The attachment of methyl radicals to genes helps regulate which property? OPTIONS:
- information genes store
- mode of gene inheritance
- gene expression
- gene coding system
A: gene coding system

Which phrase does not describe asexual reproduction in organisms? OPTIONS:
- requires two parents
- little variation in offspring
- only one type of cell involved
- duplicates its genetic material
A: requires two parents

The average rainfall in Nevada is about 7 inches per year. The most likely reason for the low amount of rainfall is the OPTIONS:
- high elevations of deserts.
- location north of the equator.
- lack of moisture in the air.
- great distance from the ocean.
A: lack of moisture in the air.

Which of the following is least likely to change from a solid state to a liquid state when heat is applied? OPTIONS:
- butter
- paper
- ice
- candle wax
A:
paper