This figure shows the lymphatic system. Which number indicates the inguinal lymph nodes?
A. 4
B. 10
C. 9
D. 1
E. 5
Answer: A
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The androgen-binding protein functions to:
A. confer responsiveness of certain cells to male sex hormones. B. transport androgens in the plasma. C. bind and maintain high concentrations of testosterone in the seminiferous tubules. D. transport testosterone across cell walls. E. exert negative feedback on the production of testosterone by the Leydig cells.
Homeostatic control systems and acclimatization are examples of biological adaptations
Indicate whether the statement is true or false.
The chemical cochicine, from a flowering plant, blocks the building of tubulin proteins into microtubules. This would cause cell damage by
A) reducing the production of ATP that the cell can make. B) blocking cell division. C) reducing cell transport. D) inhibiting DNA replication. E) inhibiting lipid production.
Down-regulation
a. refers to the expression of fewer receptors at the cell surface as part of a negative-feedback mechanism. b. refers to the decrease in cortisol secretion that occurs as an animal's metabolism slows down to its basal level. c. occurs in response to too little hormone reaching the target cells. d. is an idiopathic response to endocrine disrupters. e. occurs in response to the excretion of excess hormone by the kidneys.