How do some cells become brain cells and others become skin cells, when the DNA in ALL the cells is exactly the same. In other words, if the instructions are exactly the same, how does one cell become a brain cell and another a skin cell?

Muscles with fibers that run parallel to the long axis of the body are called

Describe what is happening in your cardiovascular system when you are increasing blood flow?

Lipids are chemically most similar to: carbohydrates nucleic acids proteins amino acids

Which of the following allows nutrients and other substances to be transported across the cell membrane? a. Carbohydratesb. Proteinc. Fatsd. Glucose

How are limestones and shells connected to the carbon cycle

Which of the following is a characteristic that could be applied to both living and nonliving things

What is wrong with the cellular respiration equation?

What is involved in the synthesis of a new molecule?

As rescuers in a population becomes less available. the population

A mutation that results in a single amino acid substitution in the active site of an enzyme A) may alter the ability of a noncompetitive inhibitor to bind to the enzyme. B) may alter the ability of an allosteric regulator to alter enzyme activity.