When calcium ions are released into muscle fibers, what happens along the actin filament? multiple choice the position of the tropomyosin threads shift, hiding myosin binding sites, causing the myosin head to move farther away from the actin filament. the position of the tropomyosin threads shift, exposing myosin binding sites, allowing the myosin head to attach to the actin filament. the position of the actin filaments shift, exposing myosin binding sites, causing the myosin head to move farther away from the tropomyosin threads. the position of the actin filaments shift, hiding myosin binding sites, allowing the myosin head to attach to the tropomyosin threads.

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

In 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? in 1959, doctors began using the powerful antibiotic methicillin to treat infections of staphylococcus aureus, but within two years, methicillin-resistant strains of s. aureus (mrsa) appeared. how did the resistant strains of s. aureus emerge? staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. these bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. over time, these resistant individuals became increasingly common. in response to treatment of staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.

Anton created a chart listing different types of materials. which best complete the chart?