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BIO 121 EXAM 3 STUDY QUESTIONS AND CORRECT ANSWERS

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The early earth's atmosphere had almost no free oxygen (O2). Now it is almost 20% O2. Where did all this O2 come from? Photosynthesis Endocytosis and exocytosis are important for what? Endocytosis- vesicle pinches inward and moves a bubble of solutes into cells, membrane dissolves in cell and free...

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BIO 121 Final Exam Questions and Correct Answers

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What does Descent with Modification mean? Passing of traits from parents to offspring What is evolution? Change over time How are genes involved in natural selection? genetic mutations that are beneficial to an individual's survival are passed on through reproduction Who contributed to the main ...

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BIO 121 Exam 5 Review Questions and Correct Answers

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Lamarck's hypothesis of "inheritance of acquired characteristics". an individual adapts in its lifetime, and that this adaptation is passed on to the next generation. the various example of inspiration that led Darwin to develop his idea Extinct glyptodons (giant armadillo) and modern-day armadi...

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BIO 121 Chapter 6 Review Questions and Correct Answers

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Actin A globular protein that links into chains, two of which twist helically about each other, forming microfilaments (actin filaments) in muscle and other kinds of cells. Active transport The movement of a substance across a cell membrane, with an expenditure of energy, against its concentration ...

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UBC BIOL 121 Practice Questions and Correct Answers

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Gene pool all of the alleles of all the genes in a certain population Hardy-weinberg principle genotype frequencies in a large population do not change from generation to generation in the absence of evolutionary processes Claims of hardy-weinberg principle (1) if the frequencies of alleles a1 and...

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Biology 121 Final Exam Review Questions and Correct Answers

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Prokaryotes are classified as belonging to two different domains. What are the domains? Bacteria and Archaea Life is organized in a hierarchical fashion. Which of the following sequences correctly lists that hieracrchy from least inclusive to most inclusive? molecule, organelle, cell, tissue, organ...

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BIO 121 Unit 3 Exam Questions and Correct Answers

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What process is most directly driven by light energy? Removal of electrons from chlorophyll molecules True or False: plants require no more than energy and a carbon source to make their food False Which color has the greatest energy? Blue A pigment absorbs a photon only if the energy of the photo...

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Biology 121 Exam 1 Practice Questions and Correct Answers

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Metabolism the entirety of an organism's chemical reactions Metabolic pathway starts with starting molecule, reaction occurs with catalyst to create new molecule, happens more until end product is made Catabolic pathway releases energy by breaking down complex molecules into simpler compounds An...

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Biology 121 Unit 1 Exam Questions and Correct Answers

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Which is the correct sequence of increasing organization? "Molecule, cell, organelle, organ" "Organelle, tissue, cell, organ" "Atom, molecule, tissue, cell" "Organ, tissue, cell, molecule" "Cell, tissue, organ, organ system" Cell, tissue, organ, organ system Choose the correct pathwa...

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Biology 121-Chapter 4 Exam Review Questions and 100% Correct Answers

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One of the major functions of the plasma membrane is to control what enters and leaves a cell. Which of the following would directly supply energy to an active carrier protein? ATP Hikers can detect a dead skunk along a trail long before they actually see it. What process allows the scent of the s...

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BIO 121 Final Exam Questions and Solutions

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The cardiovascular reflexes are based in the medulla oblongata. The narrow passageways that contain cytoplasmic extensions of osteocytes are called canaliculi. The molecule H2 is known as hydrogen. The triplet codes needed to specify a specific protein are found in the gene. A cell with many mit...

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BIO 121 Exam 3 Review Questions and Complete Solutions

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Binary fission a method of asexual reproduction; "division in half"; involves mitosis in eukaryotes Mitosis a process of nuclear division in eukaryotes What are the 5 stages of Mitosis? 1. Prophase 2. Prometaphase 3. metaphase 4. anaphase 5. telophase Meiosis A modified type of cell division in...

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BIO 121 Exam 5 Study Questions and Correct Answers

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Which of the following are true concerning the Healthy People program? Select all that apply. A. Government sponsored program to improve the nation's health B. Reviews and updates the Nutrition Facts labels C. The program is updated every 10 years D. An objective and goal of the program is to encou...

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Biology 121 Test 1 Questions and Correct Answers

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When (roughly) did the first oxygen-producing bacteria evolve on earth? As long as 3.5 billion years ago and certainly by 2.7 billion years ago. How do scientists today measure the CO2 in the earth's atmosphere over the most recent million years or so? Ice-core data before 1958. Mauna Loa data aft...

