Florida International University

PCB evolution

Chapter 2

1)Humans will be evolving as a result of the HIV pandemic when ...

1. they are all vaccinated against the virus.
2. they realize about the magnitude of the pandemic.
3. their survival depends on heritable genetic characteristics.
4. the HIV virus disappear.

2. The HIV protein that is involved in attachment of the virus to host cells is ...

1. CD4
2. reverse transcriptase.
3. CCR-5
4. gp120.

3. What is the result when helper T cells fall below about 200 cells per cubic milliliter of blood?

1. HIV begins infecting other cells.
2. Acute phase of HIV infection.
3. Immediate death.
4. Inability to defend the body against opportunistic infections as well as the onset of AIDS.

4. The HIV virus was first recognized in ... a) 1983

b) 1985

c) 1981

d) 1993

5. Why does evolution matters?

1. It matters because the church denies it.
2. Because it recapitulates the ontogeny.

3. Because is a widely recognized hypothesis.
4. Because it addresses matters of life and death.

6. What is the major reason preventing the development of an efficient AIDS vaccine?

1. The susceptibility of the virus to AZT
2. The side effects in patients infected with the virus.
3. The lack of genetic material in HIV.
4. The high mutation rate of HIV.

7. The HIV enzyme that makes a double-stranded DNA copy of the viral genome is ...

1. RNA polymerase.
2. reverse transcriptase.
3. DNA polymerase.
4. DNA gyrase.

8. HIV's evolution is ...

1. shortsighted because it results in the evolution of the host.
2. shortsighted because it does not have a purpose.
3. shortsighted because it encompasses high mutation rates.
4. shortsighted because it does not look for the future of the host (it kills the host).

9. The trend in HIV infections worldwide is currently ...

1. stable.
2. increasing.
3. there are now new HIV infections since 1987.
4. decreasing.