What is represented by the part of the figure labeled as “B”?
a. normal tissue
b. cancerous tissue
c. adipose tissue
d. lymph nodes
e. red blood cells
ANSWER: b
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The reason some individual hormones have multiple effects on different target tissues is that ____
a. gene transcription is altered b. second messengers trigger cascade or amplification effects c. many different cells in different tissues have specific receptors for the hormone d. only a small amount of the hormone is required for its effect e. hormones can conform to multiple receptors
Which type of cell produces cytokines to enhance the adaptive immune response?
a. B cells b. helper T cells
c. cytotoxic T cells d. plasma cells e. memory cells
A nursing student develops a positive reaction to the tuberculin skin test. A history reveals possible exposure to patients with tuberculosis. A sputum sample is acid-fast negative. When asked for vaccination records, the student reports that childhood
vaccination records were lost when the family emigrated from a Southeast Asian country. What is the best explanation for the test results? A) The student has been infected with Mycobacterium tuberculosis. B) The student has been exposed to Mycobacterium tuberculosis. C) The student is not infected. D) The student has been exposed to Mycobacterium tuberculosis or was vaccinated with BCG vaccine. E) No conclusion is possible with the information provided.
If paedomorphosis via neotony involves the retention of juvenile traits in adults, what is responsible for pae-domorphosis via progenesis?
What will be an ideal response?