Exam 1 Essay

Submitted By apete29
Words: 983
Pages: 4
Open Document
about 15 trillion cells make up a single adult human * about 180 thousand+ years ago was the first Homo sapiens to appear on earth * cell theory all cells come from preexisting cells theory of natural selection a hypotheses is not a theory but it is an explanation hypotheses how did life begin?
(theory/belief life is spontaneously generated) has not been proven so today we can state a fact that life is not spontaneously generated. a few centuries ago: people thought that new living things appeared all the time spontaneous generation refuted mid 1800s Louis Pasteur broth in flask is boiled to kill preexisting microorganisms as broth cools, condensing water collects, sealing the mouth of the flask if the neck is later broken off, outside air can carry microorganisms into broth conditions on early earth atmosphere: CO2; CH4; NH3; H2; N2; HCl; H2S; H2O similar to oxygen no free oxygen frequent storms with a lot of lightening frequent volcanic eruptions frequent meteor impacts
UV light from the sun no ozone layer earth before life arose earth is about 4.6 billion years old radiometric dating of meteorites and moon rocks life arose about 4.1 billion (4.1,000,000) years ago chemical traces in rocks 4 billion years old fossil bacteria in rocks 4 billion years old first single cell fossils – prokaryotes no spontaneous generation now, but must have happened then the experiment od miller and urey purified water gases of primeval atmosphere electric spark simulates lighting storm organic molecules appear after only a few days tried to create conditions of early life to determine how life began noticed water began to have pigment and determined it was the beginning of the building blocks of life organic molecules appeared but no life was successfully created how to assemble a living thing accumulation of organic molecules catalyze reactions (catalyze speeds up) proteins or RNA molecules reproduce from stored genetic information (DNA) separate the living thing from the outside environment the chicken or the egg? now: DNA RNA protein (central dogma of biology) need proteins to synthesize more DNA so how did earliest cells do it? ribozymes: means RNA enzymes
RNA molecule that can catalyze reactions, especially those involved in synthesis and processing of RNA itself conclusion: earliest cells used RNA to store information ribozymes to catalyze rxns viruses are NOT living things they can NOT reproduce on their own they use RNA hydrophobic hate (separate from each other) hydrophilic love (stick together) microshperes as proto-cells just add fat and protein to water then shake to mix water and fat add soap. in your body the soap figure is bile which is made in the liver and stored in the stomach. soap and bile
1 part hydrophilic
1 part hydrophobic proto = before protobionts systems that are considered to have possibly been the precursors to prokaryotic cells. if RNA is trapped inside, the system can use the RNA or select for it. * * water + elements + energy

* prebiotic soup * amino acids, mucleotides, lipids, sugars * microsphere like protocels surrounding more complex organic molecules like – RNA, carbohydrates, proteins, lipids

first prokaryotes

* ****only way we know how life came about on earth****
“family tree” of life phylogeny / evolutionary tree three groups(domains) of the tree eukarya archaea bacteria (prokarya) we as humans are in the eukarya domain because we are eukaryotes. as Homo sapiens we all share common ancestors prokaryotes cam first (about 2 billion years ago) single-celled – protists multicellular animals and fungi share the most common ancestors our most recent ancestor is ___________ possible test question are we closer related
Show More

Related Documents: Exam 1 Essay

EXAM 1 Essay

EXAM 1 : 96/100 Question 1 Answer saved Marked out of 2 Flag question Question text The _________ has the power to interpret the laws of the United States and the states. Select one: a. The Executive Branch b. The Legislative Branch c. The Judicial Branch d. All of the above e. None of the above Question 2 Answer saved Marked out of 2 Flag question Question text What are the three branches of the United States government? Select one: a. Legislative, Executive, and Judicial b. Legislative, Executive…

Words 2904 - Pages 12

Essay on exam 1

Alia Whitney September 18, 2014 The three greatest Western African trading states were Ghana, Mali, and Songhay. Starting as early as 300 ce with Ghana and ending the Songhay. The kingdom of Ghana marked the beginning of a series of empires that were involved in extensive commercial trade in West Africa. The kingdom of Ghana also known as “the land of gold”. Gold was traded for salt in Ghana which came from the Sahara desert. The kingdom of Mali includes all of Ghana. Mali was the second largest…

