The distance from the center of the lens to its principal focus is called the:

A. scaling factor

B. magnification

C. secondary focus

D. focal length

It contains a phosphate group for every nucleotide. A. DNA B. RNA C. both DNA and RNA D. neither DNA nor RNA

Which of the following is NOT true of adaptation? adaptations account for why organisms are suited to their way of life adaptations account for why organisms can escape predators natural selection causes adaptive traits to be increasingly

The prevention of illness through vaccination occurs due to the formation of

Which fossil fuel is responsible for most of the electricity generated in the United States? A. coal B. natural gas C. propane D. petroleum

Chose the statement that best describes a molecule that would be soluble in water: A: The molecule is composed entirely of hydrogen and carbon atoms. B: The molecule contains a large majority of nonpolar covalent bonds. C: The molecule is neutral (i.

What do enzymes react with? A. the products of chemical reactions B. the active site of the plasma membrane C. proteins in the cytoplasm D. a specific substrate

Isaac watched a movie where a tsunami washed across the coastline. He related the incident to the geology of the ocean he learned at the school. Which geological phenomenon did Isaac relate to? A. plate tectonics B. upwelling C.

How do mutations affect an organism? A. they may cause the development of a disease-causing allele B. they may cause the development of a more beneficial allele C. they, in some cases, may have no noticeable affect D. all of the above

Scientists make two types of observations that can be either

Of the following muscle types, which has the longest muscle cells and has obvious stripes called striations? Of the following muscle types, which has the longest muscle cells and has obvious stripes called striations? a. cardiac muscle b.