Invertebrates, such as the flatworm, have groups of neurons with a common function. These nerve
clusters are called
a. nerve cords.
b. ganglia.
c. brains.
d. nerve nets.
e. radially symmetrical.
B
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Inflammation is a nonspecific defensive reaction to a tissue injury.
Answer the following statement true (T) or false (F)
Which of the following statements is true about susceptibility testing or treatment of P. aeruginosa?
a. Susceptibility testing is required to detect intrinsic resistance. b. Repeat susceptibility testing may be needed to monitor development of resis-tance. c. Susceptibility testing of isolates from cys-tic fibrosis patients following standard protocols gives reliable results. d. Treatment with a single antimicrobial agent, such as <-lactam with antipseu-domonal activity, is recommended.
You thinly slice a carrot root and place the slices on a medium containing nutrients and hormones necessary for plant growth. After a few weeks, you see that there are many little entire carrot plants growing from the root slices. The cells in the root can give rise to an entire plant because many plant cells are
A. totipotent B. unipotent C. embryonic D. pluripotent E. semipotent
In an example of embryonic induction, signals from cells in the ________ cause gastrulation
a. dorsal lip b. ectoderm c. gray crescent d. endoderm