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1 namibia UniVERSITY OF SCIEnCE AnD TECHnOLOGY FACULTY OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES QUALIFICATION: BACHELOR OF SCIENCE (MAJOR AND MINOR) QUALIFICATION CODE: 07BOSC LEVEL: 5 COURSE: GENERAL BIOLOGY 1A DATE: JUNE 2016 DURATION: 3 Hours COURSE CODE: GNB501S SESSION: MARKS: 110 FIRST OPPORTUNITY EXAMINATION QUESTION PAPER EXAMINER(S) Dr. Jeya Kennedy MODERATOR: Mrs. Louise Theron INSTRUCTIONS 1. Write clearly and neatly 2. Number the answers clearly 3. All written work MUST be done in blue or black ink 4. No books, notes and other additional aids are allowed 5. Mark all answers clearly with their respective question numbers THIS QUESTION PAPER CONSISTS OF 7 PAGES (Including this front page) 1
2 QUESTION 1: MULTIPLE CHOICES QUESTIONS (10] 1.1 ATP; a) has a helical structure b) is a high-energy molecule that can break down to ADP and phosphate c) provides enzymes for metabolism d) is most energetic when in the ADP state 1.2 The fat-soluble vitamins include a) A b) D c) E d) All of the above 1.3 The NADPH and ATP from the light reactions are used to; a) split water b) cause RuBP carboxylase to fix C0 2 c) cause electrons to move along their pathways d) convert 3PGA to G 3 P 1.4 When a human red blood cell is placed in a hypotonic environment, it will; a) undergo cytolysis. b) undergo plasmolysis. c) experience a decrease in turgor pressure. d) be at equilibrium 1.5 The sodium-potassium pump transports; a) Na+ out ofthe cell and K+ into the cell. b) Na+ and K+ in both directions across c) K+ out of the cell and Na+ into the cell. d) Na+ during some cycles and K+ during other cycles 2
3 . ',. 1.6 To determine the genotype of an individual that shows the dominant phenotype, you would cross that individual with one that is; a) heterozygous dominant. b) heterozygous recessive. c) homozygous dominant. d) homozygous recessive. 1.7 Mendel obtained plants that were true-breeding for particular traits by; a) growing plants from the seeds of other plants that showed that trait. b) discarding plants that showed other traits. c) allowing plants to self-pollinate for several generations. d) allowing plants to cross-pollinate for one generation. 1.8 Oswald Avery and his colleagues showed that the transforming agent in Griffith's experiments was; a) RNA. {1) b) protein. c) DNA. d) an enzyme. 1.9 During translation, one end of a trna molecule pairs with a complementary; a) nucleotide sequence in DNA. b) mrna codon. c) trna molecule. d) protein molecule The percentage of adenine in DNA is; a) equal to the percentage of cytosine. b) equal to the percentage of thymine. c) not related to the percentage of thymine. d) equal to the percentage of guanine. 3
4 QUESTION 2: FILL IN THE BLANK 2.1 Protein chains are called 2.2 Saturated fatty acids are so named because they are saturated with 2.3 The science of classifying organisms is known as 2.4 Hershey and Chase radioactively tagged the viral DNA with (a) and the protein capsid with (b) 2.5 During interphase, the region of the chromosome where two chromatids are held together is called the 2.6 Protein in plasma membrane that bears a carbohydrate chain is known as; 2.7 The ETC occurs across the inner membrane of the (a) and produces _(b) as an end product. 2.8 especially active in lipid metabolism always produces H is the process in prophase I that forms tetrads Double ring nitrogen bases are called (a), while single ring nitrogen bases are called (b) QUESTION 3: ONE WORD ANSWERS 3.1 Which term is best describing the process of cell eating? 3.2 Under which kingdom are the unicellular eukaryotes grouped? 3.3 What is the use of hyphae in fungi? 3.4 What is disassembles in telophase of mitosis? 4
5 3.5 What was the purpose of Griffith's experiment 3, in which he injected a mouse with heat-killed S cells? 3.6 Who is the father of taxonomy? 3.7 Write a heterozygous genotype. 3.8 What is found inside lysosomes? 3.9 Which two organelles contain DNA? 3.10 What occurs after chromosomes condense in meiosis 1? QUESTION 4: DEFINE THE FOLLOWING TERMS [5] 4.1 Organelle- 4.2 Control group- 4.3 Lactic acid fermentation- 4.4 Helicase- 4.5 Transformation - QUESTION 5: DISTINGUISH BETWEEN THE TERMS IN EACH OF THE FOLLOWING PAIRS OF TERMS. 5.1 Ecosystem, Community- 5.2 Dependent variable, independent variable- 5.3 Cilia, flagella- 5
6 '. 5.4 Chromatid, centromere- 5.5 Hypertonic, plasmolysis- QUESTION 6: SHORT ANSWER [32] 6.1 What is a codon? Name the 3 stop codons. 6.2 Draw the structure of the glycerol. 6.3 In general which phase of the cell cycle has a longer phase and which has a shorter duration? 6.4 List the key differences between meiosis I and II. 6.5 State the four parts of the cell theory. {3) 6.6 A chicken has 78 chromosomes in its somatic cells. (a)how many chromosomes did the chicken inherit from each parent? (b)how many chromosomes are in each of the chicken's gametes? (c)how many chromosomes will be in each somatic cell of the chicken's offspring? (3) 6.7 Describe three ways that RNA differs from DNA. {3) 6.8 If 15% of the nucleotides in a DNA molecule contain guanine, what percentage of the nucleotides contains each of the other three bases? Explain your reasoning. (3) 6.9 Name the steps involved in the scientific method. (4) 6.10 Contrast cytokinesis in animal cells and plant cells. (4) 6.11 (a) Who created the first compound microscope? (b)what is the use of microscope? (c) Name the person who viewed living organism in pond water with small lenses? (d)who was the first person to examine a piece of cork using a microscope? (4) 6
7 ' " I I ' I, QUESTION 7: ANSWER THE QUESTIONS 7.1 Add up the energy captured in each stage of aerobic respiration. (5) 7.2 Give the functions of these organelles: (5) (a) endoplasmic reticulum (b) Golgi bodies (c) Nucleolus (d) Lysosomes (e) Ribosomes QUESTIONS 8: [8] ANSWER ONLY ONE QUESTIONS FROM THE SECTION BELOW 8.1 List the main characteristics of living things and write the levels of organization (living & nonliving) in order beginning with the atom. (8) OR 8.2 Explain Frederick Griffith's experiment on mouse. (8) QUESTIONS 9: EASSY QUESTIONS [15] ANSWER ONLY ONE QUESTIONS FROM THE SECTION BELOW 9.1 Describe the three phases of the Calvin cycle and indicate the role of ATP and NADPH in the process. (15) OR 9.2 Distinguish between monosaccharides, disaccharides, and polysaccharides and compare storage polysaccharides with structural polysaccharide. (15) THE END 7
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