AP Biology Chapter 3 Practice Questions

Organic molecules consist mainly of ____ atoms.

• carbon

• carbon and oxygen

• carbon and hydrogen

• carbon and nitrogen

Each carbon atom can bond with as many as ____ other atom(s)

• one

• two

• three

• four

____ is a simple sugar (a monosaccharide)

• ribose

• sucrose

• starch

• all are monosaccharides

Unlike saturated fats, the fatty acid tails of unsaturated fats incorporate one or more _____.

• hydrogens

• single bonds

• double bonds

• triple bonds

Is this statement true or false? Unlike saturated fats, all unsaturated fats are beneficial to health because their fatty acid tails kink and do not pack together.

• True

• False

Which of the following is a class of molecules that encompasses all of the other molecules listed?

• triglycrides

• waxes

• lipids

• fatty acids

• steroids

____ are to proteins as ___ are to nucleic acids?

• sugars; lipids

• sugars ; proteins

• amino acids ; hydrogen bonds

• amino acids ; nucleotides

A denatured protein has lost its ____.

• hydrogen bonds

• shape

• function

• all of the above

A ____ is an example of protein secondary structure

• barrel

• polypeptide

• domain

• alpha helix

Match the molecules with the best description:

wax

• protein primary structure

• water-repellent secretions

• sugar storage in animal muscles

• richest energy source