Place these steps of enzyme catalysis in the correct order:
1. The substrate and enzyme change shape.
2. The substrate enters the active site.
3. The enzyme reverts to its original configuration.
4. The product is expelled.
A) 2, 1, 4, 3 B) 1, 3, 4, 2 C) 2, 3, 1, 4 D) 1, 2, 3, 4 E) 2, 1, 3, 4
A
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Penicillin is a good example of a hapten.
Answer the following statement true (T) or false (F)
Charles Darwin observed an orchid flower with very long, thin tubes that prevent many species from feeding on the flower nectar and pollinating the flower. He offered a prediction that some species of pollinators would eventually be found that can feed and pollinate through the small tube. You decide to test Charles Darwin's proposal by placing nets over some orchids that allow small pollinators to enter, but prevent the large sphinx moth from entering. You then compare the number of seeds produced by plants with and without the nets. The seed production is
A. a hypothesis. B. a standardized variable. C. a theory. D. an independent variable. E. a dependent variable.
Strictly speaking, mitosis and meiosis are divisions of the
A) cytoplasm. B) nucleus. C) nucleus and chromosomes. D) chromosomes. E) nucleus, cytoplasm, and chromosomes.
Gram-positive bacteria are characterized by the presence of:
A) an outer membrane envelope. B) thick layer of peptidoglycan. C) thin layer of peptidoglycan. D) an overall positive charge to the cell wall.