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Why are extracellular matrices and cell walls important? (Choose ALL correct answers)

they play a large role in cellular respiration
they form a protective structure around cells
they help cells attach to each other in a multicellular organism
they help define the cell's shape

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Irving Heathcote
Irving HeathcoteLv2
28 Sep 2019

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1. How does the extracellular matrix affect a cell that it surrounds? (Select all that apply.)
The cell's shape depends in part on the structure and composition of the extracellular matrix.
The genes that the cell expresses depend in part on the types of proteins in the extracellular matrix.
The size that the cell grows to depends in part on the polysaccharides in the extracellular matrix.
The extracellular matrix has no effect on the cells that it surrounds.

All of these choices are correct.
2. Which of the following enable(s) the movement of cells?
microtubules
microfilaments
intermediate filaments
microtubules and microfilaments
microfilaments and intermediate filaments
3. Microtubules increase in length:
more quickly at one end than the other.
by growing outward from the centrosome.
in cycles, following rapid depolymerization.
if free tubulin dimers are available.
All of these choices are correct.
4. Dynamic instability is the rapid assembly and disassembly of:
microfilaments.
intermediate filaments.
microtubules.
both microfilaments and microtubules.
5. Which one of the following is a characteristic shared by integrins and cadherins?
Both are peripheral membrane proteins.
Both facilitate the adhesion of cells to extracellular matrix proteins.
Both are present in adherens junctions, desmosomes, and hemidesmosomes.
The cytoplasmic domains of both proteins are connected to the cytoskeleton.
6. Cadherin is an example of a(n):
motor protein.
intermediate filament protein.
cell adhesion molecule.
extracellular matrix protein.
7. Which is the CORRECT order from lesser to greater complexity for the following?
organs, tissues, cells
cells, tissues, organs
tissues, organs, cells
cells, organs, tissues

Week 6 Tree of LifeOn-line Work and Preparation:Tell me about the Angiosperm Phylogeny Group III system of flowering plant classification. When was it released, and why was it so important?Using the plant you are working on for your poster, break down each division of its scientific classification from Plantae through to the genus. What features allocate your plant to each of the divisions? Algonquin College BotanyFor example with tulips:Kingdom:PlantaeTulips are multicellular and photosynthesize. They are largely immobile as with all plants, and use chloroplasts to fix carbon dioxideDivision:AngiospermsTulips are flowering vascular land plants. They create a modified stem that creates a specialized reproductive organ. They produce seeds that have endosperm and a protective coating.Order:LilialesTulips are lilies – they are monocotyledonous (they form only a single cotyledon when germinating, and are perennial.Family:LiliaceaeTulips belong to Lilacaea because they have a large flower arranged into symmetry of six colored petals, two whorls, six stamens, and a large central ovary.Subfamily:LilioideaeTulips belong to Liloideae because they are found in the northern hemisphere, and have a single main bulb structure to their roots.etcWrite 500-1000 wordsUpload the document into your week 6 Discussion forum and respond to any two student’s posts.

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