What is true about the operation of gills in water? Check all that apply.
_____ Water can support delicate gill structures.
_____ Most bony fish actively pump water over their gills.
_____ Keeping membranes moist does not require a separate mechanism.
_____ Water carries more oxygen than air, so gills must be more efficient than lungs.
_____ Gills have evolved many times.
_____ Gills take different forms in different animals.
__X__ Water can support delicate gill structures.
__X__ Most bony fish actively pump water over their gills.
__X__ Keeping membranes moist does not require a separate mechanism.
_____ Water carries more oxygen than air, so gills must be more efficient than lungs.
__X__ Gills have evolved many times.
__X__ Gills take different forms in different animals.
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In an isolated population of fruit flies, 4 percent of the individuals have pink eyes, a homozygous recessive condition,
and 96 percent have the dominant black eye phenotype. What percentage of the population are heterozygotes?
a. 32% b. 16% c. 48% d. 88% e. 4%
Why is photorespiration more likely in warm weather?
a. Plants require warm weather (at least 23?C) to drive photosynthesis. b. Plants are more likely to close their stomata in the daytime heat than at night when it is cool. c. Plants are more likely to dehydrate in warm weather, forcing them to close the stomata to conserve water; this prevents CO2 from entering the leaf. d. The rubisco enzyme is very temperature sensitive and becomes less selective in warmer temperatures, allowing it to fix O2 instead of CO2. e. Plants use up the water in their central vacuoles in warm weather inhibiting the waterrequiring light reactions; this in turn alters the activity of rubisco.
What is the name of the process of selecting a specific group of organisms from an initially heterogeneous population for future breeding purposes?
What will be an ideal response?
Within a single motor neuron, what direction does an impulse follow?
A. Dendrite ? axon ? cell body B. Axon ? dendrite ? cell body C. Dendrite ? cell body ? axon D. Cell body ? dendrite ? axon E. Cell body ? axon ? dendrite