input with options: Q: The mass of atoms is based on the number of protons and neutrons in what? A:
OPTIONS:
- electrons
- molecules
- components
- nucleus
output: nucleus

Q: Q: What number is the sum of the numbers of protons and neutrons present in the nucleus of an atom? A:

OPTIONS:
- nuclear number
- combined number
- mass total
- mass number

A: mass number

input: OPTIONS:
- typical elements
- noble gases
- reactive elements
- native elements Now, answer this question: Q: What do you call elements that contain only atoms of one type of element? A:
A:
output: native elements

Q: What part of a person with myopia is longer than normal? A:

OPTIONS:
- arm
- leg
- neck
- eye

Answer: eye

Problem: OPTIONS:
- nono particle
- kilocalorie
- xerophyte
- radiostope
Q: Q: What is another name for a radioactive isotope? A:
Answer: radiostope

Q: The polymerase chain reaction is a way of making copies of what? A:

OPTIONS:
- an enzyme
- a method
- a form
- a gene

Answer:
a gene