BIOL 1090 Lecture Notes - Lecture 18: Tethering, Glycolipid, Cisterna

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16 Dec 2017

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Protein is transported from er to golgi complex. Exit sites: membrane and er lumen bud off to form transport vesicles. Er-golgi intermediate compartment (ergic: region b/w er and golgi complex, transport vesicles fuse to form larger vesicles and interconnected tubules . Vesicular tubular clusters (vtcs: these then form the cis-golgi network, which gives rise to the golgi complex. Note: exit sites of er don"t have ribosomes to prevent them from moving away with a partially packaged protein: named after camillo golgi, who discovered the structure and won the nobel prize for. Structure of golgi complex doing so in 1906. In a cell, there can be a single golgi body or there can by many golgi bodies, which are referred to as dictyosomes. Functions of golgi complex processing plant of cell synthesis of complex polysaccharides: modification of proteins and lipids, glycosylation (glycoproteins and glycolipids, proteolytic modification transport and sorting of proteins.

Related Questions

1.Bacteriorhodopsin is a protein that has 7 alpha helices embedded in the cell membrane. As such, how many start-transfer and stop-transfer sequences would it need?

7 start transfer sequences, 6 stop transfer sequences

7 of each, in alternating fashion

4 start transfer sequences and 3 stop transfer sequences

7 start transfer sequences

2. The role of GTP hydrolysis by the Signal Recognition Particle during cotranslational translocation to the ER is

to release the SRP after docking to the translocon so translation can resume.

to open the gate/pore of the translocon into the ER.

to arrest translation so that synthesis does not finish before the peptide is delivered to the translocon.

to allow binding to the ribosome.

3. The cisternal maturation model is just one model that describes how objects might move through the Golgi. Some of the statements below describing the cisternal maturation model are correct and some are incorrect. Select all the incorrect descriptions.

There's no need for retrograde movement

Vesicles bud off from the Trans Golgi Network toward the plasma membrane

Vesicular tubules move materials from the cis to medial Golgi networks.

There are no vesicles moving in the anterograde direction

4. Select all statements that are correct concerning electron transport and ATP synthesis during photosynthesis in chloroplasts.

Each photosystem (I and II) pump protons.

Protons are pumped into the lumen of the thylakoid.

The bulb of the synthase projects into the stroma

Photosystem I is reduced directly by Photosystem II

5. Select all that are true about ATP synthesis with an F_oF₁ synthase complex.

Each ADP+Pi is transferred from one beta subunit in Open conformation to a second beta subunit in Loose conformation and finally to the 3rd beta subunit in the T conformation

As the gamma subunit rotates to each beta subunit, it forces them to the open state.

As the gamma subunit rotates to a particular beta subunit, the unit before it changes conformation to Tight and the one ahead of it changes to Loose

As the gamma subunit rotates to a particular beta subunit, the unit before it changes conformation to Loose and the one ahead of it changes to Tight

All 3 beta subunits are always in a different conformation (open, loose, or tight)

6. The number of ATPs per NADH generated by the electron transport system is higher than the number generated per FADH2 because __________.

		electrons from FADH₂ are not oxidized all the way to water
		NADH is converted to NAD⁺, which increases the charge gradient for ATP synthesis
		FADH₂ has a lower (less negative) redox potential than NADH does
		FADH₂ has a higher (more negative) redox potential than NADH does

BIOL 1090 Lecture Notes - Lecture 18: Tethering, Glycolipid, Cisterna

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