During the clonal production of appropriate B cells, what two types of cells are produced? What are their respective functions?
What will be an ideal response?
Both plasma and memory cells are produced. These both will produce antibodies appropriate to match the antigen of the foreign cell. Plasma cells act immediately to quell the infection; the memory cells circulate for a number of years to prevent further infection.
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Prolactin stimulates mammary gland growth and development in mammals and regulates salt and water balance in freshwater fish Many scientists think that this wide range of functions indicates that prolactin _____
A) is a nonspecific hormone B) has a unique mechanism for eliciting its effects C) is an evolutionarily conserved hormone D) is derived from two separate sources E) interacts with many different receptor molecules
What key feature of chimpanzee tool use have anthropologists identified?
What will be an ideal response?
Which animal phylum has an asymmetrical body plan?
a. Cnidaria b. Ctenophora c. Echinodermata d. Porifera e. Annelida
The gray crescent region of the amphibian zygote is thought to contain:a
growth factors and developmental determinants. b. hormones and ribosomes. c. yolk and dark pigment granules. d. mitochondria and ribosomes. e. neurotransmitters and hormones