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BIOL 103-7380 FINAL EXAM University of Maryland University College The following general directions apply to this exam: This exam is worth a total of...

I need assistance on questions 51-57 on my Biology final exam.

BIOL 103-7380 FINAL EXAM University of Maryland University College The following general directions apply to this exam: This exam is worth a total of 100 points . Multiple choice questions #1-45 are worth 1 point each. Multiple choice questions #46-50 are worth 2 points each. Choose 5 of 7 essay questions #51-57, which are worth 9 points each. Please provide answers on the answer sheets provided at the end of the exam. I recommend that you print out the exam, answer the questions, then copy the answers onto the answer sheets. Please submit only the answer sheets into your assignment folder by 11:59 PM Eastern Standard Time Sunday 17 April. As in all assignments, I trust that your answers are your own work. GOOD LUCK! Thanks for taking the course, D Riege ********************************************************************** MULTIPLE CHOICE QUESTIONS – 1 POINT EACH – 45 POINTS TOTAL: On the answer sheet, indicate the letter that represents the best answer to each of the multiple choice questions below. 1. Which of the following includes all the others? A) atom B) cell C) organism D) population 2. In science, a hypothesis must be A) testable B) derived from a theory C) a known fact D) able to be proven absolutely true 3. A chlorine atom has 17 protons, 18 neutrons, and 17 electrons. The atomic number of chlorine is A) 8 B) 17 C) 35 D) 52 4. If you place the probe of a pH meter in lye or sodium hydroxide (NaOH), it will read pH 14. Sodium hydroxide is A) an acid B) neutral C) a base 5. This polysaccharide forms fibers that are a major component of plant cell walls: A) glucose B) starch C) cellulose D) glycogen 6. Which of these types of molecules contain nitrogen? A) polysaccharides B) proteins C) steroids 7. Fats contain more energy per gram than carbohydrates or proteins because A) fat molecules contain a lower percentage of oxygen atoms B) fat molecules contain a lower percentage of hydrogen atoms C) fat molecules contain a lower percentage of carbon atoms D) fat molecules contain a higher percentage of adipose atoms 8. Prokaryotic cells, with no nucleus or membranous organelles, are found in A) animals B) bacteria C) fungi D) plants 9. The main function of a ribosome is to A) extract energy from glucose B) synthesize glucose C) store food in the form of fat D) synthesize proteins
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10. Mitochondria A) package proteins for secretion from cell B) contain chromosomes C) are sites of oxidation of glucose to generate ATP D) synthesize proteins 11. The plasma membrane consists of A) a single layer of phospholipid molecules B) a double layer of phospholipid molecules in which proteins are embedded C) several layers of protein and carbohydrate molecules D) a triple layer of phospholipids and carbohydrates 12. The movement of molecules from a region of low concentration across a membrane to a region of high concentration by use of ATP energy is A) active transport B) diffusion C) passive transport D) osmosis 13. The oxygen in our atmosphere is produced by A) greenhouse effect B) cellular respiration C) photosynthesis D) volcanic eruptions 14. Yeast cells break down glucose anaerobically into A) ethanol and CO 2 B) lactic acid and CO 2 C) lactic acid and H 2 O D) ethanol and H 2 O 15. Carbon dioxide is released in A) the light-dependent phase of photosynthesis B) the Krebs cycle C) glycolysis D) the Calvin cycle 16. If the concentration of glucose in the water outside of a cell is lower than the concentration inside, A) water will tend to enter the cell by osmosis B) water will tend to leave the cell by osmosis C) glucose will tend to enter the cell by osmosis D) glucose will tend to leave the cell by osmosis 17. What happens if a red blood cell is placed in a hypertonic solution? A) the cell will shrink B) the cell will swell and may burst C) the cell will remain the same size 18. Which of the following is not a characteristic of enzymes? A) they are proteins B) they speed up the rate of chemical reactions C) they act on specific substances called substrates D) they are used up in each reaction, thus need to be produced in large quantities 19. Which of these does not have to be present for photosynthesis to occur? A) water B) carbon dioxide C) glucose D) chlorophyll 20. Each new cell produced by this process will have an identical copy of all chromosomes and genes possessed by the parent cell: A) mitosis B) meiosis 21. During the first division of meiosis, A) chromosomes separate at the centromere B) homologous chromosomes separate C) chromosomes become triploid 22. If a normal parent and an albino parent have albino child, the genotypes of the parents are A) AA x Aa B) Aa x Aa C) Aa x aa D) aa x aa
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51. Describe three structures found in plant cells but not animal cells. Describe the function of
each structure, and how each benefits plant cells but is not necessary for animal cells.

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