BSCI 330 Lecture 29: Unit 4

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rubysea-lion716

20 Jul 2015

School

University of Maryland

Department

Biological Sciences Program

Course

BSCI 330

Professor

Cao/ Woodham

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Document Summary

Cytoskeleton compartments: microtubule, centrosome with pair of centrioles, actin filaments. Rapid changes in cytoskeleton organization during cell division (page 2) Endocytosis clathrin mediated endocytosis and phagocytosis. 1. 2 cytoskeleton outline: three types of major filaments, actin filaments, microtubules c. Intermediate filaments: principles underlying polymerization, nucleation, elongation, steady state, regulation of cytoskeleton, accessory proteins, signal induce changes in cytoskeletal arrangement, and so cell behavior. 2 protofilament (f actin) head to tail. The polarity is generated from the subunit of g actin (plus and minus) head to tail fashion to form 1 protofilament. Similar to g-actin, alpha-tubulin has a pocket for energy. Heterodimer is made up of alpha and beta-tubulin. Head to tail fashion protofilament will keep the polarity of the alpha beta keto. Microtubule is made up of 13 protofilaments in a parallel fashion. Laminopathies: muscular-dsytophy, cadiomyopathy, restrictive dermopathy, lidodystrophy, hgps. Much less is known about if assembly, disassembly, and dynamicity. Percentage of tubulin molecules in microtubules increases over time (same graph)

Related Questions

QUESTION 30

The function of centrosome is:

	1.	Microtubule initiation and organization in animal cells
	2.	Organization of thin filaments
	3.	Depolymerization of microtubules
	4.	Organization of intermediate filaments

2.5 points

QUESTION 31

The destinations of proteins synthesized on "free" ribomsomes include:

	1.	Endoplasmic reticulum
	2.	Nucleus
	3.	Mitochondria
	4.	Lysosomes

2.5 points

QUESTION 32

Microtubules can be assembled and disassembled quickly in response to the cellular changes is because:

	1.	Cells synthesize tubulin proteins very fast.
	2.	Cells can turn other cytoskeletal filaments into microtubules
	3.	Microtubules have an instable plus end and microtubules are probably organized by weak non-covalent interactions
	4.	The motor proteins of microtubules can organize the microtubules in response to the cellular changes

2.5 points

QUESTION 33

Both signal recognition particle and a translocon in rough endoplasmic reticulum membrane can recognize and bind to the signal sequence of a secretory protein, so they play the exact same role during protein co-translational translocation.

True

False

2.5 points

QUESTION 34

Rough endoplasmic reticulum is so named is because:

	1.	It has many proteins associated with its surface.
	2.	It has ribosomes associated with its cytosolic surface.
	3.	It is associated with nuclear membrane.
	4.	It has vesicles budding off its surface.

2.5 points

QUESTION 35

The membrane vesicles that transport materials between membrane compartments have a protein coat. The protein coat has similar functions in different vesicles. These functions include:

	1.	Help the enclosed material fold correctly.
	2.	Help degrade the protein in the vesicles
	3.	Maintain the internal pH of the vesicles
	4.	Function as mechanical device to form a vesicle and select the components to be carried by a vesicle.

2.5 points

QUESTION 36

Lysosomes are important for:

	1.	Receptor-mediated endocytosis.
	2.	Breaking down foreign particles brought into the cells by endosomes
	3.	Regulating the process of organelle turnover.
	4.	Protein trafficking between membrane compartments

2.5 points

QUESTION 37

Which of the following is correct about membrane biosynthesis?

	1.	Membranes are synthesized in Golgi Complex.
	2.	Membranes arise from preexisting endoplasmic reticulum membranes.
	3.	Membranes are synthesized on ribosomes.
	4.	Membranes of all organelles have the same composition of proteins and lipids, since they all originate from endoplasmic reticulum.

2.5 points

QUESTION 38

During skeletal muscle contractions, the shortening of the muscle fibers is because of:

		The shortening of the thin and thick myofilaments.
		The shortening of the cytoskeletal filaments.
		The kinesin proteins moving over microtubules.
		The actin and myosin filaments sliding over each other.

2.5 points

QUESTION 39

The assembly and disassembly of microtubules is regulated by rate of growth and shrinkage of the plus end.

True

False

2.5 points

QUESTION 40

The functions of Golgi complex include:

	1.	O-linked oligosaccharides and most of a cellâs complex polysaccharides are assembled in Golgi complex
	2.	Cis Golgi complex sorts proteins
	3.	Trans Golgi complex segregates proteins in different types of vesicles for dilevery.
	4.	N-linked oligosaccharides are further processed in Golgi complex

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BSCI 330 Lecture 29: Unit 4

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