Passive diffusion
A. is the process by which molecules move from an area of low concentration to an area of high concentration.
B. is a spontaneous process.
C. requires the presence of a transmembrane protein.
D. Occursonly when the membrane is permeable to the solute.
E. requires energy.
B. is a spontaneous process.
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Which of the following statements best describes the habitats of Acidovorax, Sphingobacterium, and Sphingomonas?
a. Habitats are limited to the upper respira-tory tract of various mammals. b. Habitats are unknown. c. Habitats are limited to the soil and water environment. d. Habitats are limited mostly to water sources.
Answer the following statements true (T) or false (F)
1. A consequence of the tendency of the human to gain excess weight is an increased risk of developing high blood pressure, diabetes, cancer, and heart disease. 2. During hibernation, a bear would be expected to be in the postabsorptive state in terms of nutrient utilization. 3. Triglycerides do not need to be chemically altered or broken down to cross the intestinal epithelium. 4. Animals have the ability to generate glucose from proteins during prolonged postabsorptive states.
Which of the following is not found in DNA?
a. amino acids c. nucleotides b. sugars d. phosphate groups
What is the significance of having specialized epithelium and smooth muscle in the urinary bladder?
a. It helps reabsorb water. b. It helps reabsorb salts. c. It permits the diffusion of gases. d. It is capable of shrinkage and stretching. e. It protects the bladder from nitrogenous wastes.