BIOL 111 SECTION 544 555Instructor Dr Xie Name U I N Exam 2Form A October 24 2024 INSTRUCTIONS 1 Sign your name in the space marked SIGNATURE at the bottom of this page NOTE Enter your name and U I N at the top of this pageBecause these forms are computer graded it is extremely important that the following information iscorrect Please check your responses 2 Print your First and Last name NEATLY on the Name box at the top left of the bubble sheet 3 Print your UIN Universal Identification Number in the ID box 9 digit number on your student ID 5 Enter the Section Date and Exam in the corresponding boxes of the bubble sheet6 Sign the bubble sheet in the box labeled Aggie Honor Code Signature 7 Bubble in your answers to the corresponding number row on the bubble sheet Bubble your answerin as fully and neatly as possible 8 Please check that you have 40 questions ALWAYS CHOOSE THE BEST ANSWER AAn Aggie does not lie cheat or steal or tolerate those who do On my honor as an Aggie I have neither given nor received unauthorized aid on thisacademic work Your Signature2023 Texas A M University Biology Department Unauthorized use of this material is aviolation of federal law 1 Exam 2Name MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers the question 1 In the polymerization of DNA a phosphodiester bond is formed between the of thenucleotide being added and the of the last nucleotide in the polymer 1 A cytosine guanineB 3 phosphate 5 OHC 5 phosphate 3 OHD adenine thymine2 Suppose you are provided with an actively dividing culture of E coli bacteria to which radioactivethymine has been added What would happen if a cell replicated once in the presence of thisradioactive base 2 A Neither of the two daughter cells would be radioactive B One of the daughter cells but not the other would have radioactive DNA C Radioactive thymine would pair with nonradioactive guanine D DNA in both daughter cells would be radioactive E All four bases of the DNA would be radioactive 3 During DNA replication how many primers are needed for synthesis of the leading strand and thelagging strand 3 A Multiple primers for both strands B Only one primer for each strand C Multiple primers for the leading strand only one primers for the lagging strand D No primers are needed for DNA replication E Only one primer for the leading strand multiple primers for the lagging strand 4 Which enzyme catalyzes the elongation of a DNA strand in the 5 cid 15 3 direction 4 A helicaseB primaseC DNA ligaseD topoisomeraseE DNA polymerase III5 Which property below is characteristic of an integral membrane protein 5 A It is entirely hydrophobic B It is amphipathic containing both hydrophobic and hydrophilic regions C It is exposed on only one surface of the membrane D It is entirely hydrophilic E It is completely covered with phospholipids 2 Exam 2Name 6 The figure below illustrates a replication bubble with replication forks The arrows indicate theoverall directions of replication Which numbered strand represents one of the leading strands ofthe newly synthesized DNA 6 A 2B 5C 1D 3E 47 Insulin is a protein hormone that cannot pass through the cell membrane by simple diffusion Which of the following structures or mechanisms could help transport insulin into a cell 7 A OsmosisB Facilitated passive transportC Receptor mediated endocytosisD Proton pumpE Aquaporin8 PDGF platelet derived growth factor is a molecule released by platelets in the vicinity of aninjury PDGF is an example of 8 A A digestive enzyme released during wound healing B An antibody that helps fight infection C A structural protein that forms the extracellular matrix D A signaling molecule that promotes cell division A cell uses an ATP driven proton H pump to remove protons from the cell against their gradient Next to these pumpscan be found a transmembrane protein that cotransports H and the amino acid glutamate into the cell Use the information given above to answer the following question 9 Which statement is true regarding the proton pump 9 A This is a form of secondary active transport B The proton pump allows for pinocytosis of H C The H pump is a carrier protein for simple diffusion D This is a form of primary active transport E The H pump is not necessary to move protons across the cell membrane 3 Exam 2Name 10 In a DNA molecule guanine makes up 30 of the nucleotides According to Chargaff s rule whatpercentage of the nucleotides in this DNA molecule will be adenine 10 A 60 B 8 C 15 D 20 E It cannot be determined from the information provided 11 S phase is associated with which of the following cellular events 11 A breakdown of the nuclear membraneB the beginning of mitosisC normal growth and cell functionD DNA replication12 An animal cell lacking carbohydrates on the external surface of its plasma membrane would likelybe impaired in which function 12 A cell cell recognitionB establishing a diffusion barrier to charged moleculesC transporting ions against an electrochemical gradientD attaching the plasma membrane to the cytoskeleton13 In experiments tracking genetic material scientists often use radioactive phosphorus 32 32P tolabel DNA Why wouldn t radioactive nitrogen such as nitrogen 13 be effective for labelingDNA 13 A There is no radioactive isotope of nitrogen B Amino acids and nucleotides both contain nitrogen thus the radioactivity would notdistinguish between DNA and proteins C Radioactive nitrogen has a half life of 100 000 years and the material would be toodangerous for too long D Phosphates are more radioactive than radioactive nitrogen 14 A diploid cell has 2n 40 chromosomes Which of the following statements is true 14 A This cell has 20 homologous pairs of chromosomes B The species is diploid with 80 chromosomes per cell C There will be 80 separate chromosomes during the S phase of this cell D A gamete from this species has 10 chromosomes E The species has 40 sets of chromosomes per cell 15 The M phase checkpoint ensures that all chromosomes are attached to the mitotic spindle If thisdoes not occur the likely result is 15 A Unequal chromosome numbers in the daughter cells B Failure of the nucleus to reform C Failure of the mitotic spindle to retract correctly D Unpacking of the chromosome to chromatin 16 Increasing the proportion of unsaturated phospholipids in a membrane can 16 A Greatly increase the proportion of saturated fatty acids in the membrane as well B Increase the permeability of the membrane and make the
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