Given these components of a reflex:
1. association neuron
2. skeletal muscle
3. afferent neuron
4. efferent neuron
5. sensory receptor
Choose the sequence below that best represents the order followed in a reflex, from stimulus to response.
A. 5, 4, 3, 2, 1
B. 5, 3, 2, 4, 1
C. 5, 4, 3, 1, 2
D. 5, 3, 1, 4, 2
Select your answer:
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Microbiology › ViewSCID is defined by a lack of functional B and T cells which eliminates protection by humoral and cell-mediated immunity. Which of the following is true?
A. A genetic defect disrupts the development of the lymphocytic cell lines.
B. A genetic mutation renders the individual incapable of removing a toxic DNA metabolite from lymphocytes, which ultimately destroys them
C. Genes coding for B and T cell receptors are mutated so the cells are incapable of binding antigens.
D. All of the above describe cases of SCID.
Stem Cells & Cell Differentiation › View
Which is true about embryonic stem cells?
A. They no longer divide, their cell type is set and cannot change.
B. They can develop into only one type of cell.
C. They can become any cell type in the body.
D. They are found in adults.