Match the type of cell junction with the best description. Answers may be used once, more than once, or not at all
1. simplest cell-cell junction
2. contributes to the blood-brain barrier
3. can be cell-matrix junctions
4. their loss is characteristic of cancer
A. gap junction
B. tight junction
C. anchoring junction
1. A. gap junction
2. B. tight junction
3. C. anchoring junction
4. C. anchoring junction
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answer the questions below:
A. Define stem cells and differentiation, and describe the different types and the extent to which they are present during the life of an individual (include the fertilized egg as well as the adult that eventually results). B. Which of the four tissue types contain populations of stem cells of known function, and what is that function? Which types of tissue have stem cells of unknown function? Do any types of tissue lack stem cells? C. How do fully differentiated cells differ from stem cells? How can stem cells be used in medical treatment? Give examples.
Which of the following are most closely involved with somatic sensory neurons?
A) proprioceptors B) interoceptors C) exteroceptors D) bipolar neurons E) visceral sensory neurons
Presynaptic neurons release neurotransmitters by ______________
A) active transport. B) exocytosis. C) diffusion. D) endocytosis.
During biochemical processing, only about 50% of the energy in nutrient molecules is transferred to ATP; the other 50% of nutrient energy is immediately lost as heat
a. True b. False Indicate whether the statement is true or false