The atmosphere contains approximately ____ percent nitrogen.
A. 2
B. 10
C. 50
D. 80
D. 80
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Why might predators take more time to recover following a disturbance than herbivores or producers?
a. Recovery time is based on the flow of energy, so herbivores recover first, then producers, and then predators b. Recovery time is based on the flow of energy, so producers recover first, then herbivores and finally predators. c. Recovery time is based on solar cycles, and thus predators are the second group to recover. d. Predators actually recover more quickly than others because of their mobility.
Why are individuals with Turner syndrome always female and individuals with Klinefelter syndrome always male?
What will be an ideal response?
How might a single base substitution in the sequence of a gene affect the amino acid sequence of a protein encoded by the gene, and why?
A) Only a single amino acid could change, because the reading frame is unaffected. B) The amino acid sequence would be substantially altered, because the reading frame would change with a single base substitution. C) All amino acids following the substitution would be affected, because the reading frame would be shifted. D) It is not possible for a single base substitution to affect protein structure, because each codon is three bases long.
Tundra is characterized by:
A) low rainfall, dry soils, and permafrost. B) low rainfall, seasonally wet soils, and permafrost. C) high rainfall, slowly growing trees, and low temperatures. D) low rainfall, deep water penetration, and trees with a vibrant understory of moss. E) low rainfall, coniferous trees, and permafrost.