Below is the structure of leucine, an amino acid. What type of functional group is the arrow pointing to (please note the arrow is pointing to the entire NH2 region)?   

Household ammonia has a pH of 12; household bleach has a pH of 13. Which of the following statements about these substances is true?

As ice melts

Which of the following is a trace element in the human body?

Which of the following organisms contain the polysaccharide chitin?

Lactose intolerance

The molecular formula of most monosaccharides represents a multiple of

Which sequence is not a correct pathway of energy through an ecosystem?

If you eat a hamburger, you are mainly eating ground-up beef muscle. What levels of organization are represented in this ground-up muscle?

________ are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules.