Which of the following accurately describes the way in which a muscle moves? a. no atp is needed is the contraction of a muscle. b. during contraction, cross-bridges pull the myosin to the center of the sarcomere. c. interaction and attachment between myosin and actin cause a muscle fiber to relax. d. when actin filaments are pulled toward the center of the sacomere, the fiber shortens.

Which of the following is an example of a tissue on the digestive system a.the stomach b.smooth muscle that lines the stomach c.nerve cells in the stomach d. enzyme molecules in the stomach

What was photo 51 with rosalind franklin?

1. environmental factors, such as ph and temperature, can affect the function of an enzyme. a. true b. false 2. which of the following is an organic molecules (ex. vitamins) that an enzyme? a. coenzyme b. product c. active site d. substrate 3. how do enzymes effect the speed of a chemical reaction? a. they speed it up b. they slow it down c. they have no effect on the speed of a reaction 4. during a chemical reaction, an enzyme is used up so that it can only be used one time. a. true b. false 5. which of the following results from a chemical reaction that is catalyzed by an enzymes? a. active site b. product c. substrate d. coenzyme