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Biology 121 Chapter 4 Review Questions and Correct Answers

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Bacteria prokaryotes that are members of the domain Bacteria, one of the three domains of living organisms; only distantly related to members of the domain Archaea. Basal body a structure derived from a centriole that produces a cilium or flagellum and anchors this structure within the plasma membr...

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BIO 121 Chapter 3 Questions and 100% Correct Answers

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What is another name for a condensation reaction? dehydration What is the name of the process during which a bond between two monomers is broken? hydrolysis Carbohydrate polymers are made up of __________ monomers. simple sugar Protein polymers are made up of ________ monomers. amino acid Nuclei...

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Biology 121 Chapter 5 Test Questions and Correct Answers

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Functions of plasma membrane -separate 2 aqueous environments - regulate the passage of materials between the two aqueous environments - serve as the site for various biochemical functions - allow communication between cells - create attachments within and between cells Phospholipids responsible fo...

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Bio 121 Exam 3 Questions and Correct Answers

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Respiration Breakdown of fuel (food) molecules to release energy; ALL living organisms do this Photosynthesis Using sunlight energy and atmospheric CO2 to make food molecules; Autotrophs Photosynthesis equation Energy+ 6CO2+ 6H2O= C6H12O6+ 6O2; reverse of respiration; synthesizes carbohydrates Wh...

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BIO 121 Exam 6 Study Questions and Complete Solutions

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1. Formed by the end of week 8 2. Allows for the transfer of waste products 3. formed following a period of rapid cell division 4. Union of an egg and sperm 1. Fetus 2. Placenta 3. Embryo 4. Zygote Briefly explain why an infant would be considered preterm. An infant born prior to 37 weeks o...

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Bio 121 Unit 2 Exam Study Guide with Questions and Correct Answers

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What is a nucleosome made of? Eight histone proteins and two rounds of DNA double helix wrapping around those eight histone proteins What are the names of the histone proteins? H2a, H2b, H3, and H4 (two of each) What cells have a nucleosome? Eukaryotic cells What phase is interphase in? mitotic p...

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Exam 1, 2 & 3 Bio 121 Review Questions and Correct Answers

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A covalent chemical bond is one in which ... Outer - shell electrons of two atoms are shared to satisfactory fill the valence Difference between covalent bonds and ionic bonds Covalent bonds involve the sharing of bonds between atoms. Ionic bonds are electrical attraction - positively and negativel...

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BIO 121 Exam 1 Chapters 1-4 Review Questions and Correct Answers

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Environmental Science The scientific study of how the natural world works, how our environment affects us, and how we affect our environment Natural Resources the goods provided by the environment. Can be renewable or nonrenewable Ecosystem Services natural systems provided by the environment Eco...

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Bio 121 Exam 1 Questions and Complete Solutions

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Ecology is the study of the structure, function, and interactions among natural systems in the biosphere. Abiotic factors are non-living physical conditions such as weather, climate, geological characteristics and phenomena, and geographical structure. Biotic factors are those 'living' characteri...

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Bio 121 Exam 1 Questions and 100% Correct Answers

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What are the characteristics of life? organization, metabolism, responsiveness, growth, development, reproduction What are the levels of biological organization molecules-Organelles-cells-tissue-organs and organ systems-organisms-populations-communities-Ecosystems-The biosphere Biotic Vs. Abiotic ...

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Exam 1 Practice BIOL-121 Questions and Correct Answers

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Dye injected into a plant cell might be able to enter an adjacent cell through _________________. A. Plasmodesmata B. Tight Junctions C. Gap Junctions D. Desmosomes E. Magic A. Plasmodesmata Which of the following is NOT part of the endomembrane system? A. Golgi Apparatus B. Rough Endo...

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Biology 121 Study Guide with Questions and 100% Correct Answers

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7 characteristics of all living organisms 1.)Cellular organization 2.)Ordered complexity 3.)Sensitivity 4.)Growth, development, and reproduction 5.)Energy utilization 6.)Homeostasis 7.)Evolutionary adaptation Cellular Level Atoms, molecules, organelles, and cells. Cell is the Basic unit of life. O...

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Biology 121 Unit 2 Exam Questions and Correct Answers

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Selectively Permeable membrane allows the passage of some materials but not others Phospholipid Bilayer made up by the hydrophobic/philic "tails" and "heads" Functions of Membrane Proteins transport enzymes receptors recognition adhesion attachment to the cytoskeleton Diffusion the net moveme...

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