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Science Notes
Science Notes

... -For animal cells, when they are placed in a hypotonic solution, (higher surrounding water potential) water will enter through osmosis (net movement of water into the cells) and the cells will swell, eventually burst as animal cells do not have cell walls to protect them. It is called lysis. -For an ...
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... Debbie was doing a science lab, and she was instructed to decide whether a piece of plastic would float or  sink without actually putting the plastic in the water. How could she do this?   ...
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... a. this joining of sex cells is called fertilization b. a fertilized egg is called a zygote and contains a full set of genetic information c. fertilization in some animal species takes place outside the body – this is called external fertilization 1) salmon and frogs are examples d. fertilization is ...
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... the palisade layer and the lower epidermis. The air spaces between the spongy cells allow for gas exchange. Mesophyll cells (both palisade and spongy) are packed with chloroplasts, and this is where photosynthesis actually occurs. Epidermis also lines the lower area of the leaf (as does the cuticle) ...
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Basic Biological Principles

... which part of the body they are located. All cells come from other cells, and they divide by mitosis or meiosis. Cells contain organelles and the genetic information of an organism. Tissues are composed of many cells that work together to perform a specific function. Tissue covers most parts of an o ...
Biology/Life Science Review - St. Joseph School (Garden City)
Biology/Life Science Review - St. Joseph School (Garden City)

... • Cells are the basic unit of structure and function of living things. • This means that cells: • Make up all living things. • Provide instructions for what the organism is supposed “to do”. • Provides the outline for what the organism is supposed “to look like”. ...
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... (b) Turn the coarse adjustment knob to lower the body tube until the objective is close but not touching the slide. (c) Look down through the eyepiece and turn the coarse adjustment knob to raise the body tube slowly until the specimen comes into focus. (d) Turn the fine adjustment knob for fine adj ...
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Laboratory Exercise 20: Embryology and Fetology

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Embryonic stem cell



Embryonic stem cells (ES cells) are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage preimplantation embryo. Human embryos reach the blastocyst stage 4–5 days post fertilization, at which time they consist of 50–150 cells. Isolating the embryoblast or inner cell mass (ICM) results in destruction of the blastocyst, which raises ethical issues, including whether or not embryos at the pre-implantation stage should be considered to have the same moral or legal status as more developed human beings.Human ES cells measure approximately 14 μm while mouse ES cells are closer to 8 μm.
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