A substance that helps to maintain a stable pH is a(n) ________.

Molecules that are polar and attracted to water are ________; molecules that are nonpolar and therefore not attracted to water are hydrophobic.  

Which one of the following statements is TRUE regarding the structure of the atom? Select all that apply.

What type of bacterial shape is 1?

Goblet cells, which line the inside of the trachea (wind pipe), are critical for moving foreign substances away from the lungs and out of the body because they  

Which of the following pigments is most likely the yellow one extracted via chromatography?

Which one of the following lists the bones of the arm from the shoulder joint to the fingertips?

Which one of the following vitamins can be produced by the skin to help calcium absorption?

You are studying matter and the energy that causes matter to combine, break apart, and recombine in everything living and nonliving. Which one of the following is the study you are doing?

We’ve talked about homeostasis in class with multiple examples. Choose your example and explain what it is and how it works in our body.