Concept explainers
To differentiate: In the activity of troponin and tropomyosin in the contraction of muscles with the competitive inhibitor activity in the enzyme action.
Concept introduction: The contraction of muscle cells rely on the interactions between the thick and the thin filaments. The thick filaments are called as the myosin molecules, whereas the thin filaments are called as the actin filaments. The contraction of muscles is the result of filaments motion that is powered by a chemical energy.
The troponin complex and the tropomyosin are the regulatory proteins involved in the contraction of muscles. Competitive inhibition is a type of enzyme inhibition, where an inhibitor binds to the target molecule and prevents the binding of substrate to the enzyme.
Want to see the full answer?
Check out a sample textbook solutionChapter 50 Solutions
CAMPBELL'S BIOLOGY >IP<
- Evaluate and Synthesize 9. INTERPRET DATA Examine Figure 40-13. Based on the summation of two stimuli shown in that graph, draw a curve showing summation when the muscle fiber is stimulated three times. Figure 40-13 Summation and tetanusarrow_forwardVISUALIZE Describe the action taking place at each of the numbered steps in the figure.arrow_forwardTest Your Understanding 3. An energy storage compound that can be stockpiled in muscle cells for short-term use is (a) myoglobin (b) ADP (c) troponin (d) myosin (e) creatine phosphatearrow_forward
- Focus on the interaction of ATP with the kinase first. Would you say ATP binds on the surface of the kinase or in a cleft? What color are the phosphorus atoms? What color are the Mn2+ ions?Which part of ATP do the Mn2+ ions interact with?arrow_forwardVISUAL SKILLS During intense exercise, can a musclecell use fat as a concentrated source of chemical energy?Explain. (Review Figures 9.18 and 9.19.)arrow_forwardPredict whether creatine kinase will operate in the direction of ATP synthesis or phosphocreatine synthesis at 25°C when [ATP] = 4 mM, [ADP] = 0.15 mM, [phosphocreatine] = 2.5 mM, and [creatine] = 1 mM.arrow_forward
- Examine the network motifs in Figure Q8–5.Decide which ones are negative feedback loops and whichare positive. Explain your reasoning.arrow_forwardReflect back on the Muscle Fatigue investigation we did earlier in this Activity. Choose one of your classmate’s interpretation to one of these questions: What happened to your energy & ability to pinch the clothespin as you progressed through each trial? Why? What might cause one to be able to get more squeezes, in other words, to have less fatigue? Explain in terms of biological concepts. Suggest how the amount of ATP produced cause your muscle cells to be less efficient. When did this change in the amount of ATP produced occur in this investigation? How could you tell? Your muscles would probably recover enough after 10 minutes to operate at the original efficiency. Explain why. Show how specific details from the steps of cellular respiration add details to answer this question.arrow_forwardPls help ASAP, thanks!"Collagen is a fibrous protein which..."arrow_forward
- You’ve setup an in-vitro experiment to measure molecular motors and have an irreversibly binding ATP analogue. After conducting the experiment, you find that this irreversibly binding ATP analog stops motor function. Explain why that is the case.arrow_forward. WHAT IF? Suppose a cell’s membrane potential shiftsfrom -70 mV to -50 mV. What changes in the cell’spermeability to K+or Na+could cause such a shift?arrow_forwardMAKE CONNECTIONS How does the second lawof thermodynamics help explain the diffusion of asubstance across a membrane? (See Figure 7.10.)arrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning