BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 7, Problem 13SA
Which of the following is not produced by an animal muscle cell operating under anaerobic conditions?
| a. heat | d.
|
| b. pyruvate | e. lactate |
| c.
|
f. oxygen |
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Chapter 7 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 7 - Is the following statement true or false? Unlike...Ch. 7 - Glycolysis starts and ends in the ________. a....Ch. 7 - Which of the following pathways requires molecular...Ch. 7 - Which molecule does not form during glycolysis? a....Ch. 7 - In eukaryotes, the final reactions of aerobic...Ch. 7 - Prob. 6SACh. 7 - After the citric acid cycle reactions run...Ch. 7 - Prob. 8SACh. 7 - Prob. 9SACh. 7 - Prob. 10SA
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- Muscle contraction is the result of critical steps characterized by conformational changes to protein structures in the supramolecule. Which of the following conformational changes requires energy, i.e. ATP hydrolysis? A. Binding of calcium to tropomyosin changing its conformation and exposing a binding site in troponin B. Binding of myosin to troponin resulting in the power stroke and cross-bridge cycle of muscle contraction. C. Disruption in the binding of the myosin head to troponin preceding its release and relaxation back to its activated form. D. Binding of ATP to the myosin head bound to troponin.arrow_forwardIn muscle cells, myosin molecules continue moving along actin molecules as long as: A. ATP is present and intracellular Ca2+ is high. B. ADP is present and intracellular acetylcholine is high. C. ATP is present and troponin is not bound to Ca2+. D.ATP is present and intracellular Ca2+ is low. E. ADP is present and tropomyosin is released from intracellular stores. QUESTION 27 Lamellipodia and filopodia frequently occur near the edges of cells. These membrane features: A. are supported by intermediate filaments, such as keratin. B. result from the polymerization of actin filaments. C. result from the contraction of actin-myosin. D. probably do not serve any useful purpose to the cell. E. are directly linked to the microtubule organizing center. QUESTION 28 Sort the following events to reflect the sequence during smooth muscle contraction upon delivery of muscle stimu 3. Activation of the myosin light-chain kinase 5. Interaction of myosin head with actin 4. Phosphorylation of myosin 1.…arrow_forwardIn the presence of high ratio of NADH/NAD in a muscle cell glucose will continue towards which metabolic pathway: a. Formation of lactic acid b. Formation of acetyl CoA c. Storage of glycogen d. Production of 34 ATP + H20 and CO2 e. Krebs cyclearrow_forward
- Which of the following statements about skeletal muscle is CORRECT? Select one: a. An increase in Na+ concentration in the cytosol starts muscle filament sliding. b. The muscle is non-striated and involuntary. c. The muscle is involved in shivering thermogenesis. d. The muscle contracts in response to parasympathetic stimulation. e. The muscle contracts in response to hormones.arrow_forwardWhich of these conditions would you expect to find within the legmuscle fibers of a world-class marathon runner?a. myoglobin-poor c. primarily anaerobicb. contract very quickly d. numerous mitochondriaarrow_forwardWhich of the following statements is (are) accurate about aerobic and anaerobic respiration?a. Aerobic respiration is best for sprints.b. Anaerobic respiration is best for long distances because it does not need large amounts of oxygen.c. Aerobic respiration is faster.d. Aerobic respiration produces more energy per glucose molecule.e. Both aerobic respiration and anaerobic respiration start with glycolysis.arrow_forward
- Mark the following statements as true or false. If a statement is false, correct it to make a true statement. a. Stored ATP and creatine phosphate are immediate energy sources for muscle fibers. b. Glycolytic catabolism occurs in the mitochondria and requires oxygen. c. Glycolytic catabolism provides enough ATP to fuel from several minutes to a few hours of activity. d. Oxidative catabolism may oxidize the products of glycolysis, fatty acids, and amino acidsarrow_forwardWith regard to muscle contraction, which of the following is an INCORRECT statement with regard to the interactions of filaments that occur in the sarcomere? A. When muscles are relaxed tropomyosin blocks binding sites on actin subunits, which keeps cross-bridges from forming. B. The myosin heads conduct a power stroke motion to slide when bound to actin, to move the "thin" filaments towards the center of the sarcomere. C. During contraction, actin subunits are removed from the ends of the "thin" filaments to shorten actin polymers, thus reducing the length of the sarcomere. D. "Thick" filaments are anchored at the M-line, while "thin" filaments are anchored at the Z-line. E. Numerous myosin heads engage with the actin filaments simultaneously, such that there is no back-slipping during the contraction process.arrow_forwardWhich of the following best describes the DIFFERENCE between aerobic and anaerobic? A. aerobic respiration involves oxygen B. anaerobic respiration involves oxygen C. aerobic respiration occurs during glycolysis and anaerobic during the citric acid cycle and electron transport D. anaerobic respiration produces a much greater amount of ATP compared to aerobicarrow_forward
- Which of the following statements best describes the sliding filament mechanism of muscle contraction? a. Actin and myosin filaments do not shorten, but rather, slide past each other. b. Actin and myosin filaments shorten and slide past each other. c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten. d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.arrow_forwardA fatigued muscle lacks sufficient oxygen for the aerobic respiration to supply needed ATP. The accumulation of Select one: a. acetic acid occurs and contractions occur with less strength b. lactic acid (lactate) occurs and muscle cramps may set in c. pyruvate occurs and muscle cramps set in d. ethyl alcohol occurs and less frequent contractions occurarrow_forwardWhich of the following is associated with the H+ proton? a. Acts as a buffer against changes to muscle pH b. Accumulation impairs calcium handling by the sarcoplasmic reticulum (SR) c. Necessary molecule for the re-synthesis of ATP within the mitochondria d. All of the above e. Both B and C are correctarrow_forward
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