Which of the following is true of enzymes? Group of answer choices

Enzymes often work best at specific temperatures and pH ranges

Enzymes utilize an active site that is specific to a certain substrate

Enzymes are proteins

all choices are correct

Flag question: Question 19

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Identify the missing parts of the carbon cycle

What are two examples of conduction that we use everyday