Question

1. cancer cells can be characterized as \generic\ cells that perform no specialized body function. thus cancer cells lack

a. differentiation
b. reproduction
c. responsiveness
d. both reproduction and responsiveness

1. humans have the most urgent need for a continuous supply of

a. food
b. nitrogen
c. oxygen
d. water

1. which of the following statements about nutrients is true?

a. all classes of nutrients are essential to human survival.
b. because the body cannot store any micronutrients, they need to be consumed nearly every day
c. carbohydrates, lipids and proteins are macronutrients.
d. macronutrients are vitamins and minerals.

Explanation:

1. Differentiation refers to the process by which cells become specialized in structure and function. Cancer cells are "generic" and lack this specialization, so they lack differentiation.
2. Oxygen is crucial for cellular respiration, which provides energy for the body's functions. Humans need a continuous supply of oxygen to survive. Without it, cells start to die quickly.
3. Macronutrients include carbohydrates, lipids, and proteins, which are needed in large amounts by the body. Micronutrients are vitamins and minerals needed in smaller amounts. Not all classes of nutrients are essential for survival (e.g., some non - essential amino acids). The body can store some micronutrients.

Answer:

1. a. differentiation
2. c. oxygen
3. c. Carbohydrates, lipids, and proteins are macronutrients.