Which is not a stimulus that the simplest sensory receptors, free nerve endings, will respond to?
A. Bending of the sensory neuron membrane
B. Release of odorants from freshly baked bread
C. Changes in the oxygen content of the extracellular fluid
D. Stretching of the sensory neuron membrane
E. Changes in temperature
Answer: B
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The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar, yet they all differ markedly from their ancestral population in Asia. This is probably an example of _____
A. gene flow. B. sexual selection. C. directional selection. D. founder effect. E. disruptive selection.
Which of the following excretory tubule segments in mammals consumes the most ATP?
a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle
High-density lipoproteins (HDLs) deposit cholesterol on the endothelial surfaces of blood vessels and contribute to atherosclerotic plaque formation.
a. true b. false
All of the following pertain to endotoxins, except they
A. can cause shock in the human body. B. can stimulate fever in the human body. C. are specific bacterial cell wall lipids. D. are found in acid-fast bacterial cell walls. E. are involved in typhoid fever and some meningitis cases.