Which molecule results from the process of fermentation?
A) ADP
B) NADPH
C) NADH
D) NAD+
D
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What type of species, if removed from the community, could lead to the collapse of the entire community?
A. Invasive species B. Indicator species C. Keystone species D. Flagship species
Which of the following statements about nucleotides is (are) true?
A) A nucleotide contains a nitrogenous base. B) A nucleotide contains a pentose. C) A nucleotide contains a phosphate group. D) All of the above statements are true.
The situation in which an active regulatory protein "turns off" gene expression is an example of
A) a mutation. B) positive control. C) negative control. D) constitutive gene elements. E) unique regulation.
Scientists estimate that rain forests account for over half of the world's plant and animal species. Yet there is a concern that tropical rain forests are disappearing at an alarming rate. How has the disappearance of tropical rain forests changed in recent years?
A. In recent decades, tropical deforestation has not only slowed significantly, but also reversed as governments have established reforestation policies to replace lost forests. B. In recent decades, deforestation has declined significantly throughout the world and is now concentrated mainly in tropical regions. C. As tropical forests have declined, the rate at which these forests are cleared is accelerating everywhere in the world. D. In some countries, such as Brazil, the rate of deforestation has declined over the last several decades. However, even at the current rate, tropical rain forests could be completely eliminated from Earth within 25 years.