Biology 12 Chapter 16 - Support and Movements - 20

Biology 12 Chapter 16 - Support and Movements - 20

1. What is the composition of thin filament?
Tropomyosin
All of these
Troponin
Actin and calcium ions

2. How many actin filaments surrounded a myosin filament on each end?
Six
Nine
Five
Seven

3. Where are cross bridges formed?
Between thick and thin filaments during contraction
Between two thick filaments during contaction
All of above
Between two thin filaments during contraction

4. Who gives the hypothesis of muscle contraction?
J. Waston
Morgan
A.F. Huxley
H. Huxley and A.F. Huxley

5. The hypothesis of muscle contration is called?
Sliding cross model
Skeletal muscles working model
Sliding filament model
Cross bridges model

6. In which of the following year sliding filament model suggested?
1953
1954
1955
1952

7. What is Correct about Sliding filament model?
All of these
H-zone disappears
Z-line is brought close together
I-band shortens

8. From where muscle cell get ATP to controlled a bridges?
Mitochondria
Stroma
Ribosomes
Cytoplasm

9. Which is Correct statement about rigor mortis?
Occurs after death
All of these
ATP in the body falls
Body become stiff

10. Which help to initiate muscle contraction?
ATP molecules
Nerve impulse
Histones protein
Myo-Globulin

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