In marine sticklebacks, the Pitx1 gene is ____, but in freshwater sticklebacks, the Pitx1 gene is ____
a. not expressed and spines are present; expressed and spines are absent
b. not expressed and spines are absent; expressed and spines are present
c. expressed and spines are present; not expressed and spines are absent
d. expressed and spines are absent; not expressed and spines are present
e. present so spines develop; absent so spines do not develop
ANSWER: c
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a. a prolate b. a complex c. an icosahedral d. a helical e. an enveloped
In what ways are bacteria beneficial to humans?
What will be an ideal response?
Energy harvested from organic molecules is contained in the _________
_Fill in the blank(s) with the appropriate word(s).
Where in a sperm are mitochondria found?
a. the head b. the midpiece c. the tail d. both the tail and the midpiece e. in all parts of the sperm