Words 318 - Pages 2

Essay about 1 The Exam

Hand-out 1 – F584 Exam The Structure Section A: Questions based on a case study (25 marks) Section B: A selection of 3 x 2 part questions. You answer one question (parts A and B) only. (35 marks) The exam is 2 hours long and is worth a total of 60 marks Section A You need to carefully read the case study and highlight the key points You should spend 50 minutes on this section 2 minutes per mark ‘Define’ questions These are worth 1 or 2 marks. You need to learn the textbook definitions so you are…

Words 805 - Pages 4

Marketing exam 1 Essay

MGM 301- Exam #1 Study Guide Chapter 1- Creating Customer Relationships and Value Through Marketing Marketing: the activity for creating, communicating, delivering, and exchanging offerings that benefit the organization, it’s stakeholders, and society at large - more broad than advertising and selling - stresses the importance of delivering genuine benefits to customers To serve buyers and sellers, marketing needs to: 1.) discover the needs and wants of prospective customers 2…

Words 1636 - Pages 7

Exam 1 Essay

TEST 1 Contour: The overall shape of a melodic line. It can move upward or downward or remain static. Conjunct: Smooth, connected melody that moves principally by small intervals Disjunct: Disjointed or disconnected melody with many leaps. Interval: The distance and relationship between 2 pitches Beat: Regular pulsation; a basic unit of length in musical time. Meter: Organization of rhythm in time; the grouping of beats into larger, regular patterns, notated s measures Syncopation: Deliberate…

Words 520 - Pages 3

Exam 1 Essay

Whatis operations management? Operations is the set of activities associated with the creation, production, distribution and delivery of the organization's goods and services. Operations management (OM) is the science and art, of ensuring that goods and services are created and delivered successfully to customers. Why is operations management important to business? Operations management is the management of productive resources that are used to create salable products or services. It is that sale…

Words 780 - Pages 4

Essay Exam 1 Note

Human Resource Management I. HRM Overview: a) Major HRM Functions 1. Planning/Strategy: planning falls under staffing in HRM 2. Staffing: planning, selection, recruiting, lay off, dismissal 3. Training: need efficiency, development 4. Compensation: developing salaries, pay-for-performance, benefits 5. Labor Relations: unions 6. Performance Appraisal: one year evaluation, performance management b). Goals of HRM 1. Productivity 2. Quality of Work Life 3. Legal Compliance: operating w/in…

Words 774 - Pages 4

Exam 1 Fall2014 Essay

MSOR/MKMR/OPMT475: Exam-I Due: November 6th, 2014 Name (print):___________________________ Note: This is an individual exam!! You should not discuss any aspect of the exam with fellow students, or share any computer input or output files. Receiving or offering help in an exam is against the school’s academic integrity policies – any violation can result in serious consequences. If you need any clarification, feel free to contact me. You can stop by my office or send me an email. You should…

Words 1010 - Pages 5

Essay on Che113 Exam 1 Review 1 1

Chemistry 113 Exam 1 Review Starting with benzene, determine what product(s) you would form using the following reagents: You may need one, two or three different combinations to obtain a product. KMnO4, H3O+ ClCO(CH2)2CH3, AlCl3 Br2, FeBr3 CH3CH2CH2CH2Cl, AlCl3 Cl2, FeCl3 H2/Pd CH3Cl, AlCl3 NBS, peroxides HNO3, H2SO4 (CH3)3CCH2Cl Be prepared to identify all aromatic activators and deactivators, in addition to the ring positions each affects. Various substances discussed in lecture have…

Words 556 - Pages 3

Study Guide For Exam 1

Study Guide for Exam 1 I. Argument Identification: Be able to determine if a passage has an argument in it. If it does, you will be asked to underline the conclusion and circle the relevant indicator words. (You’ll find practice exercises on Blackboard.) a. Premise Indicators – These words usually, but not always, indicate that what follows is a premise. The statement that comes after one of these words or phrases will usually be a premise (evidence) that supports a conclusion. (Note:…

Words 1752 - Pages 8