Goblet cell hyperplasia is associated with asthma. Based on their function, what is the likely outcome of an overabundance of goblet cells?
A. decreased CO2 absorption
B. excess mucus production
C. decreased mucus production
D. excess O2 absorption
Answer: B
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Life history adaptations of ___________ populations are characterized by an early age of first reproduction and short maturation time and life span.
A. r-selected B. K-selected
Which of the following statements is false?
a. Sensory receptors are structured to detect specific stimuli. b. Sensation is an awareness of a change in external or internal conditions. c. A stimulus will generate impulses that are different depending on where the signals are sent in the brain. d. Information about a stimulus is coded in the quantity and frequency of action potentials sent to the brain. e. Specific regions of the brain translate the information about the signal and convert it into a sensation.
Actin filaments may form each of the following except
A) 3D filament networks (gels). B) contractile bundles. C) branched networks. D) bundles of parallel filaments. E) axonemes containing doublet microfilaments.
After surviving a bottleneck, a population recovers to the point where it consists of as many individuals as it did prior to the bottleneck. Which of the following statements is most likely to apply to this population?
A) The postbottleneck population exhibits less genetic variation than the prebottleneck population. B) The bottleneck subjected the population to stabilizing selection. C) The postbottleneck population has less of a chance of going extinct than did the prebottleneck population. D) The postbottleneck population exhibits more genetic variation than the prebottleneck population.