Pre-mRNA contains noncoding regions called ________.
A. exons
B. introns
C. spliceosomes
D. small nuclear ribonucleoproteins (snRNPs)
Answer: B
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What is the correct order for structures in the nervous system pathway for hearing?a: Thalamic neurons project to the auditory cortex.b: Axons project to inferior colliculi or superior olivary nucleus.c: Axons terminate in the cochlear nucleus in the brainstem.d: Axons from inferior colliculus project to the medial geniculate nucleus of the thalamus.e: Impulse travels in cochlear nerve sensory fibers.
A. b, c, d, e, a B. e, d, c, a, b C. c, b, a, d, e D. a, b, e, c, d E. e, c, b, d, a
What do the ductus arteriosus and the foramen ovale become at birth?
A) ligamentum arteriosum; fossa ovalis B) ligamentum teres; fossa ovalis C) fossa ovalis; ligamentum arteriosum D) ligamentum arteriosum; ligamentum teres
Manganese ions block the calcium channels in the cardiac muscle membrane. How would the presence of manganese in the extracellular fluid affect the contraction of the heart muscle?
A) The refractory period would be shorter. B) The plateau phase of contraction would be longer. C) The contraction phase would be prolonged. D) The heart rate would increase. E) The heart would beat less forcefully.
What hormone stimulates gluconeogenesis?
a. aldosterone b. testosterone c. estrogen d. cortisol e. angiotensin