Phylogenetic analyses of some vertebrate mineralcorticoid and glucocorticoid receptors and their ligands has suggested that the hormones evolved prior to their receptors.
Answer the following statement true (T) or false (F)
False
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Organisms that can grow without oxygen are called ______.
a. anoxyic b. phototrophs c. anaerobes d. cyanobacteria
A deterioration in the myelin sheaths of motor axons to the lower leg would be expected to
a. remove the restraints to ion movement and speed up impulse transmission. b. cause immobility of the leg due to cessation of impulses to leg muscles. c. slow the rate of transmission and cause lack of motor control. d. have little effect because the sheaths are for insulation only. e. cause paralysis.
Some biologists believe that life on Earth is in the midst of a sixth major mass-extinction event caused by
A) human activity. B) a gradual decrease in global temperature. C) loss of genetic diversity due to inbreeding. D) coevolution of predator and prey species. E) sustainable agriculture efforts.
The rough endoplasmic reticulum is a cell structure that consists of folded membranes that contain ribosomes. What is the advantage of the folded membranes?
A. increases surface area in order to produce more proteins B. decreases surface area in order to produce more proteins C. increases volume of the edoplasmic reticulum in order to produce more energy D. decreases volume of the endoplasmic reticulum in order to make more energy