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Question:I know that I have to do my homework on my own...but i saw this quiz and i don't know any of the answers! I really need help! Please Answer this question! 1. What type of bond is a water molecule an example of? How did you come to this conclusion? Discuss the different factors that support your decision. 2. Examine the process know as the scientific method. List each of the steps in order, and explain what occurs in each step and why it is important. 3. Using the Periodic Table of Elements discuss the properties of the element Boron (B). What is its Atomic Number? What is its Atomic Mass Number or Atomic Weight (round to the nearest whole number). How many protons does it have? How many electrons? How many neutrons? Discuss how each of these factors relate to one another. What formulas can help you answer this question? 4. What is the difference between an ionic bond and a covalent bond? Be specific and include examples to illustrate your point. 5. Discuss the four major groups of organic compounds. Explain in full what each one is and what role they play.

Answers:1. polar covalent (see excerpt from the link following): "A good example of a polar covalent bond is the hydrogen-oxygen bond in the water molecule." (scroll to "Polar and nonpolar covalent bonding") http://www.visionlearning.com/library/module_viewer.php?mid=55 2. scientific method: http://science.howstuffworks.com/innovation/scientific-method6.htm 3. this excerpt is from the link following: "...boron (B) has an atomic mass of 10.81 and an atomic number of 5. When you round 10.81 to the nearest integer, the result is 11. When you subtract the number of protons (equal to the atomic number) from the atomic mass, the result is 6. Therefore, the most common isotope of boron has 6 neutrons." (scroll down to "Number of Neutrons") http://www.chemicalelements.com/sup/help.html 4. http://wiki.answers.com/Q/How_is_a_covalent_bond_different_from_an_ionic_bond 5. http://webcache.googleusercontent.com/search?q=cache:eX2VcOiyR6oJ:faculty.mdc.edu/mdelcamp/Impatica_Organic_Compounds/Impatica_Organic_Compounds/3_Pres_Organic_Compounds_Presentation_ppt.ppt&cd=4&hl=en&ct=clnk&gl=us

Question:Hi all. These are questions from biology 101 class. This chapter is pretty tough and hardly can find any answers. Please take your time and help. I did manage to answer couple, and there are ones I couldn t answer at all. You don t have to answer all. But please answer on ones you know for sure and only. Thank you all so much in advance! 1) Which of the following is a source of new alleles within a population? a.genetic recombination b.meiosis c.mutation d.genetic drift e.natural selection 2) The black-bellied seedcrackers of Cameroon a.have bills either 12 or 15 mm wide. b.prefer soft seeds. c.sustain intense competition for scarce seeds during times of drought. d.provide an example of disruptive selection. e.all of these 3) Sexual dimorphism has arisen as a result of a.stabilizing selection. b.heterozygote superiority. c.kin selection. d.sexual selection. e.directional selection. 4) Genetic drift a.leads to a loss of diversity in a population. b.requires small populations. c.occurs in populations with the founder effect. d.occurs following a bottleneck. e.all of these 5) Island populations do NOT exhibit which of the following when compared to the mainland populations from which they are derived? a.greater variability b.greater extinction rates c.fewer heterozygous loci d.large chance fluctuations in allele frequencies e.less genetic drift Matching For the following statements select the best choice of the four evolutionary processes listed. a.mutation b.gene flow c.genetic drift d.natural selection ____C26.This is most likely to lead to the loss of genetic variation in a small population. ____27.This process produces new genetic variation within a species. ____28.This process can rapidly offset the effects of genetic isolation when two populations come into secondary contact. ____D29.The reduced contribution of one phenotype in comparison to another to the next generation is an example of this. ____30.The occurrence of mimicry is best explained as the ultimate result of this process.

Answers:1 - (C) mutation 2 (d) provide an example of disruptive selection. www.biol.wwu.edu/hooper/204_2006_06microevo.ppt 3 (D) sexual selection 4 (E) 5 (E) 26 C-genetic drift 27 A-mutation 28 B-gene flow 29 D-natural selection 30 D-natural selection

Question:

Answers:suggestions / examples -- PowerPoint http://docs.google.com/viewer?a=v&q=cache:PznwoSmU4T0J:www.worldofteaching.com/powerpoints/biology/AlCOHOL.ppt+ppt+about+alcoholism&hl=en&gl=us&pid=bl&srcid=ADGEESgc_RRMhYMY5f0UWAOV6oDDQAkIU083Fg8W8sYSnUNKi5nQsjas8keVeib9xW64rZg_oJriHJj6KEp-P5Of9zdI31whKmscn8HSEmRQ18lgiy7w1idD07qNHdv8eSbWpv3jUPXo&sig=AHIEtbTzsx64NJ-Mbk6hKuMiLk5B7oPt4w YouTube http://www.youtube.com/watch?v=Ne8hOaUyGSk&feature=related http://www.youtube.com/watch?v=H6sbtO0RoC8&feature=related http://www.youtube.com/watch?v=kigNy2PWzdg other http://www.super-science-fair-projects.com/image-files/alcoholbadisabella.jpg

Question:A sample of air contains 80% N2, 18% O2, and 2% other gases. If the air pressure today is 102.6 kPa, what is the partial pressure of each gas?

Answers:Partial pressure is directly proportional to the percentage of a gas in a mixture. In order to calculate the partial pressure of a gas, you will multiply the decimal equivalent of the percentage of a given gas by the total pressure of the system. The general formula would be: partial pressure (P) = % of gas X total pressure total pressure is given as 102.6 kPa and percentage of N2 in mixture = 80% so partial pressure of nitrogen = 80% X 102.6 = 80/100 X 102.6 = 82.08 kPa similarly partial pressure of O2 = 18% X 102.6 = 18/100 X 102.6 = 18.47 kPa and partial pressure of other gases = 2% X 102.6 = 2/100 X 102.6 = 2.05 kPa see this link-- http://74.125.153.132/search?q=cache:uuAKGdjlEpMJ:www.occc.edu/biology/Documents/AandPII/Unit_4_%2520Respiratory%2520Physiology.ppt+how+to+calculate+partial+pressure+from+percentage+of+gases&cd=4&hl=en&ct=clnk&gl=in

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The Life Topics Science Unit Part III / IV - Download .ppt at www.sciencepowerpoint.com :This is Part III of IV of an educational Powerpoint titled "The Life Topics Unit" that covers BIology / Chemistry / and Health Topics. The Powerpoint version of this video and entire unit can be downloaded at sciencepowerpoint.com Teaching Duration = 5 weeks The Life Topics Unit is intended for students in grades 7-10 and includes an interactive and engaging Powerpoint Presentation of 1100+ slides with built in class notes (Red Slides), lab activities, project ideas, discussion questions, assessments, challenge questions with answers, review games, videos, and much more. Text is provided in large print (32 font) and is placed at the top of each slide so it can seen and read from all angles of a classroom. A shade technique and color coded text helps to increase student focus and allows teacher to control the pace of the lesson. Also included is a 12 page (Microsoft 2003 word doc.) assessment / bundled homework package that chronologically follows the Powerpoint slideshow as well as a 8 page modified assessment. 13 pages of class notes (Word doc.) with images are also included for students who require assistance, as well as answer keys to both of the assessments for support professionals, teachers, and homeschool parents. 22 video shorts (FLV files) are provided and a slide within the slideshow cues teacher / parent when the videos are most relevant to play. Video shorts usually range from 2-7 minutes and are included in organized folders. Two Powerpoint review games (125+ ...