Imagine you do a version of the Beadle-Tatum experiment in which you attempt to test the one-gene, one-enzyme hypothesis, but using the pathway of synthesis of amino acid Q from X (below). The reactions, in order, are catalyzed by enzymes E1-E5. X is always present in cells, and cells need Q to grow. E1 E2 ЕЗ E4 E5 X Y Z - P D Q You identify a mutant strain that doesn't grow in normal medium, but does grow in medium supplemented with Q, indicating that it has a defect in one or more enzymes in this pathway. The only other piece of data you have is that this strain is also able to grow if you supplement the medium with Z. Is this data evidence for the one gene-one enzyn hypothesis? O no, because this doesn't rule out the possibility that both Enzymes 1 and 2 are disrupted O yes, because enzymes 3, 4, and 5 are functional in the mutant O yes, because only one enzyme is disrupted by the mutation thic tollo HOu thnt como amer in the pathway are still functional
Anatomy and Physiology of Special Sensory Organs
Sensory organs can be labeled as special sensory structures that permit sight, hearing, odor, and flavor. Sensory structures permitting proprioception, touch, thermal, and pain perception can be classified as more advanced sensory organs. The sensory neurons are trained to find out modifications in the external and internal conditions so that a person's body can react to that change. A stimulus is the first signal that is recognized by any sensory receptor of the body. Stimulus is an impulse generated when there is a change in the surroundings of a person. For example, a heated environment will alert the brain through the thermal sensory organs and generate a reflex accordingly.
Sensory Receptors
The human sensory system is one of the most complex and highly evolved structures, which processes a myriad of incoming messages. This well-coordinated system helps an organism or individual to respond to external stimuli, appropriately. The sensory receptors are an important part of the sensory system. These receptors are specialized epidermal cells that respond to external environmental stimuli. These receptors consist of structural and support cells that form the peripheral unit of the receptor and the neural dendrites which receive and detect the external stimuli.
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