER and Golgi Body

• Is a coating protein that forms vesicles between Golgi Body and plasma membrane

• Is a coating protein that forms vesicles between ER and Golgi body

• Is a transmembrane protein that forms vesicles between Golgi Body and plasmamembrane

Lysosomes are:

• Single membrane organelles loaded with hydrolytic enzymes functional at pH=5

• Single membrane organelles loaded with hydrolytic enzymes functional at pH=7

• Double membrane organelles loaded with hydrolytic enzymes functional at pH=5

• Double membrane organelles loaded with hydrolytic enzymes functional at pH=7

n the process of vesicle recognizing, which of the following proteins are involved?

• t-SNARE and Rab-effector on the vesicle and v-SNARE and Rab-GTP on the targetmembrane

• COP-II and clathrin on the vesicle and t-SNARE and v-SNARE on the target membrane

• Only t-SNARE and v-SNARE on the vesicle

• v-SNARE and Rab-GTP on the vesicle and t-SNARE and Rab-effector on the targetmembrane

The carnitine acyl-transferase systems are mitochondrial membrane proteins involvedin

• the Krebs cycle

• in fatty acid transport to the mitochondrial matrix

• the respiratory chain

• protein transport to the mitochondrial matrix