Biology part 3

There is an effective cure for HIV/AIDS

• True

• False

Where is it believed HIV to have originated?

• Chimpanzee's

• Humans

• Civets

• Bats

How is it believed HIV was passed to humans?

• fights with chimpanzees led to blood contact

• hunting chimpanzees for their meat led to blood contact

• mosquitos passed infected chimpanzee blood to humans similar to West Nile Virus

• ticks passed infected chimpanzee blood to humans

What stage of HIV would be considered AIDS

• Stage 1

• Stage 2

• Stage 3

Which of the following is true about retroviruses?

• a retrovirus immediately incorporates its DNA into the cell using an enzyme called integrase

• a retrovirus must use an enzyme called reverse transcriptase to take its RNA and turn it into DNA and then incorporate into the cells genome

• the retrovirus uses its own RNA to incorporate immediately into the cells genome

• a retrovirus needs to use multiple enzymes such as reverse transcriptase to change RNA into DNA and then integrase to incorporate into the cells genome

Which of the following does HIV bind to?

• Erythrocytes

• somatic cells contained in the blood stream

• CD4 Helper T cells

• Leukocytes

Which statement best describes Kepler’s 2^nd Law of Planetary Motion?​

• Planets revolve around the sun over equal areas in equal time intervals.

• Planetary orbits are in the shape of an ellipse.

• A planet’s orbital period is proportionate to its distance from the sun.

Where will an object move at the greatest speed as it orbits the sun?

• Perihelion

• Aphelion

• Between perihelion and aphelion

Which of the following is the most accurate description of "escape velocity"?

• Escape velocity is the velocity needed to get away from the Earth's gravitational force.

• Escape velocity is the velocity needed to get away from the Earth's gravitational force and is dependent upon the mass of the satellite.

• Escape velocity is the velocity needed to get away from the Earth's gravitational force and not dependent upon the mass of the satellite.

• Escape velocity is the velocity needed to get away from the Earth's gravitational force and not dependent upon the mass of the satellite but is dependent upon the geometric structure of the launch vehicle.

.2 AU/year =

• 1km/sec

• 2km/sec

• 30km/sec

• 40km/sec