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Contemporary Issues in Biology Week 3 Notes

by: Kaley Hicks

Contemporary Issues in Biology Week 3 Notes BIOL 10003

Marketplace > Texas Christian University > Biology > BIOL 10003 > Contemporary Issues in Biology Week 3 Notes
Kaley Hicks
GPA 3.97

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About this Document

Material covered in class of Week 3
Contemporary Issues in Biology
Dr. Sawey
Class Notes
Biology, Contemporary Issues in Biology, DNA, Chromosomes
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This 1 page Class Notes was uploaded by Kaley Hicks on Sunday January 31, 2016. The Class Notes belongs to BIOL 10003 at Texas Christian University taught by Dr. Sawey in Winter 2016. Since its upload, it has received 38 views. For similar materials see Contemporary Issues in Biology in Biology at Texas Christian University.


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Date Created: 01/31/16
Week 3 Contemporary Issues in Biology Class Notes January 26, 2016 Class Notes  1 in 4 men over 65 struggle with impotence  Question: A man has a radical prostatectomy and becomes impotent. Physiologically, he can Viagra help him overcome impotence? o Viagra prolongs the effects of cyclic gmp by blocking the enzyme (PDE5) that breaks it down -Today’s Lecture: Human Development and Stem Cells -Life Cycle of Humans: Chart ** Know  Sex cells: gamete  Zygote: fertilized egg  23 chromosomes from dad, 23 from mom = 46 -Human Development Involves:  Addition of more cells through mitosis  Creation of adult cells with special functions through cell differentiation, creating about 210 tissues in the body -Mitosis of Body Cells  Result of mitosis = exact copy of cell you started with  Don’t need to know prophase, metaphase, etc.. -Human Development to Implantation  Fertilization occurs in the Fallopian tubes -Stages of Human Development  56-60 days = fetus -What are Stem cells?  Non specialized cells -2 kinds of stem cells  Embryonic: most potential for differentiation  can become nearly any type… -Where do stem cells come from  Embryonic stem cells o Blastocyst (4-5 days after fertilization) January 28,2015 Class Notes -Embryonic Cells are undifferentiated cells in the Blastocyst -Dna: beyond: the big picture  DNA contains the instructions for life  Each person has a unique complement of DNA which causes each person to have a unique composition of proteins o Leads to unique appearance and behavior -How many chromosomes are in a sperm cell? 23 -Functions of Protein  Structural:muscle, hair ; Chemical: antibodies, hormones, enzymes -What are proteins made of?  Proteins are chains of amino acids [20 amino acids in each protein] -DNA has 4 nucleotides -How do we make millions of different proteins out of only 20 different amino aids?


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