Question;EXAM 4 Fall 2010 FORMA;1. Which form of the exam do you have?;A. Form A;B. Form B;2. The HIV virus that causes AIDS;specifically attacks and kills helper T cells. This weakens theimmune system because helper T cells;A.;directly destroy cells infected with HIV;B.;roam the body looking for;invaders;C.;turn on (activates) the antibody mediated;and the cell-mediated defense systems in thebody.;D.;produce antibodies;E.;turn off the immune response;3. Choose the INCORRECT statement.;A.;The antibody-mediated immune response is di;rected at antigens that are outside ofcells, free in;body fluids.;B.The cell-mediated immune response plays a role in the rejection of organ;transplants;C.A macrophage presents the antigen to the appropriate helper T cell.;D.Antibodies are effective against viruses that have inserted their;genetic material intothe host cell chromosome.;E.;Suppressor T cells shut down the immune response;after the "invader" (antigen) hasbeen;eliminated from the body.;4. Which part;of a vi rus comes f rom a previous host cell? The;A.;genetic information;B. the;protein coat (capsid);C.;the envelope;D.none of the above;5. Indicate the choice that contai ns onlyCORRECTstatements.Statements;1.;Antibodies are specific to one particular;antigen.;2.;Antibodies are held within the cel I that;produces them.;3.;Antibodies may inactivate (neutralize) a toxi;n produced by a bacterium.;4.;Antibodies are produced by macrophages.;5.;Antibodies can only be effective against;antigens that are free in the bloodstream (notwithin cells).;Choices;A.1, 2, 3;B.2, 3, 4;C.3, 4, 5;D.1, 3, 5;E.1, 3, 4;6. The immune system helps protect us against cancer because___________attack and kill;cancerous;cells that develop.;A.;helper T cells;B.B cells;C.;cytotoxic T cells;D.all of the above;7. How do;viruses gain entry to a host cell?;A.;by binding to a receptor site on the host;cell;B.;by binding to an antibody site on the host;cells;C.;by dissolving a piece of the host cell;membrane;D.;all of the;above;8. Choose the;INCORRECT STATEMENTabout cervical cancer;A.;The human papi I I oma virus (H PV) is;thought to be an important cause of cervicalcancer;B.;A woman's risk of getting cervical cancer generally;increases with the number of(male) sexual partners she has had.;C.;A woman's risk of getting cervical cancer is lowered;if she and her partner(s)consistently use a barrier means of;contraception, such as a condom or diaphragm.;D.;It can increase a woman's risk of having an ectopicpregnancy.;E.;It can be detected with a Pap test.;9. Your;brother confides in you that he has painful, fluid-filled blister-like sores on;his penis. Which of the fol I owi ng is most likely to be the cause?;A.;syphilis;B.;gonorrhea;C.;chl amydi a;D.;genital warts;E.;genital herpes;10. Jennifer is a 28 year-old woman who is having difficulty getting;pregnant. After many testsit is determined that the reason for this;problem is that she has scar tissue blocking her oviducts(fallopian tubes). The STD that ismost likelyto have caused this is.;A.;syphilis;B.;gonorrhea;C.;chl amydi a;D.;genital herpes;E.;genital warts;11.Which of the;following directly activates both the cell-mediated immune response and theantibody-mediated immune;response?;A.;memory B cells;B.;helper T cells;C.;plasma cells;D.;cytotoxic T cells;E.;suppressor T cells;12. An antigen is a;A.;cell that produces antibodies;B.;receptor on the surface of a lymphocyte that recognizes invaders;C.;memory cell that causes a quick response to an;invader when it is encountered asecond time;D.;a large molecule on the surface of an invader that;triggers an immune response;E. none of the above;13. Your friend Joe has;been dating Claudia and they have been sexually active for three months.Joe had never been;sexually active before he met Claudia. Joe confides in you that he has noticed;a wart forming on his penis. He has asked Claudia whether she has genital;warts. She said, "No.I've definitely never seen anything