The type of system depicted in the accompanying figure:a
can be found in arthropods.
b. can be found in cephalopods.
c. can be found in annelids.
d. has hemoglobin as the oxygen transporting pigment.
e. can be found in arthropods and annelids.
a
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In angiosperms, the megasporangium goes through several stages as it develops into an embryo sac. The sac protects the egg cell and several supporting cells, but it does not completely enclose it. What is the opening in the embryo sac that allows the pollen tube to enter called?
a. integument b. microspore c. micropyle d. exine
Which of the following is not associated with mass extinctions?
a. After mass extinctions new species evolve to replace others. b. Mass extinctions do not affect species randomly. c. Species living in isolated areas are more susceptible to extinction. d. Mass extinctions take place over a very long geologic period of time. e. Although new species may evolve, it will take millions of years to replace the losses of a mass extinction.
Explain how transcriptional control by the NrpR protein of the archaeon Methanococcus maripaludis is similar to transcriptional control in bacteria. It is known that 2-oxoglutarate (2OG) is used by cells as an indicator of nitrogen deficiency
Based on what you know about effector molecules in bacterial operons, how would 2OG behave in M. maripaludis (as an inducer, a corepressor, etc.) and what effect would this molecule have on NrpR binding?
At which stage of meiosis are sister chromatids separated from each other?
a) anaphase II b) prophase I c) prophase II d) anaphase I