BIOL 1090 Lecture Notes - Lecture 4: Lynn Margulis, Endoplasmic Reticulum, Endomembrane System

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23 Nov 2016

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Certain organelles of the eukaryotic cell have evolved from smaller prokaryotic cells that have taken up residence within the cytoplasm of a larger host cell. E(cid:454)te(cid:374)si(cid:448)e (cid:374)et(cid:449)ork of (cid:373)e(cid:373)(cid:271)ra(cid:374)ous (cid:272)a(cid:374)als a(cid:374)d sta(cid:272)ks of (cid:862)sa(cid:272)s(cid:863) = (cid:272)ister(cid:374)ae. The combined surface area of cytoplasmic membranes is many times greater than the. Endo-membrane organelles are part of a dynamic system in which materials are shuttled back and forth from one part of the cell to another. The organelles of the endo-membrane system are functionally distinct from one another: contain a particular set of proteins, perform a unique set of activities, provides compartmentation and functional diversity, conserved in eukaryotes, dynamic structures. Almost nothing inside a cell has a fixed shape. This is important to maintain a dynamic system. Constituitve materials transported in secretory vesicles and continuously discharged into extracellular space. Regulated materials are stored as membrane-bound packages that are discharged only in response to a specific stimulus.

Related Questions

Please match the following:Nucleus, cytoplasm, plasma membrane, ribosome, rough endoplasmic reticulum, smooth endoplasmic reticulum, golgi apparatus, vesicles, lysosomes, central vacuole, mitochondrion, chloroplast, cell wall, cytoskeleton, gap junction, tight junction, plasmodesmataA. Structure between cells that forms leak proof sheetB. Stacks of membrane sacs that receive and modify protein products coming from the rERC. Fluid-Filled space between the plasma membrane and the nuclear membrane where organelles are suspendedD. Supports cell, maintains cell shape, acts as tracks for organelle movementE. Cellular respiration, bulk of ATP productionF. Outer border of plant cellsG. Storage, digestion, maintains, turgor pressure in plantsH. Genetic control center, directs cellular activitesI. Selective barrier of all cellsJ. Converts solar energy to chemical energyK. Structure that allows substances to flow from one cell to another cellL. protein factoryM. digestive compartment in animal cellsN. synthesis, modification, and packaging of proteinsO. transport shuttle busesP. stacks of tubules where carbohydrate and lipid are producedQ. Channels connecting neighboring plant cells

brownwoodchuck820

Please match the following:

Nucleus, cytoplasm, plasma membrane, ribosome, rough endoplasmicreticulum, smooth endoplasmic reticulum, golgi apparatus, vesicles,lysosomes, central vacuole, mitochondrion, chloroplast, cell wall,cytoskeleton, gap junction, tight junction, plasmodesmata

A. Structure between cells that forms leak proof sheet
B. Stacks of membrane sacs that receive and modify protein productscoming from the rER
C. Fluid-Filled space between the plasma membrane and the nuclearmembrane where organelles are suspended
D. Supports cell, maintains cell shape, acts as tracks fororganelle movement
E. Cellular respiration, bulk of ATP production
F. Outer border of plant cells
G. Storage, digestion, maintains, turgor pressure in plants
H. Genetic control center, directs cellular activites
I. Selective barrier of all cells
J. Converts solar energy to chemical energy
K. Structure that allows substances to flow from one cell toanother cell
L. protein factory
M. digestive compartment in animal cells
N. synthesis, modification, and packaging of proteins
O. transport shuttle buses
P. stacks of tubules where carbohydrate and lipid areproduced
Q. Channels connecting neighboring plant cells

harlequinmoose866

Question 401 pts

Kinetic energy is the stored energy that can be used for motion.

True

False

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Question 411 pts

When an electron is transferred from one atom to another, and the two atoms are then electrically attracted to one another, a(n) ________________ bond is formed.

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Question 421 pts

Changing the number of ____________ of an atom would change the chemical properties of the atom.

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Question 431 pts

Forming molecules and breaking down molecules in biological organisms usually requires the use of _________ to help the reaction proceed faster.

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Question 441 pts

Organic molecules have a core composed of .

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Question 451 pts

The building blocks of carbohydrates are

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Question 461 pts

Water molecules crossing a membrane from high to low concentration is .

active transport

cell fate

facilitated diffusion

osmosis

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Question 471 pts

Choose the membrane molecule responsible for the passage of polar molecules and ions into and out of the cell.

phospholipids

transmembrane channel proteins

cell surface proteins

carbohydrate chains

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Question 481 pts

The simplest cells are .

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Question 491 pts

Which of the following membrane bound organelles are found inside bacterial cells:

nucleus

organelles are not found in prokaryotic cells

mitochondria

chloroplasts

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Question 501 pts

Which of the following is a specialized components of the cell, is associated with the rough endoplasmic reticulum, and is responsible for making proteins.

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Question 511 pts

Proteins are sorted, modified, and packaged by the _____________ and later transported to the outside of the cell.

ribosomes

golgi bodies (golgi apparatus)

nucleus

mitochondria

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Question 521 pts

Dehydration synthesis is a process of linking two smaller subunits together to form a polymer. Which of the following statements below is true of dehydration synthesis?

Oxygen is consumed.

A water molecule is removed from the molecules.

A water molecule is added to the molecules

Carbon dioxide is given off.

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Question 531 pts

Proteins are made up of _________ held together by peptide bonds.

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Question 541 pts

Which of the following gives an amino acid its properties?

NH2

R Group or functional group

COOH

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Question 551 pts

The final three-dimensional shape of a protein that includes the bonding of two or more polypeptide chains is call its _____ structure.

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Question 561 pts

How do DNA and RNA differ?

all statements are differences between DNA and RNA.

DNA is double stranded while RNA is single stranded.

They have different sugars.

Thymine is present in DNA but not in RNA.

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Question 571 pts

Which of the following is a component of a DNA nucleotide?

phosphate

a nitrogen containing base

All are components of a nucleotide.

5-carbon sugar

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Question 581 pts

Cell membranes are made up of several different types of molecules. Select the membrane molecule below that is made up of a polar region and two non-polar fatty acid tails.

transmembrane proteins

carbohydrate chains

phospholipids

cell surface proteins

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Question 591 pts

Two organelles which are believed to have once been free-living bacterial cells are ____________ and ______________.

chloroplasts and mitochondria

golgi apparatus and endoplasmic reticulum

ribosomes and nucleolus

peroxisomes and lysosomes

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