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Answer:
The myosin filament or more precisely the myosin head can now bind to the actin forming the cross bridges followed by a power stroke during which actin slides over myosin.
Explanation:
The muscle contraction can be explained by sliding filament theory bu Huxley and Huxley. The two muscle proteins which take part in muscle contraction are myosin and actin.
Myosin: It is a hexameric protein. Each monomer is called meromyosin. Each meromyosin has two important parts, a globular head with a short arm and a tail. The head forms cross bridges with the actin filament. Myosin head acts as ATPase enzyme. When ATP binds, head acts as enzyme hydrolyzing the ATP to produce energy. The head also has the site for binding of actin.
Actin filament: It contains three proteins, filamentous actin, tropomyosin and troponin. Filamentous actin contains active site for myosin binding but at rest, tropmyosin covers the myosin binding site. This prevents the cross bridge formation. Tropomyosin are held in place by troponin molecules.
When calcium is available, the binding of calcium to a TpC sub-unit of troponin causes the shifting of tropomyosin-troponin complex. Now actin can attach to myosin head and slide over myosin.
The actin filaments slide over the myosin filament by the the formation of cross bridges and during this process the I-band gets reduced whereas the A band remain the same. The lengths of actin and myosin filaments remain unchanged.
Answer:
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D.<em> A formal method used to answer specific questions is Correct</em>
Explanation
In Simple terms, the scientific process is a way for scientists to study and learn things And to test new things, and Use the scientific method Steps Below
- Ask a question.
- Gather information and observe
- Make a hypothesis
- Experiment and test your hypothesis.
- Analyze your test results.
- Modify your hypothesis, if necessary.
- Present a conclusion.
- Retest
Therefore, The Answer is Option D.
Answer:
FSH, LH, and TSH all have a similar structure and are found in vertebrates and invertebrates alike. Therefore, they can be defined as HOMOLOGOUS
Explanation:
FSH, LH, and TSH are homologous because of similarities in their structure which are found across both vertebrate and invertebrate