remotely;resembling a wart on my body." He asks you where they could have come;from. You correctly respond.;A.;You probably got warts from using the dirty urinal;in the men's room of the gas stationwhere you work.;B.;The organism that causes warts is so common that;you could have gotten it anywhere.;C.;Claudia is obviously lying. She would have seen a wart.;D.;In women warts often form within the vagina or on;the cervix, and so Claudia may notrealize that she has;genital warts.;E.;none of the above;14. How does the virus;make new genetic information and proteins?;A.;It combines with the host;cell DNA.;B.;It never does reproduce, it only grows larger.;C.;It uses the host cell;structures.;D.;Once inside the host cell it is able to reproduce;sexually.;15. Your immune system;does not usually attack cells belonging in your body because;A.;suppressor T cells prevent the attack;B.;the antigens on your body cells block the attack;C.;antibodies paralyze helper T cells;D.;memory cells identify and protect body cells;E.;your own body cells have molecules on their surfaces;that identify them as belongingin the body;16. In which choice are all the STDs usually curable with an;antibiotic?;A.;herpes, chl amydi a, gonorrhea;B.;chlamydi a, syphilis, genital warts;C.;ch I amydi a, herpes, syphi I is;D.;genital warts, gonorrhea, syphilis;E.;chlamydi a, gonorrhea, syphi I i s;17. Below you;will find a series of steps in the triggering of the immune response. Indicate;the choice that places the steps i n the CORRECT order.;Steps;a a virgin;(cytotoxic) T cell is activated;b.;a macrophage encounters an "invader;(something that is not recognized as belongingin the body);c. a helper T cell is activated;d.a suppressor T cell becomes active;e. a cytotoxic T cell destroys the invading cell;Choices;A.;a, b, c, d, e;B.;b, c, a, e, d;C.;d, b, a,C,e;D.;b, a, c, d, e;E.;c, a, c, e, d;18. Choose theINCORRECTstatement;A.;If the bacteria that cause chl amydi a are;transferred to the eyes, it can cause blindness.;B.;Gonorrhea, chlamydi a, and syphilis can be;cured with antibiotics.;C.;Most women with chl amydi a have no;symptoms.;D.;A man with gonorrhea must ejaculate in;order to spread the infectious organism to apartner.;E.;HPV,which causes;genital warts, can spread over the entire anal genital area.;19. Which of;the fol I owi ng STDs is INCORRECTLY paired with a means of diagnosis that canbe usedat some point in the progression of the;disease?;A.;syphilis -- blood test;B.;gonorrhea -- blood test;C.;chl amydi a -- urine test;D.;chlamydia -- smear of cel Is from infected;area;E.;herpes -- blood test;20. Your cousin Masoud needs a kidney transplant. The doctors explain;that if the tissue type ofthe donor kidney doesn't match Masoud's tissue;type, that the_________________________of the immune system would attack and kill the donor;kidney, causing the organ to be rejected.;A.;B cells;B.;plasma cells;C.;antibodies;D.;effector cytotoxic T cells;E.;helper T cells;21.Therefore, to reduce the;possibility of organ rejection, the doctors test all of Masoud's closerelatives to see whether they would be suitable donors. The doctors are;looking for a relative;A.;whose tissues have similar "self' markers (MHC;markers) to those on Masoud's cells.;B. who lacks antibodies to Masoud's tissues;C. who has suppressor T cel Is that will suppress the immune response;against the donorkidney;D. lacks macrophages;E.;all of the above;22. Choose theINCORRECTstatement;A.;Genital warts can take months to appear.;B.;The same virus that causes cold sores can;be transmitted to the genital area of anotherperson;through oral sex.;C.;Herpescan only be spread when there are symptoms.;23. Damage to nerve tissue such as the optic nerve and brain occur;during which stage ofsyphilis?;A.;first;B.;second;C.;third;D.;it never occurs in syphilis;24. Choose theINCORRECTstatement.;A.;A virus infects only a particular type of;host cell. This specificity occurs because thevirus genetic;material