Life forms exhibit both unity and diversity. Which of the following best demonstrates the unity among all organisms?
A. The three domains of life.
B. Emergent properties.
C. Amino acids are the building blocks of proteins.
D. Natural selection.
Answer: C. Amino acids are the building blocks of proteins.
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A waxy cuticle prevents desiccation. What is the cost of this adaptation?
A. Lowered light absorption B. Reduced gas permeability C. Slower H2O transport D. Increased exposure to damaging UV radiation E. Increased susceptibility to pathogenic infection
Contrary to popular belief, stress is not usually the primary cause of ulcers, and many patients with ulcers do not over-produce acid. What Nobel prize-winning discovery demonstrated a previously unknown cause of ulcers?
A. the existence of a bacterial infection in the stomachs of most patients with ulcers B. genetically predetermined weakness in the walls of the intestinal tract C. the eroding effect of certain spicy foods on the lining of the esophagus D. greater acid concentrations in the stomach, lower esophagus, and duodenum
Zacchias has been in a horrible fire, and 50% of the total surface of his skin has been destroyed. Given the information in this chapter, why is it so important to replace the burned skin, and what is his best specific option for replacement?
What will be an ideal response?
A skeletal muscle deprived of adequate ATP supplies will _____
A) immediately relax B) enter a state where actin and myosin are unable to separate C) fire many more action potentials than usual and enter a state of "rigor" D) sequester all free calcium ions into the sarcoplasmic reticulum