The spirochete of relapsing fever changes cell surface antigens many times in order to avoid destruction by the immune response.
Answer the following statement true (T) or false (F)
True
You might also like to view...
The cluster of capillaries in a Bowman’s capsule is called the ____
a. loop of Henle b. glomerulus c. distal tubule d. proximal tubule e. afferent vessel
The ____ fungi rely on extracellular digestion
and absorption of energy-rich substances from living organisms. a. chemosynthetic b. saprobic c. parasitic d. plasmodial e. autotrophic
The hypothalamus and pituitary link the activities of the endocrine system and nervous system by
a. neurohormones being secreted in response to the summation of neural messages that enter the hypothalamus. b. shifts in hormonal concentrations being detected by the anterior pituitary. c. pheromones being secreted as a response to photoperiodic stimuli. d. the nervous tissue of the anterior lobe of the pituitary sending stimuli to the glandular tissue of the posterior pituitary to produce hormones that will be secreted by the hypothalamus. e. direct neural connections.
Which hormone stimulates both leaf abscission and fruit ripening?
a. abscisic acid b. auxin c. cytokinin d. ethylene e. gibberellin