must be compatible with the host cell genetic material for the vi ral;geneticmaterial to be inserted into the host cell;chromosome.;B.;Viruses can be shed without causing disease;symptoms.;C.;Many virusescan enter a latent stage;during which they don't cause diseasesymptoms.;During the latent stage the viral genetic material has been inserted into the;host cellchromosome.;D.;Some vi ruses;cause cancer.;25. Choose the;INCORRECT statement;A.;Chlamydia can lead to sterility in either;sex.;B.;HPVcan cause;pelvic inflammatory disease.;C.;Cold sores are caused by a herpes virus.;D.;The bacterium that causes syphilis can;cross the placenta and infect a fetusgrowing inthe uterus if;the mother has syphilis;26. Which;statement about genital warts is INCORRECT?;A.;The warts grow faster i n a woman who is;using a contraceptive containingprogesterone.;B.;You are not contagious until the warts appear;C.;The warts may take weeks to months to appear;D.;The warts are extremely contagious;E.;The warts are caused by a virus;27.What is the;purpose of the antigen that is displayed on the surface of a macrophage?;A.;It indicates that the "invader" has been;captured and the immune response can be shutdown.;B.;It secretes;antibodies.;C.;It fits in a receptor on the "invader;and neutralizes it (prevents it from making yousick).;D. It identifies the target that the immune response should be directed;against.;E.;It causes the target to burst.;28. When bacteria infect an animal, the;number of bacteria in the body increases gradual I y. Agraph of the growth of a bacterial population is a smoothly increasing;curve as shown in graph 1.A viral infection shows a different pattern.;For awhile there is no evidence of infection, and thenthere is a sudden increase in the number of vi ruses. The number stays;constant for a time, thenthere is another sudden i ncrease. The curve;of vi ral population growth looks I i ke a series of;steps, as shown in graph b. Which of the;following correctly explains the difference in thepatterns of growth of bacteria and vi ruses?;(a)'LYE: ?;Rantoria;(b)Time;Iil;Virus;A.;Viruses need to rest between division cycles;but bacteria do not need rest.;B.;Bacteria divide continuously with each cell;producing two new cells. Viruses replicatewithin a cell;and hundreds or thousands can be released at once.;C.;The food supply to fuel division for;bacteria is always available. The food supply forvi ruses is onl y avai I abl e duri ng I i mited times, and these are;the ti mes when vi ruses replicate.;D.;None of the;above.;29. When you move into the dorms, you learn that there is a girl on the;floor who has a herpes infection in her throat. Others on the floor are afraid;that they might catch herpes from using thetoilet seat if;she has used it before them. You correctly explain;A.;You might, but it would be oral herpes (a;fever blister), like she has, and 80% ofAmericans have;that.;B.You might. You better watch to see if she was in there before you.;C.Even if you do get it;you'll have obvious symptoms, and it is easily cured with anantibiotic.;D.The only way that could happen is if she licked the toilet seat when;she was sheddingviruses, placing viruses on the toilet seat.;Of course, you would also have to sit on the seatimmediately afterward;30.The reason;that you usually only get chickenpox once i s that;A.;Antibodies remain forever and immediately;neutral ize the chickenpox virus if youare ever;exposed to it again.;B.;Suppressor T cells form that immediately;suppress the infection if you are everexposed to;the vi rus again;C.;Chickenpox antigens are only effective once.;D.;Macrophages can no longer recognize the;chickenpox virus as an invader.;E.;Memory B cells and memory T cells formed;that mount an immune response veryquickly if;you are ever exposed to the virus again.;I SINCERELY HOPE THAT SOMETHING YOU LEARNED IN THIS CLASS WILL HELPYOU TO LEAD A HAPPIER, HEALTHIER LIFE.
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