What is the molecular basis of touch sensation?  

A.  Pressure on the skin squeezes out chemical signals from epidermal glands.
B.  Cell membrane distortion opens touch receptors, creating a receptor potential.
C.  Pressure damages the delicate strands of skin cell DNA, activating a complex signalling cascade.
D.  Pressure on sensory axons bursts vesicles and causes neurotransmitter release.


B.  Cell membrane distortion opens touch receptors, creating a receptor potential.

Biology & Microbiology

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An invertebrate statocyst contains ____, which surround movable ____; changes in body position move the latter,

triggering action potentials.

a. statoliths; sensory hair cells b. sensory hair cells; statoliths c. otoliths; sensory hair cells

d. efferent neurons; otoliths e. efferent neurons; statoliths

Biology & Microbiology

Engelmann's experiment demonstrated that ________

a. bacteria seek specific colors of light when cooled below certain temperatures b. plant cells produce different amounts of oxygen when illuminated by different colors of light c. green light is the most effective at promoting plant growth in greenhouses d. photosynthetic bacterial cells seek specific colors of light for optimum ATP production

Biology & Microbiology

Which of the following is associated with the increased incidence of Lyme disease?

A) decreased tick population B) decreased deer population C) decreased white-footed mouse population D) decreased forest patch size

Biology & Microbiology

Which of the following best described the surfaces of clay particles in soil?

a. They often bear positively charged ions. b. They release water to plants easily. c. They often bear negatively charged ions. d. They are generally hydrophobic.

Biology & Microbiology