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If a polypeptide contains 9 amino acids how many peptide bonds does it contain?

[a] – possible solution, sometimes called an educated guess.

Levels of Organization: List the levels in order (from the highest to the lowest)   (highest level) [a] organ system [b] [c] [d] [e] [f] (lowest level) [g]

Which of the following would NOT be a component of the plasma membrane?

Levels of Organization: List the levels in order (from the lowest to the highest)   (lowest level) atom [a] [b] [c] [d] [e] [f] (highest level) [g]

The DNA molecule is like a twisted ladder. What molecules form the “sides” of the DNA ladder?

In an equilibrium reaction (more than 1 correct answer; click on all that apply)

The thymus is a component of both the endocrine and lymphatic systems.

Levels of Organization: List the levels in order (from the lowest to the highest)   (lowest level) [a] [b] organelle [c] [d] [e] [f] (highest level) [g]

Molecules with two fatty acid chains and a phosphate group that form biological membranes are called