A pathogen is always

a. a bacterium

b. a protist

c. a disease-causing agent

d. a virus

The "rate of absorption": A. Has to do with how quickly alcohol enters the bloodstream B. Has to do with how quickly alcohol is processed by the kidneys.

Which statement is part of the cell theory? A. Cells are composed of organic molecules. B. Cells have DNA as their genetic material. C. Cells have cytoplasm surrounded by a membrane. D. Cells come from pre-existing cells.

Which statement is true about microevolution? It's evolution within a single population. It's evolution of small organisms. It's evolution within small populations.

Why isn't coal considered a mineral?

What is a limitation of using a ball-and-stick model for DNA? a) Some kinds of atoms that are found in DNA must be left out of the models. b) DNA has so many atoms that the size and cost of a model could be too great.

What gives each amino acid its unique properties? its side group, its amino group, its carboxyl group, it sequence

In Mendel's experiment with round - and wrinkled-seed plants, the F1 plants, which produced only round seeds, were grown up andmatured and were allowed to self-fertilize. What was the ratio of round to wrinkled seeds in the F2 generation?

What are idea models designed to do? What is one drawback of using idea models?

Which scientific tool would be most useful for collecting organisms that live in a stream

An increase in the popularity of corn ethanol as a fuel increases the demand for corn around the world, causing the price to rise __.