Which human activity most directly causes a significant increase in the amount of carbon dioxide in the atmosphere?*

An immune response is primarily due to the body’s white blood cells recognizing*

In an effort to reduce the number of deaths due to malaria, scientists have successfully introduced a gene into mosquitoes. The gene makes the mosquitoes unable to support the development of the parasite that causes malaria. The technique used to produce this new variety of mosquito is most likely*

The organic compounds that scientists use to cut, copy, and move segments of DNA are*

Which statement most accurately predicts the result of interfering with populations in the web?*

A factor not shown in the diagram that provides energy for living organisms is*

Scientists have found a gene that makes a protein called PKG that controls certain behaviors in many types of ants. The soldier ant will help collect food when it has a low level of PKG. When it has a high level of PKG, the soldier ant will protect and defend its colony. Soldier ants that are given PKG are more likely to ignore food sources and attack intruders. Which conclusion can best be made from this information?*

Genetic researchers have discovered a number of different gene mutations that have led to the development of cancer. These mutations affect how frequently a cell reproduces. Which process would be directly influenced by these mutations?*

Lobsters are crustaceans related to crayfish, crabs, and shrimp. Most lobsters are a reddish- brown color, but on rare occasions, they can be orange, blue, or even multicolored. These color differences can be caused by*

Which two factors could lead to the evolution of a species over time?*

As human red blood cells mature, they lose their nuclei. As a result of this loss, which process would be impossible for mature red blood cells to carry out?*

To clone a mammal, a cloned embryo is often put into an adult female of the same species to continue internal development. The structure in which the embryo will develop is the*

Nuclear power plants, which produce electrical energy, use large quantities of water for cooling. Often, small fish, larvae, and fish eggs are sucked in along with the cooling water and destroyed. This example illustrates how*

Acid rain is a major problem in the Adirondack Mountains. Evidence that acid rain negatively affected the Adirondack ecosystem is that*

Which system in a multicellular organism functions most like the cytoplasm in a single- celled organism?*