ISB 202 Exam 3 Review Questions

ISB 202 Exam 3 Review Questions - ISB 202 Exam 3 Study...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
ISB 202 Exam 3 Study Questions Fall Semester 2008 1. Do viruses fit the definition of a living organism? “non-cellular, non-living infectious particle” 1. Has the following parts: a) Nucleic acid (either DNA or RNA ) -- single or double strand of either (not both) b) usually coated with protein (may be “naked”) c) may be surrounded by an envelope 2. Can a virus replicate by itself? 2. It can NOT replicate by itself!!!! -- it must get a host cell to do it. Fortunately for us – it requires a specific type of cell found only in certain species. 3. What protease (protein that is an enzyme) is absent or found in only small amounts with many people who have cancer? P53 4. What is a benign tumor? Benign tumor-uncontrolled growth with no obvious adverse effects 5. Are oncogenes “good?” Why or why not? oncogenes = genes that promote undirected cell division and aren’t turned off 6. What does the term “metastasized” mean? Metastasized-it’s spreading 7. About 90% of all lung cancer is preventable. True or False 8. What does the term “carcinogen” mean? Carcinogens-any substance that triggers cancer 9. What is the most common form of cancer in humans in the U.S.? 1 in 7 will get skin cancer most common cancer 10. What can cause diseases AND also cancer? (Is it an organism?) viruses, no 11. Ultraviolet light can cause skin cancer by damaging the cells’ DNA. What change occurs? Denatures proteins- Damages DNA by causing adjacent base pairs of thymine to bond to each other instead of the opposite bases on the SNA strand in the double helix 12. What are three ways carcinogens get into humans? 1. Inhaled 2. Absorbed (through the skin) 3. Ingested (eaten) 13. What kind of cancer is very common in men, but never occurs in women? Prostate 14. Can men get breast cancer? No 15. Smoking is responsible for about 30% of all cancers in the U.S. TRUE!! 16. Carcinogens are found in tiny amounts all around us, including many of our food. T or F 17. A fast-growing “mole” on your skin should be checked out immediately, especially if it shows what four characteristics (ABCD)? A = asymmetrical? (uneven thickness) B = border irregular? C = color uneven? D = diameter > 1/4 inch? (~ 6mm) 18. Bacteria are the oldest organisms on Earth. Did the archae or the eubacteria likely gave rise to protistans, fungi, animals and plants? archae “bacteria” likely created our oxygen 19. About how fast (on average) do bacteria divide? This takes only about 20 minutes 20. If they divide so fast, why don’t they take over the world? (What limits them?) a) run out of resources and die b) their own wastes change their environment (less livable) c) some viruses kill them
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
d) many fungi kill them 21. Can fungi kill bacteria? Can bacteria kill fungi? – fungi and bacteria have battled for millenia!! 22. When told to take an antibiotic for 10 days, why is it foolish to stop after only 5 days when you feel
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

ISB 202 Exam 3 Review Questions - ISB 202 Exam 3 Study...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online