1. explain why bone mass is “lost in space.” make sure to mention specific bone cells in your response. do you think there is any way to fight this loss? 2. why did a decrease in bone mass lead to increased calcium levels in the blood? 3. what is osteoporosis? how can a study of what is happening to bones in space potentially prevent and treat this condition? 4. why do you think a runner will most likely develop bigger leg bones than a swimmer? how does this happen? 5. explain how the body will use bone remodeling to repair a fracture. 6. the fetal skeletal is made of cartilage and eventually turns to bone in a process called ossification. given what you know about bone cells, how do you think this occurs? 7. what lifestyle choices a person maintain healthy, strong bones and prevent bone loss? explain. 8. explain why a person who has been in a leg cast for two months will notice a significant change in size and function of the leg. how do you think muscle would be affected?

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.