Adult humans synthesize large amounts of ATP in the course of a day, but their body weights do not change significantly. In the same time period, the structures and compositions of their bodies also do not change appreciably. Explain this apparent contradiction.

Predict: Which of the following will the sun eventually become: a white dwarf, neutron star, or a black hole? Explain your answer.

What are carbohydrates used for?

What are the end products of photosynthesis? Be sure to name the by-products as well.

Which of these best describes a virus?

1. The smallest bacteria known

2. A noncellular living organism

3. A nonliving complex of RNA or DNA protected by a protein coat

What is an invasive species?

Would you expect the biosynthesis of a protein from the constituent amino acids in an organism to be an exergonic or endergonic process? Give the reason for your answer.

Would you expect the production of sugars by plants in photosynthesis to be an exergonic or endergonic process? Give the reason for your answer.

Comment on the statement that the existence of life is a violation of the second law of thermodynamics, adding concepts from this chapter to those we saw in earlier chapter.

What do the following indicators tell you about whether a reaction can proceed as written?

(a) The standard free-energy change is positive.

(b) The free-energy change is positive.

(c) The reaction is exergonic.

Organize the following words into two related groups: catabolism, energy-requiring, reductive, anabolism, oxidative, energyyielding.

Is there a connection between the free-energy change for a reaction and its equilibrium constant? If there is a connection, what is it?

Julio cuenta lo que le pasó en el centro. Usando una expresión con dar(se) o acabar, exprese lo mismo que dice Julio.

EJEMPLO: Yo paseaba por la Avenida Juárez. Yo daba un paseo por la Avenida Juárez.

Él había dejado a Gloria en la biblioteca hacía un momento.

Complete el siguiente diálogo, usando la forma correcta del verbo reflexivo.

LUISA: ¿Te falta mucho? Necesito entrar a ( ducharse).

BENITO: Espera. (Secarse) y salgo enseguida. Oye, ¿(levantarse) ya Pepe?

LUISA: No sé. Creo que (vestirse) ___________ ¿Ya estás, Benito?

BENITO: Bueno, (afeitarse) y ya estoy.

LUISA: ¿ ¿Todavia? ¿Te falta algo más?

BENITO: Pues... ¡(peinarse) y ahora mismo salgo!

LUISA: ¡Oh, no! ¿Quieres (pelearse) conmigo?