Pepsin, an enzyme found in the stomach, acts best at a ph of about 2, but it is not active at a ph of 7. why

What type of reaction occurs when chlorophyll breaks down into new substances?

How do DNA bases pair to create the full DNA molecule?

describe three adaptation you would expect In an organism that is active during the daytime and two adaptations you might Expect to find In organisms that are active at night

What is the function of a cell’s selectively permeable plasma membrane?

A chemical found in urine that is produced from breaking down of proteins is called ___. a. urea b. glucose c. folic acid d. none of the above

A change in a gene due to damage or incorrect copying is called a evolution. c. segregation. b. meiosis. d. a mutation.

The risk of injury in a car accident is much greater if occupants do not wear a seat belt. Wich of newton's laws explains why this is true? A. Law of inertia B. Law of force and acceleration. C. Law of action-reaction D. Law of gravity

Why does the United States experience winter during the months of November through early March

Simulations are useful for understanding how natural processes work but are not always representative of the real world. How does this simulation differ from what might happen in a true ecosystem?

Metamorphic rock with A handed appearance due to the alignment of minerals are