Under ideal conditions, prokaryotes are capable of reproducing at a decreased rate.
a. true
b. false
b. false
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The reason that some individual hormones have so many different effects is that
a. they influence gene transcription. b. they trigger a second messenger system that produces a cascade effect. c. there are a great many different cells in different tissues that have specific receptors for the hormone. d. the hormone is carried throughout the body and only a small amount is needed to produce its effect. e. they are polar molecules.
Photosynthesis probably originated during the __________ era, and most likely used _____________ as an electron donor.
A. Proterozoic; hydrogen sulfide B. Paleozoic; water C. Proterozoic; water D. Archean; water E. Archean; hydrogen sulfide
Which of the following hormones is (are) NOT a product of the anterior lobe of the pituitary?
A. gonadotropic hormones B. thyroid-stimulating hormone C. antidiuretic hormone D. growth hormone
An organism that obtains its nutrition from dead organic matter is a:
A) saprophyte. B) phytoplankton. C) parasite. D) neophyte.