Plasma membrane permeability of which of the following ions is most important in generating the resting membrane potential?
A) sodium ions
B) potassium ions
C) chloride ions
D) calcium ions
E) None of the above generates resting membrane potential.
Answer: B
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The excretory organs of different organisms are extremely varied. What do all excretory organs have in common?
A. a filtration system that results in a filtrate that is more concentrated than the body fluids B. a filtration system that filters nitrogenous waste from the body fluids C. a filtration system that relies on active transport to alter initial osmolarity of the filtrate D. a filtration system that relies on extensive tubules with high surface area-to- volume ratio to remove wastes
Which of the following organisms is part of the normal flora of the skin, nose, throat, and intestines of humans, and is also a leading cause of bacterial disease?
a. Propionibacterium acnes b. Corynebacterium diphtheriae c. Staphylococcus aureus d. Staphylococcus epidermidis
What type of cells keep neurons positioned where they should be, and provide them with metabolic support?
a. other neurons b. loose connective tissue c. neuroglia d. fibroblasts and their collagen secretions e. simple cuboidal epithelium
Which type of survivorship curve is pictured here for Dall sheep?
a. type II b. logistic c. type I d. exponential e. type III