The graph shows how the activity of an enzyme changes at different substrate concentrations. In the area marked “A” on the graph, many of the enzyme molecules have active sites that are Captionless Image
Available for substrate binding
Occupied by molecules
Damaged
No longer working

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?