Which of the following does not describe the structure of DNA?

double helix

o nucleotide polymer

contains adenine guanine pairs

sugar-phosphate backbone

Scientists are currently trying to look for evidence of life on other planets, specifically Mars. One sign of life (like our own) is the presence of water.

Which type of thermometer has a constriction (narrowed passage) in the bore of the glass tube?

Explain why different types of cells are not the same.

Which is an example of a predator adaptation? a caterpillar resembling a snake an insect with camouflage like a leaf a mammal with a protective shell a bat that can locate moths by sound

What causes acid rain? A) reactions between industrial or automotive emissions and water vapor B) agricultural chemicals running off into waterways C) chlorofluorocarbons (CFCs) reacting with ultraviolet light and ozone D) a combination of smoke and

Mitosis and meiosis are methods of cell division. Which of the following is true of these two methods? A. Meiosis involves only one division, while mitosis involves two divisions. B.

What is empirical evidence and what is it not

What is a theory in biology

How might damaged alveoli affect the o2 level in the blood

The electrons of an atom occupy one or more areas of space called