What do neutrons and protons have in common?

they both have less mass than electrons.
they both are found in the nucleus.
they both move around in a cloud.
they both have the same charge.

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

The first amino acid of a new polypeptide chain is

Which of the following determines the specificity of a dna probe? a. type of radiation b. level of enzymatic activity c. number of neutrons d. complementary base pairing