题目内容

以下程序运行后的输出结果是__________。#includeint main(){int a=1,b=2,c=3,d=0;if(a==1)if(b!=2)if(c==3)d=1;else d=2;else if(c!=3)d=3;else d=4;else d=5;printf("%d\n",d);return 0;}

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以下程序运行后的输出结果是______________。#includeint main(){int x=1,y=0,a=0,b=0;switch(x){case 1:switch(y){case 0:a++;break;case 1:b++;break;}case 2:a++;b++;break;case 3:a++;b++;}printf("a=%d,b=%d\n",a,b);return 0;}}

Regarding HIV which of the following is not true

A. It is a DNA retrovirus
B. Contains reverse transcriptase
C. May infect host CD4+ cells other than T-lymphocytes
D. Causes a reduction in host CD4+ cells at late stage of disease

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HIV can be detected and confirmed by

A. Polymerase chain reaction (PCR)
B. Reverse transcriptase - PCR
C. Real time PCR
D. Mimic PCR

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HIV-1 encodes an envelope glycoprotein, gp120. This protein

A. Causes membrane fusion
Binds to the viral coreceptor on the cell surface
C. Is highly conserved among different isolates
D. Fails to elicit neutralizing antibody
E. Induces chemokine production

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