Nerve impulses coming into the spinal cord enter via ____.
A. intervertebral disks
B. neuroglia
C. the dorsal roots
D. Broca's area
E. ventral roots
Answer: C
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The Northern Hemisphere is most tilted toward the sun in _____
a. spring b. summer c. autumn d. winter
What can be used as a molecular clock to estimate the time since organisms diverged from a common ancestor?
A. DNA B. all types of RNA C. only ribosomal RNA (rRNA) D. ATP E. All answers are correct.
A biologist uses a time machine to collect living material from 2 different time periods. Sample A is 3 billion years old and sample B is 1.5 billion years old. How would these samples differ?
A. Eukaryotic organisms would be absent from sample A. B. Eukaryotic organisms would be present in both samples but much more common in sample B. C. Prokaryotic organisms would be abundant in sample A but absent from sample B. D. Prokaryotic organisms would only occur in sample B.
In what way does caffeine affect the urinary system?
A. Caffeine increases the actions of ADH causing the proximal convoluted tubule to reabsorb less water which leads to an increased amount of urine formation. B. Caffeine blocks the actions of ADH causing the glomerular capsule to reabsorb less water which leads to an increased amount of urine formation. C. Caffeine blocks the actions of ADH causing the distal convoluted tubule and collecting duct to reabsorb urine formation. D. Caffeine increases the actions of ADH causing the distal convoluted tubule to reabsorb less water which leads to an increased amount of urine formation. E. Caffeine blocks the actions of ADH causing the proximal convoluted tubule to reabsorb more water which leads to a decreased amount of urine formation.