Tutor profile: Isabel B.
Subject: Public Health
What is the difference between primary and secondary prevention methods? Give an example of each.
Primary prevention occurs before the disease actually occurs, which helps to limit risk factors of a condition or disease. An example of this is vaccination. Secondary prevention occurs while an individual has a disease or condition, typically while they are asymptomatic. Examples of this are screenings and treatments such as mammograms.
The process of DNA replication is semi-conservative, bidirectional, and semi-discontinuous. What do each of these descriptions mean?
DNA replication is described as semi-conservative because the process includes one original strand of DNA and one newly synthesized strand. It is also bidirectional because DNA synthesis can happen in two directions. Lastly, it is semi-discontinuous because the lagging strand of DNA is synthesized into okazaki fragments, which need to later be linked by the enzyme DNA ligase.
A patient is experiencing pain in their upper leg and is unable to flex their hip/thigh or knee/leg. Which muscle has been affected, and which nerve is it innervated by?
The affected muscle is the sartorius muscle of the anterior thigh muscle group. This muscle is the only one of its group that flexes the knee/leg, all other anterior thigh muscles are extensors. Each of these muscles, including the sartorius muscle, is innervated by the femoral nerve.