Cells can have two kinds of endoplasmic reticulum (ER): smooth ER, which has no ribosomes, and rough ER, which has ribosomes embedded in its membrane. Which of the following would be the most likely direct result if the rough endoplasmic reticulum in the cell of an organism lost all of its ribosomes?

Match each job (function) to the cell organelle (structure) that is responsible.

The diagram shown represents some events that take place in a plant cell. In which organelle would these events most likely occur?

A lab technician needs to determine whether cells in a test tube are prokaryotic or eukaryotic. The technician has several dyes she could use to stain the cells. Four of the dyes are described in the table above. Which dye could the technician use to determine whether the cells are prokaryotic or eukaryotic?

Cells may have different shapes and different amounts of organelles, depending on their function. Which features do plant cells have that animal cells lack?

Which of the chemical models shown above is an example of a carbohydrate?

Ovalbumin is a protein found in eggs. Which of the following best describes the molecular structure of ovalbumin?

What is the function of the macromolecule subunit shown above?

As food travels through the digestive system, it is exposed to a variety of pH levels. The stomach has a pH of 2 due to the presence of hydrochloric acid (HCl), and the small intestine has a pH ranging from 7 to 9. HCl converts pepsinogen into pepsin, an enzyme that digests proteins in the stomach. Which of the following most likely happens to pepsin as it enters the small intestine?

The graph below shows how the activity of an enzyme changes over a range of pH values. Which of the following conclusions can be drawn from this graph?

The diagram above illustrates a biochemical process that occurs in organisms. What is another name for the substance labeled "catalyst"?