Biology Standard level PaPer 1 Monday 17 November 2008 (afternoon) 45 minutes INSTRUCTIONS TO CANDIDATES • • •
Do not open this examination paper until instructed to do so. Answer all the questions. For each question, choose the answer you consider to be the best and indicate your choice on the answer sheet provided.
13 pages © International Baccalaureate Organization 2008
–– 1. Which of the following characterizes tissues? A. B. C. D. A group of cells that develop independently. A group of organs that have the same function. A group of cells that have the same function. A group of organs that have the same structure.
Which of the following explains how brain cells develop to carry out their functions? A. B. C. D. The cells have interacted to become brain cells. The cells have evolved that way. Some genes are expressed while other genes are not. All genes are expressed in the brain cells.
The following is a diagram of a prokaryote. I. II. III. IV.
Which two structures are required for protein synthesis in this cell? A. B. C. D. 8808-6004
III and IV II and IV II and III I and II
–– 4. What is necessary for osmosis to occur? A. B. C. D. A membrane protein A partially permeable membrane A source of energy A cell wall
In a cell the nuclear membrane has broken down and spindle microtubules from both poles are attached to each centromere of chromosomes aligned on the equator. Which phase of mitosis does this describe? A. B. C. D. Prophase Anaphase Metaphase Telophase
Which of the following contain the element phosphorus? A. B. C. D. Amino acids Viruses Ribose Deoxyribose
–4– 7. Which diagram correctly illustrates a glucose molecule? A. H C OH CHOH C H OH C H C. H N H C H
B. O H C OH
O C H N H C H C OH
CHOH C H H C OH
H H C OH C OH
H C OH
D. CH (CH)n C
The following diagram shows the effect of temperature on enzyme activity. What explains the lack of activity at high temperatures? Rate of enzyme activity optimum temperature
Temperature / °C A. B. C.
The active site no longer has the required shape. All the substrate has been used. All the enzyme has been used. The
Which of the following correctly show the process and location for pyruvate formation? Process A. B. C. D. aerobic cell respiration respiration photosynthesis photosynthesis Location cytoplasm chloroplast cytoplasm chloroplast
A molecule has two guanines, one cytosine, three riboses and three phosphates arranged in a single strand. What kind of molecule is this? A. B. C. D. DNA RNA A triplet of DNA nucleotides A polysaccharide
In photosynthesis, light energy is used to split water molecules. Which products are formed and what is the name of the reaction? Products formed A. B. C. D. hydrogen and ATP hydrogen and oxygen hydrogen and ATP hydrogen and oxygen Reaction photolysis photolysis hydrolysis hydrolysis
–6– 12. What can be concluded from the following data?
Karyotype of a male with a normal set of chromosomes DNA
chromosomes Karyotype of a male with Down syndrome
The genotypes of two parents are HbA HbA and HbA HbS. What are the likely phenotypes of their children? A. B. C. D. 7 % healthy 0 % may develop sickle-cell anemia % may develop sickle-cell anemia 100 % healthy
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