the guard cells take in minerals by active uptake from the cells next to them. Explain why water then passes into the guard cells.

What links together the nitrogenous bases in the center of the DNA molecule?

Describe the role of signal molecules in activating gene expression at the appropriate time

Describe the two categories used to classify physical changes

The terminal cisternae are parts of the A) myofilaments. B) sarcoplasmic reticula. C) myofibrils. D) I bands. E) sarcolemma.

The organ in the body work together like members of a pit crew servicing a race car. What other analogies can you think of to illustrate organ system working together

What can cause changes in DNA sequences? A. mutations B. genetic drift C. gene flow D. proteins

What is the definition of chemical energy

Define and give three examples of a population

Harmless bacteria are what type of bacteria? Milady chapter 5

Which kind of action is a cause of air pollution? A. Poisons are released into a major river. B. Gasoline is burned by a car engine. C. Trash is dropped in a national wildlife preserve. D. Tuna are fished to extinction.