They provide half lives by radio active decay that can tell how old they are and earth also they provide analogous and and homologous structures
<span>Cenozoic Era........................</span>
Answer:
To lose its function
Explanation:
Denaturation of macromolecules such as proteinc or nucleic acid, means that they lose their quaternary structure, tertiary structure, and secondary structure under the influence of a certain factor. The factors that can lead to denaturation are external stress, strong acid or base, a concentrated inorganic salt, radiation or heat. The consequence of denaturation is loss of biological activity for example, loss of the catalytic ability of an enzyme.
Answer:A. The release of calcium ions causes myosin and actin to attach to each other.
The contraction of skeletal muscles takes place by induction of a nerve impulse, which produces a movement and the interaction of the filaments containing proteins named as actin and myosin. This interaction of filaments is regulated by proteins called tropomyosin and troponin present on the actin filaments. The motor nerve causes the depolarization of the muscle membrane sarcolemma. This triggers the sarcoplasmic reticulum to release calcium ions. This calcium binds to troponin and thus allows the tropomyosine strand on the actin filament to displace so that the part of the actin where myosine head needs to be attached remain uncovered. Binding of the actin myosine filament results in contraction.
Hence, the release of calcium ions causes myosin and actin to attach to each other causes muscle contraction.
To be honest im glad its there cause it is helpful
