Which of the following is exclusively controlled by ATP and ADP levels?

Urea is the principal nitrogenous waste product in our urine. Where does the urea come from?

You develop a pesticide to kill weeds that prevents the guard cells from functioning properly. The pesticide has:

Most plants appear green because of the presence of __________.

Proteases break down small proteins in the small intestine into amino acids. Which of the following in the diagram below would represent a protease?  

Who am I? I am an early Roman, an early and exemplary dictator. I took up the dictatorship when the Romans were being attacked by neighboring Italic tribes. When senate representatives came to inform me of my election, I was busy working on my small farm. I used the powers granted to me by the dictatorship to punish a man who prosecuted my son for murder.

At the end of the citric acid cycle, the glucose molecule has been completely ___________.

Which of the following statements regarding heat is true?

You treat a plant with a chemical that destroys all of the plant’s mesophyll. As a result, the plant can no longer produce _________.

Chemical reactions that use energy and release energy are collectively known as _______.