What is the molecular basis of touch sensation?
A. Cell membrane distortion opens touch receptors, creating a receptor potential.
B. Pressure damages the delicate strands of skin cell DNA, activating a complex signalling cascade.
C. Pressure on the skin squeezes out chemical signals from epidermal glands.
D. Pressure on sensory axons bursts vesicles and causes neurotransmitter release.
Answer: A
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Answer the following statements true (T) or false (F)
1. The root hairs develop in the zone of elongation. 2. The direction in which a plant cell expands depends on the arrangement of cellulose microfibrils in its cell wall. 3. Flowers develop as a result of determinate shoot growth. 4. The expression "one bad apple spoils the whole bunch" probably has to do with the action of ethylene on fruit ripening.
A squirrel is born and raised in captivity. Once released into the wild, it immediately begins to bury
nuts. This is an example of: a. direct fitness. b. learning. c. proximate causes. d. ultimate causes. e. habituation
Which statement about viruses is FALSE?
a. Viruses are not cellular. b. Viruses can manufacture proteins. c. Viruses cannot carry on metabolic activities. d. Viruses can only replicate by infecting other cells. e. Viruses have a protective protein coat called a capsid.
Describe the five main types of connecting neurons in the retina and their functions. What will be an ideal response?