How much of Earth's atmosphere is made up of nitrogen and oxygen? A. Between 25 and 75 percent B. 100 percent C. Less than 1 percent D. Close to 99 percent

In an experiment, a scientist makes a radioactively labeled probe using human DNA. She then discovers that the probe hybridizes to a small segment of DNA isolated from a plant. What can she conclude from her results? A.

A student wants to modify model 1 so that it represents an RNA double helix instead of a DNA double helix. Of the following possible changes, which would be most effective in making model 1 look more like RNA than DNA?

How is the solar system held together

Best description of a normal fault?

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? A. The population of predators will be uniform with no change. B. The population of predators will increase first and then decrease slowly.

In which species of animal does sebum eventually become lanolin?

What are some examples and non examples of chemical bonding?

Match the staining techniques with their purpose. A Negative stain such as India ink or Congo red. B The Gram stain C The Ziehl-Neelsen Acid-fast stain D Simple stain with a basic dye E The Schaeffer-Fulton Endospore stain Stain microbes a bright

Sandy puts a paper clip on the table and puts a magnet near the paper clip. The paper clip begins to move. What type of forces are acting on the paper clip?

Which statement is an example of absolute age? 1) Dinosaurs lived a long time ago 2) Trilobites lives before dinosaurs 3) Teachers are old 4) Dinosaurs went extinct 65.5 million years ago