Which of the following statements concerning peptide hormones is incorrect?
a. Peptides are synthesized by the endoplasmic reticulum-Golgi complex system.
b. Peptides circulate largely bound to plasma proteins.
c. Peptides bind to surface receptors of their target cells.
d. Peptides exert their effect largely by means of second-messenger systems.
e. Peptides are released by exocytosis upon appropriate stimulation.
B
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Which of the follow types of neurons are replaced throughout adult life?
A) olfactory receptor cells B) retinal bipolar cells C) retinal ganglion cells D) auditory outer and inner hair cells
The human genome consists of
A) DNA, most of which encodes protein. B) protein, most of which encodes DNA. C) protein, most of which does not encode DNA. D) DNA, most of which does not encode protein.
Until recently, acquired immunity was thought to only occur in jawed vertebrates. Which of the following observations suggest that this is NOT the case?
a. Phenoloxidase activity enables hemocytes to form an impermeable wall of melanin around an infecting pathogen. b. Invertebrate immune cells secrete an IL-1 like compound. c. Invertebrates produce lectins, which coat bacterial cells, priming them for phagocytosis. d. Copepods become resistant to tapeworms after an initial exposure. e. None of these.
The directional term that means "away from the midline of the body" is
A. lateral. B. superior. C. medial. D. inferior. E. caudal.