BIOA01H3 Chapter 4: chapter 4

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12 Feb 2012

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4. 1 what features of cells make them the fundamental unit of life? y cells are the building blocks of life. y cell theory: Cells are the fundamental units of life. All cells come from pre-existing cells. y cell theory has three important implications: Studying cell biology is in some sense the same as studying life. The volume of a cell determines the amount of chemical activity it carries out per unit of time. Microscopes improve resolution so that cells and their internal structures can be seen. y two types of microscopes: A light microscope uses glass lenses and visible light to form a magnified image of an object. Allows the cell to maintain a more or less constant internal environment. A self- maintaining, constant internal environment (the state known as homeostasis). Acts a selectively permeable barrier, preventing some substances from crossing it while permitting other substances to enter and leave the cell.

Related Questions

Compare the surface areas, volumes, and surface area to volume ratios of two cube-shaped microorganisms if the first has a width of 2 Î¼ m and the second has a width of 20 Î¼ m. What impact will these parameters have upon the organisms' ability to grow and respond to their environments?

azureelk922

Time to move 10 microns

(typical size of animal cell)

Object radius (nm) D(cm^2/s) time (sec)

oxygen 0.2 2*10-5 0.02

sucrose 0.5 5*10-6 0.13

insulin 1.4 1.6*10-8 0.3

hemoglobin 2.5 7*10-7 0.2

HIV 100 2.2*10-10 23

bead 250 8.9*10-9 56

bacteria 750 1.8*10-10 170

1b. What would be the appropriate units for the diffusion coefficient in this example? (2). Cm^2/s

1c. What would be another set of units that might also apply to diffusion coefficients? m^2/s

2. Cell Surface to Volume issues â this question asks students to become familiar with basic formulas used to calculate surface area and volume, and to understand how much surface area and volume change when the diameter of a cell (or organism) gets larger. It also gives practice in understanding the (confusing) concept of surface area to volume ratios. Finally, an important example of biological compensation for such matters is presented.

Why is butter so difficult to wash off your hands with justwater?

		butter, a lipid, is polar and hydrophilic
		butter, a lipid, is polar and hydrophobic
		butter, a lipid, is nonpolar and hydrophlic
		butter, a lipid, is nonpolar and hydrophobic

Benedict's reagent turns dark blue in the presence ofmonosaccharides. Which of the following would cause Benedict's toturn dark blue?

		Glucose
		Albumin
		Cellulose
		DNA
		both glucose and cellulose

C) All of the following molecules are organic except

		C₆H₁₂O6
		MgCl₂
		CHNO₃
		CH₄

You are looking at a series of blocks whose surface area tovolume ratio you have calculated. Which will have the fastest rateof diffusion of substances into the center of the block?

		surface area to volume ratio of 10
		surface area to volume ratio of 5
		surface area to volume ratio of 2
		surface area to volume ratio of 0.1

BIOA01H3 Chapter 4: chapter 4

BIOA01H3 Full Course Notes

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