Nematocysts are found only in
a. cnidarians.
b. nematodes.
c. crustaceans.
d. echinoderms.
e. sponges.
Answer: a
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An acoelomate is an animal that:
A. has a coelom B. has a pseudocoelom C. has both a coelom and a pseudocoelom D. has neither a coelom nor a pseudocoelom E. has a coelom during early development but later loses it
Phosphorus is an essential nutrient for plants and animals. Phosphorus normally occurs in nature as part of a phosphate ion (PO4)3. Unlike many other biogeochemical cycles, the _____________ does/do not play a significant role in the movement of phosphorus.
Fill in the blank(s) with the appropriate word(s).
An intron is a section of an RNA that gets spliced out
Indicate whether the statement is true or false
Give the sex-chromosome constitution (X and Y chromosomes) and possible genotypes of offspring resulting from a cross between a white-eyed female (Xw XwY) and a wild-type male (normal chromosome complement) in Drosophila melanogaster
Include all zygotic combinations whether viable or unviable.