Thoughts are translated into speech in (the) ________
a. primary somatosensory cortex
b. parietal lobe
c. occipital lobe
d. Broca's area
d
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Which of the following structural features is common to cellulose, chitin, and peptidoglycan?
A) They are all composed of glucose in either the ? or ? form. B) They all contain peptide bonds. C) They can all form bonds between polymer chains that create parallel strands. D) They are all composed of highly branched fibers.
The image below diagrams the action of an enzyme. Notice that the enzyme is depicted as being more tightly wrapped around the substrates in step 2 than it is in step 1. Why is this?
a. When a substrate locks into the active site of an enzyme, the enzyme changes shape to mold itself around the substrates. b. Generally, the size of a substrate is larger than the size of the active site into which it must fit. When the substrate enters the active site, the active site must stretch to fit. c. Before catalysis can occur, a substrate must change its shape so that it fits into the active site of the enzyme more precisely. d. Most active sites are only designed to hold one substrate. In this image, two substrates enter the active site, creating a tighter fit.
Unlike angiosperms, gymnosperms like pines have single instead of double fertilization, but otherwise have an identical life cycle. What structure should have the greatest difference between angiosperms and gymnosperms?
A) egg cell B) seedling C) seed D) leaf cell
During normal climatic conditions with regular rainfall, the average beak depth for a population of finches was 6.8mm. Researchers found that after a drought, average beak depth increased to 8.8mm. Birds with deep beaks (>9mm) were better able to eat large, hard seeds. Small hard seeds were also available after the drought, but could only be eaten by birds with shallow beaks (<7mm). Choose the graphical representation and term that best represents what would happen in the post-drought finch population if both types of seeds continue to be available.
A. 
balancing selection.
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B. 
stabilizing selection.
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C. 
negative frequency-dependent selection.
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D. 
disruptive (diversifying) selection.
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E. 
directional selection.
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