Answer:
D. Collect a large sample number
Explanation:
With a larger sample number, that means that more people participated and gave the correct answer. If you constantly change the variable, the answer may always be the same but because of the variable you changed.
Answer:
B cells are activated when their B cell receptor (BCR) binds to either soluble or membrane bound antigen. This activates the BCR to form microclusters and trigger downstream signalling cascades.
Explanation:
Answer:
The relationship between tropic levels and energy is that tropic levels contain a certain amount of energy depending of which level they are, the lowest tropic level will have the highest amount of energy, whilst the highest tropic level will have the lowest amount of energy.
The role of the organisms in the first tropic level is to produce food since they are autotrophs, these organisms do not rely on others for food. the organisms in the second level will control the amount of primary producers and will serve as food for tertiary consumers. The role of the organisms in the third level is to get food from secondary consumers so they don't overpopulate and affect primary consumers more than they have to.
Energy availability changes at each level because of the 10 percent rule. As you go higher, only 10 percent of the energy can actually be consumed by the consumer in the next level.
<span> 1. Meningitis is an infection of meninges, the membrane that protects the brain. To prove there is an infection in the brain, you can take a specimen of cerebrospinal fluid by lumbar puncture. The sample can be examined microscopically (for the presence of bacteria and leukocyte) or chemically(by looking at the protein count).
2. Cerebrospinal fluid should be sterile so the presence of eukaryotic cells means that the patient is meninges infected by bacteria. The diagnosis probably is meningitis bacteria. The capsule indicates the bacteria is Neisseria meningitidis, make the diagnosis become meningococcal meningitis.
Meningitis could also caused by Listeria </span>monocytogenes, Haemophilus influenza, Streptococcus pneumoniae, or <span>a virus.
3. The site of infection of meningitis could be from blood or direct contact to the cerebrospinal fluid.
Direct contact needs an open wound from the skull or the vertebrae that allow the invasion. Any accident that has enough force to fracture the skull be at risk.
</span>Bacteria can spread from blood in case of sepsis. Immunocompromised patient has a higher risk. Children, incomplete vaccination and living in high-density community also increase the risk.