Most herbivorous animals do not have the ability to digest the cellulose in plants. What mechanism has evolved in the absence of this ability that allows them to survive despite eating only plant matter?
A) production of saliva containing amylase
B) digestion by symbiotic microorganisms
C) avoidance of plants containing cellulose
D) converting cellulose to other carbohydrates in the animal's own cells
Answer: B
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Organisms
A. may be classified in four domains. B. may be classified in three domains. C. probably do not have a common ancestor. D. have never shared genes between domains. E. may be classified in three domains, probably do not have a common ancestor, AND have never shared genes between domains.
A hormone used by competitive athletes to increase the oxygen-carrying capacity of their blood is
_____________. A. oxytocin D. norepinephrine B. glucagon E. serotonin C. erythropoietin
Dr. Smith has discovered a bird that he believes is a new species. Dr. Wilson says he will only be convinced if Dr. Smith finds several more birds of the same type. Why might Dr. Wilson feel this way?
A) He wants to be sure Dr. Smith hasn't killed the last one and made the species extinct. B) He wants to be sure that the bird Dr. Smith found isn't just an unusual example of an already-described species. C) He wants to make sure that there will be enough specimens for many scientists to study the bird and see if it is a new species. D) All the bird species have already been described, so there can't be anymore.
Which of the following is not a difference between prokaryotic and eukaryotic gene expression?
A. In prokaryotes, transcription and translation can be done simultaneously. B. Eukaryotic mRNAs are extensively processed before translation. C. Prokaryotic mRNAs have very short half-lives. D. Bacterial mRNAs contain no untranslated regions. E. Prokaryotic mRNAs may be polycistronic.