Hair cells are important in the sense of:
a. touch
b. hearing
c. taste
d. sight
e. equilibrium
b
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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.
The number of proteins in humans
A) is approximately equal to the number of genes. B) is less than half the number of genes. C) is much greater than the number of genes.
Which of the following are associated with the process of stem nodulation?
A. Nod factors are not part of stem nodulation. B. A common bacterial species associated with stem nodulation is Bradyrhizobium. C. Bacteria enter through ruptures in the stem epidermal cells. D. All of these are associated with stem nodulation.
Mobile bits of DNA that can jump from one location on a chromosome to another location are called
A. exons. B. introns. C. pseudogenes. D. simple sequence repeats. E. transposons.