The spinning glands of insects that make threads and silk develop from:a
epithelial cells.
b. goblet cells.
c. osteoblasts.
d. osteoclasts.
e. sebum.
A
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Your brother has just purchased a new plastic model airplane. He places all the parts on the table in approximately the positions in which they will be located when the model is complete. His actions are analogous to which process in development?
A) morphogenesis B) determination C) induction D) differentiation E) pattern formation
ACTH (adrenocorticotropin hormone) ____
a. is secreted by the posterior pituitary b. has target cells in the autonomic nervous system c. has target cells in the adrenal glands d. has target cells in the adrenal medulla e. initiates an autoimmune response
The removal or destruction of all living organisms is called
a) sterilization. b) disinfection. c) pasteurization. d) sanitization.
In a small rodent species the C^B C^B codes for black fur, the genotype C^W C^W codes for white fur, and the genotype C^B C^W codes for gray fur. This is an example of ____________.
a. pleiotropy b. codominance c. incomplete dominance d. a sex-linked trait