Life120 Unit 1 Notes (Chapter 1-4)
Life120 Unit 1 Notes (Chapter 1-4) LIFE 120
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This 49 page Class Notes was uploaded by mkennedy24 on Wednesday September 14, 2016. The Class Notes belongs to LIFE 120 at University of Nebraska Lincoln taught by Dr. Brian Couch in Fall 2016. Since its upload, it has received 351 views. For similar materials see Fundamentals of Biology I in Biology at University of Nebraska Lincoln.
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Date Created: 09/14/16
Biology LIFE120 Chpt: 1-4 Sep 15, 2016, 12:55 AM Which of the following are true regarding the DNA present in human organisms? (Select all) a. DNA is inherited from one's biological parents b. DNA is present only in reproductive cells c. Cells in two different tissues can contain identical DNA sequences d. DNA mutations are always harmful to an organism Answer: A,C Each branch point represents the common ancestor of particular evolutionary lineages OBJECTIVES: • Deﬁne the different levels of biological organization, provide examples of entities found at each level and be able to place the levels in order from largest to smallest • Evaluate how core concepts are present within different biological scenarios • Deﬁne general features of cell structure, function, and classiﬁcation • Describe how the information present in DNA is expressed within a cell • Evaluate different places of evidence indicating that life derives from common ancestry • Describe condition that are necessary in order for natural selection to occur • Explain how natural selection can lead to two different populations with features that are uniquely adapted to their particular environment What element apes up the abundance of the molecular human body weight? a. Carbon b. Hydrogen c. Nitrogen d. Oxygen Answer: Oxygen; the body is mostly made up of water and water is a molecule made up of 2 hydrogen atoms and 1 oxygen atom. Now that would seem like hydrogen makes up the most since in the molecule there are twice as many hydrogen atoms than oxygen, but the atomic weight of hydrogen is 1.008amu and oxygen is 16.01amu, therefore meaning oxygen makes up the abundance of the molecular body weight Which graph represents the decay of Carbon-14 after an organism has died? Answer: B, every 5000 years, Carbon-14 decays more What is the best electron conﬁguration for a molecule of oxygen (Atomic number for oxygen= 8) Answer: A; ﬁrst draw electron conﬁguration, knowing the atomic number is 8 we know there are 8 electrons. To ﬁll the sub shells, we know the ﬁrst subs hell can only have 2 electrons so we have 6 left which are the outermost electrons or valence electrons. Which of the following describes hydrogen ﬂuoride (H-F)? Electronegativity H: 2.1, F: 4.0 a. H and F have a large difference in Electronegativity b. H and F are joined by a polar covalent bond c. H attracts the shared electrons more strongly than F d. H has a partial positive charge Answers: A,B,D How many unique sequences can be made within a segment of DNA that is 10 nucleotides long? a. 10 different sequence b. 10x4=40 different sequences c. 10000 different sequences d. 1048576 different sequences Answer: D Which of the following describes the physical properties of saturated fats when compared to unsaturated fats? Saturated fats: (select all) a. Packs more tightly b. Are more likely to be solid at room temperature c. Represent a more dense form of energy storage d. Are more likely to b found in plants Answer: ABC OBJECTIVES: • Predict how water molecules will orient themselves to dissolve a charged substance, such as salt • Predict whether a substance will readily dissolve in water based on it chemical properties • Describe how detergents enable hydrophobic substances to be dissolved in water • Describe how the concentration of hydrogen ions is related to the pH of a solution • Deﬁne acids and bases in terms of their hydrogen ion concentrations and where they fall on the pH scale Clicker Question A. 10 different sequences B. 10 x 4 = 40 different sequences C. 10x10x10x10= 10,000 different sequences D. 4^10= 1,048,576 different sequences Answer is D Clicker Question: Which of the following describes the physical properties of saturated fats when compared to unsaturated fats? Saturated fats: (select all) A. Pack more tightly B. Are more likely to be solid at room temperature C. Represent a more dense form of energy storage D. Are more likely to be found in plants Answer is ABC Clicker Question: the active hemoglobin protein shown below is comprised of four separate polypeptides. Which of the following is affected when this protein becomes fully denatured or unfolded? (select all) A. Primary structure B. Secondary structure C. Tertiary structure D. Quaternary structure Answer: BCD Clicker Question: Which one of the following is complementary to the below strand? 5' - AGT CGA - 3' A. 5' - TAC GCT - 3' B. 5' - AGC GTA - 3' C. 5' - TCG CAT - 3' D. 5' - ATG CGA - 3' Answer: C the answer must be opposite in movement (3' and 5') and also match each letter with its compliment. General composition of animal cells General composition of plant cells Clicker Question: what is the main reason why some proteins are synthesized in the cytosol whereas others are synthesized into the rough ER? A. Folded proteins are unable to readily cross cell membranes B. The rough ER is continuous with the nuclear membrane C. There is a lot of surface area on the rough ER for protein synthesis D. Ribosomes on the rough ER are structurally different than free ribosomes Answer: A Clicker Question: A protein is synthesized into the rough ER. Which of the following places would this protein be able to go into the cell? A. Attached to ribosomes B. Throughout cytosol C. Within the nucleus D. Inside the Golgi apparatus Answer: D Transport through the endomembrane system occurs via budding and fusion events